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LabVIEW DSC 7.1 Course Manual

1. TRE Set Tag Defaults DataSocket Properties 10 Click the OK button to finish the Configuration Wizard 11 Save the SCF file and click the OK button if prompted to restart the Tag Engine 12 Close the Tag Configuration Editor National Instruments Corporation 8 31 LabVIEW DSC Module Course Manual Front Panel 13 Create a new VI and build the following front panel gt Untitled 5 Front Panel 14 Place a knob located on the Controls Numeric Controls palette on the front panel and label it Write Value 15 Place a vertical fill slide located on the Controls Numeric Controls palette on the front panel and label it Read Value 16 Place a stop button located on the Controls Buttons amp Switches palette on the front panel LabVIEW DSC Module Course Manual 8 32 ni com Block Diagram 17 Complete the block diagram as shown in the following figure 18 19 20 21 22 23 lf Untitled 5 Block Diagram ox File Edit Operate Tools Browse Window Help x be a Sn L hofa istoar o My Temp POBL Place a While Loop located on the Functions All Functions Structures palette on the block diagram and connect the stop button to the conditional terminal Place a Write Tag VI on the block diagram Right click the tag name input and select Create Constant from the shortcut menu to create a constant Select the My Temp tag Place a Read Tag VI on the block
2. NATIONAL F STRUMENTS LabVIEW Client Architecture You also can make a client using LabVIEW without using the DSC Module In this type of client you cannot use the HMI Wizard the security features or any of the other LabVIEW DSC module specific VIs such as the Trend VI However you can make connections between client controls indicators and the server tags using the front panel DataSocket The advantage of using a strictly LabVIEW client is that you can build the client using the Application Builder And you can install this application on the client machines without requiring a DSC Module run time system The disadvantage is that creating the client application becomes harder because you do not have any of the DSC Module wizards Also you cannot view historical data because Citadel is not installed without the run time system National Instruments Corporation 7 23 LabVIEW DSC Module Course Manual C Lookout Client Architecture Optional Lookout Client Machine LV DSC Module Server Machine Read Write Tags Lookout Does not require an I O Point License LOGOS Client Process Server Tag Engine LV DSC Server looks just like Citadel J VO Hardware J a Lookout server process Citadel 9 I O Hardware Lookout Client can easily access read write tags ni com NATIONAL JO STRUMENTS Lookout Client Architecture If you use both the DSC Modul
3. Alarms in LabVIEW DSC True to its nature the Alarm is a convenient way to quickly analyze your tags An Alarm evaluates the current value of the tag and can notify your VIs if they fall within certain predefined ranges National Instruments Corporation 4 13 LabVIEW DSC Module Course Manual EE Alarms Giving Meaning to Your Data e Provide a simple way to handle predefined thresholds that occur in the data from tags e Can be logged making your Citadel database more informative and complete e Can be set to monitor one tag or entire groups e Flexible and easy to alter and maintain N NATIONAL INSTRUMENTS Alarms Giving Meaning to Your Data When you are designing your own VIs using DSC there are many times when you will be interested in every point of data that is available However there also are many situations where you only care about maintaining a value within a specific range or only take steps when the data has reached a particular threshold Alarms are then the tool of choice in these situations Alarms like many other DSC components can be logged to the Citadel database This provides a way to better understand the histories of your data and interpret significant patterns You also can configure an Alarm for one tag or for an entire group allowing you to easily make changes on the fly to whole portions of your VI Groups allow your VI to remain flexible and is easier to alter and m
4. Trace View A ni com NATIONAL INSTRUMENTS Viewing Data Sets in MAX Historical data can be viewed in Measurement Automation Explorer MAX In order to do so MAX can be opened from the Windows Start Menu or by going to Tools DSC Module View Historical Data in LabVIEW Under Historical Data in MAX right click Citadel 5 Universe New Trace View Click the Add Remove button on the top of the new view window This will bring up the Add Remove Traces and Data Set Runs dialog where you can navigate to the data you want to view in the database Unless changed this will generally be under My Computer Name of database Username Computer Name LabVIEW Click the data that need to be displayed and click Add Notice that all the traces added to the trace view are listed below Click OK The Display tab in MAX will show all the traces that you have selected to be viewed Click Add Remove to add or remove traces National Instruments Corporation 4 11 LabVIEW DSC Module Course Manual Exercise 4 1 Logging and Viewing Data Sets Approximate time to complete 30 45 min Page 4 23 Explore various options available to view your logged data OBJECTIVE LabVIEW DSC Module Course Manual 4 12 ni com Alarms in LabVIEW DSC a o Allows you to generate events based on particular values of data Alarms Useful for having DSC perform basic analysis for you
5. Exercise 5 1 Logging and Viewing Data Sets Approximate time to complete 30 min Page 5 20 To set up a data set and view it using several methods OBJECTIVE National Instruments Corporation 5 9 LabVIEW DSC Module Course Manual Keeping Your Database Slim When configuring tags to be logged set the Log Deadband value to be high and set the Log Resolution to a value that will minimize memory usage e Compact your database e Reduce the Historical data lifespan ni com NATIONAL JF STRUMENTS Keeping Your Database Slim As discussed in Lesson 4 Handling and Logging Your Data Citadel logs data quite efficiently by logging data only on change Therefore when a tag value changes a certain percentage the new value is logged This is called Log Deadband If the Log Deadband is set to a small percentage smaller changes in value are considered significant More data points are logged taking up more time and hard drive space Having a high Log Resolution can slightly decrease database size A Log Resolution of 0 0 means that the exact value is stored A resolution of 0 1 is more efficient Resolution is based on the precision of logged data required for your application Backing up compressing and archiving a database regularly also is recommended to reduce the hard drive space used by databases This also prevents complete data loss upon any kind of failure Database management ca
6. IA OPC Drivers or Third Party Server t Serial Ethernet Third Party PLCs F STRUMENTS LabVIEW DSC and OPC This slide shows how the Tag Engine communicates to the OPC servers and how the OPC servers talk to the hardware The Tag Engine does not directly talk to the hardware without a driver However if new hardware is released only the driver needs to be updated Thus new DAQ boards FieldPoint modules and so on only require installation of new driver software instead of another version of the DSC Module Additionally if you had a serial FieldPoint system configured you could change to an Ethernet system and reconfigure the driver without changing the configuration of the Tag Engine LabVIEW DSC Module Course Manual 2 6 ni com Tags and Your Hardware Tag Configuration Editor TCE Provides tag setup Tag Engine Loads various groups of tags and updates tag values from hardware You can launch both these utilities and others using the Tag Utilities Toolbar by selecting Tools DSC Module Show Toolbar Administrator motor scF LabVIEW NATIONAL F STRUMENTS Tags and Your Hardware Tags are the most basic element of LabVIEW DSC Tags are directly connected to your real world measurements through OPC Servers and make the collection and management of your data much simpler DSC provides powerful utilities to enable and optimize your usage of tags in you
7. National Instruments Corporation ix LabVIEW DSC Module Course Manual Lesson 1 Datalogging and Supervisory Control DSC Module Overview TOPICS A Introduction to the DSC Module How the DSC Module Improves Your Applications Rapid Development Understanding the Data Transfer Process Setting Up FieldPoint By the end of this lesson you will be able to answer the following questions e What can the DSC Module help me accomplish e How can the DSC Module simplify my development e How can I design a simple application with the DSC Module e How does data go from my hardware to my VI with the DSC Module e Why is it important to keep my source of data abstract National Instruments Corporation 1 1 LabVIEW DSC Module Course Manual o What is the LabVIEW DSC Module Interfaces between your VI and your Hardware Designed to extend the functionality of your applications e Creates a common format for hardware access and manipulation e Made to simplify your program and your design process ni com NATIONAL JF STRUMENTS What is the DSC Module The LabVIEW Datalogging and Supervisory Control DSC Module greatly extends the functionality of LabVIEW The DSC Module integrates with LabVIEW In addition to creating applications with the DSC Module from the beginning you also can incorporate the DSC Module into existing applications The DSC Module simplifies applications and maximizes the
8. nobody 8 Runthe VI and notice the Tag values update National Instruments Corporation 7 37 LabVIEW DSC Module Course Manual Part B Create the PID Client Front Panel 1 Create the following front panel PID Client Ex 7 2 vi Front Panel E File Edit Operate Tools Browse Window Help 13pt Application Font EZ 2 Create the necessary controls and indicators a Place a vertical pointer slide located on the Controls Numeric Controls palette on the front panel b Place a square LED located on the Controls LED palette on the front panel c Place three numeric indicators located on the Controls Numeric Indicators palette on the front panel d Place a STOP button located on the Controls Buttons amp Switches palette on the front panel You will use this button later in the exercise 3 Use the HMI Wizard to make appropriate connections a Connect the vertical slider to the Setpoint tag 1 Right click the vertical slider and select HMI Wizard from the shortcut menu 2 Select Setpoint tag and click the OK button LabVIEW DSC Module Course Manual 7 38 ni com b Repeat step a for the other indicators 1 Connect the square LED to Server Running 2 Connect each of the three numeric indicators to Heat Lamp Control Cooling Fan Control aad Chamber Temperature Untitled 1 Block Diagram File Edit Operate Tools Browse Window Help m O koje resor gt t URL Cooling Fan Cont
9. End of Exercise 3 1 LabVIEW DSC Module Course Manual 3 24 ni com Exercise 3 2 Generating Code with HMI Wizard Objective To connect to LabVIEW DSC Tags and use the HMI Wizard to generate code Complete the following steps to build a VI that connects to the FieldPoint I O tags for the Temperature Chamber and uses these tags to control the fan speed and light intensity The HMI Wizard will generate code Front Panel 1 Open the Temp Chamber Template VI in the C Solutions LabVIEW DSC directory If you completed Exercise 3 1 open the Temp Chamber Ex 3 1 VI in the C Exercises LabVIEW DSC directory 2 Open and examine the block diagram Controls the brightness of the LED that simulates the Light Intensit Light Intensit ab Control ight Intensity DBL DELE a The top While Loop controls the color of the Light Intensity indicator As the value of the Light Intensity control changes the color of the Light Intensity indicator changes from white to dark yellow This simulates the real world environment of the Temperature Chamber b The bottom While Loop controls the Spinning Fan control created in the optional Exercise 3 1 If you are using the Temperature Chamber Template VI the Spinning Fan indicator corresponds to the fan on the front panel As the Fan Speed slider increases the time sent to the Wait function decreases and the While Loop updates faster causing the Spinning Fan control to alternate bet
10. Percent Deadband a Channel 6 QQ Devices and Interfaces HI Historical Data Scales i Software ma IVI Drivers 8 Remote Systems fag PXIB176 E ControlsGroup b AELibrary010131 GI Data Neighborhood One channel at a time Ef FP 2000 0 Bank FP 2000 GD Revert h FP PWM 520 2 de Test fy PXI8146 Channel 7 Channel Attributes Attribute Value Thermocouple type gt in Create Item lt amp Device Configuration Channel Configuration 5 Click the FP PWM 520 module in the configuration tree to select it 6 Click the Channel Configuration tab at the bottom of the right side of the window 7 Make sure there is a checkmark in the Channel 0 checkbox Set Range to 0 to 100 Percent Set Watchdog Value to 0 Set Power Up Output Value to 0 Click the Apply button LabVIEW DSC Module Course Manual 2 20 ni com 8 Place a checkmark in the Channel 1 checkbox and duplicate the settings in step 7 for this channel 9 Click the symbol to expand the Data Neighborhood group in the configuration tree Click the symbol to expand the FieldPoint Items group Click the symbol to expand the FP YOUR_IP ADDRESS group 10 Click the TC 120 to select it Click the Start button at the top of the window Notice the value for Channel 0 It should be in the range of normal room temperature 60 80 F If it is not notify your instructor 11 Click the PWM 520 and th
11. MotorRPMSensor Analog Input MotorRPMSetPoint 4nalog Input Output RPM Data Set ID Tag String Memory RPM Data Set Run Tag Discrete Memory Figure 5 1b List of Tags in TCE National Instruments Corporation 5 21 LabVIEW DSC Module Course Manual Save your SCF file as dataset scf inthe C Exercises LabVIEW DSC directory If prompted stop and restart the Tag Engine If you do not save the SCF file you will not see the changes in the Data Set Logger configuration window Select Servers Data Set Logger Configuration Select the Definition tab and modify it as shown in Figure 5 1c The Data Set Name identifies the data set The ID Tag in this case is RPM Data Set ID Tag Your control tag is RPM Data Set Run Tag When its value is ON the Data Set Logger logs the start marker When its value is OFF the Data Set Logger logs the end marker thus marking off one run gt Data Set Configuration RPM Data Set xj File Edit Definition Tags Advanced Data Set Name Rem Data Set ID Tag RPM Data Set ID Tag x Description i test El el Start when Discrete Tag ON Tag RPM Data Set Run x End when Discrete Tag OFF 7 Tag RPM Data Set Run Figure 5 1c Data Set Logger Configuration Click the Tags tab and click the Add button to select the tags you want to include in your data set All tags traces to which a data set refers must be logged in the same database For this exercise add the MotorRPMSetPoin
12. National Instruments Corporation 1 21 LabVIEW DSC Module Course Manual Exercise 1 1 Exploring the DSC Module Documentation and Help Objective Locate and browse the available DSC Module documentation examples and palette DSC Module Documentation 1 Select StartyPrograms National Instruments LabVIEW 7 LabVIEW to launch LabVIEW 7 Express 2 Select Help Search the DSC Module Bookshelf to view the documentation for the DSC Module 3 Take a few minutes to browse the available documentation DSC Module Examples 1 In LabVIEW select Help Find Examples to launch the Example Finder 2 Navigate to Toolsets and Modules Datalogging and Supervisory Control to find the LabVIEW DSC examples 3 Take a few minutes to browse through the examples that ship with the LabVIEW DSC Module DSC Module VIs 1 Open a blank VI and select Window Show Block Diagram to open the block diagram Press the lt Ctrl H gt keys to open the Context Help window if it is not already displayed 2 Right click the block diagram to open the Functions palette if it is not already displayed LabVIEW DSC Module Course Manual 1 22 ni com 3 Use the Context Help as you explore the DSC Module VIs on the Functions palette 4 Close the VI when you are finished Do not save changes End of Exercise 1 1 National Instruments Corporation gt Fu 4 DR KIEE IEA 8a 1 23 LabVIEW DSC Module Course Manual Notes LabVIEW DSC
13. Summary e LabVIEW DSC provides the capability to easily incorporate security into your application such as creating and managing user accounts controlling tools access and SCF file access e Security for the user interface is implemented using the Security Wizard e You can programmatically control the Tag Engine using the system VIs e You can create your own servers using the Vl based server development VIs National Instruments Corporation 8 21 LabVIEW DSC Module Course Manual Exercise 8 1 Creating Accounts and Security Options Objective To become familiar with applying security to the tools of the LabVIEW DSC module Add a password to the Administrator account By default the Administrator account does not have a password In the next few steps you will define an Administrator s password The recommended password for this course is dsc lower case 1 Start LabVIEW and open a blank VI 2 Make sure you are logged on as Administrator otherwise select Tools User Name and log on as Administrator no password 3 Select Tools DSC Module Security Change Password 4 Enter a new password for Administrator Enter the same password in the Verify textbox Make sure you remember the password taking into account it is case sensitive Click the OK button 5 Select Tools DSC Module Security Logout to log out 6 Select Tools User Name and log back on with the Administrator password 7 Select
14. The LabVIEW DSC module includes VIs that allow retrieving data sets They are located in Functions Palette DSC Module VIs Historical Data Data Set Logger VIs List Data Sets VI Based on specified database URL this VI returns all data sets stored in that particular database List Data Set Runs VI Based on specified data set this VI returns all the data runs stored for that particular data set Read Data Set Run By ID Based on the specified run ID s or internal ID s this VI extracts and returns all the data for the run matching the specified ID in a particular data set LabVIEW DSC Module Course Manual 5 6 ni com a Viewing Data Sets in MAX Part 1 of 2 Open MAX or select Tools DSC Module View Historical Data Citadel 5 Universe Measurement amp Automation Explorer 5 x File Edit View Tools Help Configuration A Gview pata z Refresh Options 5 show Help E Q My System ba eu Er Universe 63 GA Data Neighborhood k a ji KSK B My Computer ansaha le core C_Program_Files_National_Instruments_LabVIEW_7_0_data BJ Historical Data cs Network n Add Remove Traces and Data Set Runs E aixi Scales ZE J Available tems I Software AlarmsjEvents view E Universe a 4 User Folder EG My Corg ha 1 MA M Drivers ba a jes_National_Instuments_LabVIEW_7_0_data J Remote Systems la st 13 45 39 0xDD38B2F245D232AC st 13 45 56 0x3084F
15. LabVIEW DSC Module Course Manual 3 26 ni com 5 Use the HMI Wizard to add necessary code for temperature in chamber Add a waveform chart to the front panel b On the front panel right click the waveform chart and select HMI Wizard from the shortcut menu c Select Channel 0 on the TC 120 module and click the Add button gt HMI Wizard for Real Time Trend Tag List Tag FP 10_0_34_16_FP TC 120 wl FP 10 0 34 16 FP TC 120 1 A a fal 1 00 Time between updates seconds Engineering units Percent of full scale d Click the OK button The HMI Wizard generates the necessary code 6 Review the code the HMI Wizard generates a Open the block diagram The HMI Wizard created code for each Tag Connection and a While Loop that monitors the Tag Engine Status b The conditional terminal is connected to the Tag Engine Status of the Get Engine Status VI c Code generated by HMI Wizard is locked To edit the code right click and select Release Wizard Lock from the shortcut menu National Instruments Corporation 3 27 LabVIEW DSC Module Course Manual 7 Build the following block diagram Controls the brightness of the LED that simulates the Light Intensit ight Intensit ELE cp My i m pn Da 8 Modify the code generated by the HMI Wizard that monitors Tag Engine This will give the user
16. LabVIEW DSC Module Course Manual 6 6 ni com Exercise 6 1 The Effects of Deadbanding Approximate time to complete 20 min Page 6 25 To view the effects of deadbanding on data update rates OBJECTIVE National Instruments Corporation 6 7 LabVIEW DSC Module Course Manual l Setting Default Parameters for Tags Set the defaults for the configuration Set Default Parameters o xi Daan Toa Paone wizard and manual r Data Configuration Alarm and Events Configuration Update Deadband z cope vend Analog Tags Update Deadband z Enable Alarms et a ire tag creation 1 0 Group Update Rate secs 02 pl ee iced Analog Tags Alarm Deadband 1 1 0 Group Deadband 1 a Enable Bad Status Alam TRE Bad Status Alarm Priority 15 Analog Tags Log Data Deadband 1 e 0 n a a 0 C a n e Analog Tags Log Resolution 001 Other Tag LogDa awhen C Always On Change BoA most values saves Suing Tags as BLOB Sting Tage as TEXT 5 Defaut Logging Directories a time and work Event Logging Path data sz JERSTRUMENTS Default Tag Parameters Notice that when you begin configuring tags many fields are already set to certain default values If you would like to have these fields default to different values go into Configure Default Parameters in the Tag Configuration Editor and you can change the defaulted values If you are going to be
17. 5 Build the following front panel gt 6_3 Simple Loop vi Front Panel gt MN 13pt Application Font LabVIEW DSC Module Course Manual 6 32 ni com 6 Open the block diagram and build the following block diagram urrent Temperature i Heat Lamp Control v Place a While Loop located on the Functions Structures palette on the block diagram Place a Read Tag VI located on the Functions DSC Module VIs Tags palette on the block diagram Right click the tag name input and select Create Constant from the shortcut menu to create the input constant Repeat these steps for the timeout input Place a Greater function located on the Functions Comparison palette on the block diagram Wire it as shown in the previous figure Place a Select function located on the Functions Comparison palette on the block diagram Right click the t and f inputs and select Create Constant from the shortcut menu Set the values of the constants to 0 and 50 for the t and f respectively Place a Write Tag VI located on the Functions DSC Module VIs Tags palette on the block diagram Create constants for the tag name and write value on change inputs as shown in the previous figure 7 Select File Save and save the VI as Simple Loop vi inthe C Exercises LabVIEW DSC directory 8 Runthe VI and adjust the desired temperature Watch as the temperature moves to the desired temperature and then hovers there 9 Stop and close the V
18. 8 1 The following are the objectives of this exercise To familiarize yourself with the applying security to the tools of the DSC Module e Add a password to the Administrator account e Make an additional group Engineers which has access to level 8 e Add two users to your system an operator named Guy and an engineer named Rick Prevent operators from accessing the Tag Monitor e Start the system with the login window when LabVIEW is launched National Instruments Corporation 8 7 LabVIEW DSC Module Course Manual Securing Your SCF File EOE x e These settings apply to 3 ALL tags Set control over SCF file a Who can configure logging p ak r Who can create edit tags e Control which users can read or write tags e Determine which machines on the network can read write tags TE JERSTRUMENTS Security for the SCF File The settings for the SCF file apply to all tags in the SCF file In other words you can grant access to some tags but not to others In order to control security for specific tags use individual tag security discussed in the following pages or the Security Wizard on front panel controls or indicators Because these changes are going to apply to an SCF file the configuration is done from the Tag Configuration Editor TCE In the TCE select Configure Security to open the Access Rights Configuration dialog box This dial
19. Complete the following steps to create code for controlling the temperature in the Temperature Chamber based on a setpoint and a PID algorithm for controlling output to the light intensity and fan speed Front Panel 1 Open the Temp Chamber Ex 3 3 VI located in the C Exercises LabVIEW DSC directory 2 Rename the second and third tabs on the tab control to PID Settings and PID Output respectively Modify the front panel as shown in the following figure Real Time Data PID Settings PID Output Light Intensity PID Output Temperature 100 00 Waveform Chart Setpoint LabVIEW DSC Module Course Manual 7 28 ni com 3 Right click the Light Intensity control and select Replace Functions Numeric Indicators Gauge from the shortcut menu to replace the existing control with a gauge control Repeat this step to replace the Fan Speed control with a gauge control a Right click the Light Intensity gauge and select Change to Indicator from the shortcut menu b When prompted click the OK button to allow the modification of the wizard connection Changing this control to a indicator will modify the wizard connection to this object Do you want to continue Cancel c Repeat step b for the Fan Speed gauge 4 Add a waveform chart to the PID Control tab a Right click the waveform chart and select Visible Items Digital Display from shortcut menu b Expand the Plot Legend to display two plots 5 Create a contro
20. Controls All Controls Containers palette on the front panel and resize the tab control d Place a Stop button located on the Controls Buttons and Switches palette on the front panel and resize the button LabVIEW DSC Module Course Manual 3 20 ni com 2 Create the tank using the Image Navigator a Select Tools DSC Module Image Navigator to open the Image Navigator Image Navigator Tank 1 File Edit View Options Help Categories b Select NI Tanks Tank 1 from the Image Navigator c Drag the tank from the Image Navigator to the front panel to place the tank on the front panel d Use the Positioning tool to resize the tank to an appropriate size 3 Modify a round LED to fit on top of the tank You will modify the color later to simulate light intensity a Place a round LED located on the Controls LEDs palette on the front panel b Resize the LED to appropriate size and place it over the top of the tank 4 Create the spinning fan custom control a Place a square LED located on the Controls LEDs palette on the front pane and resize it appropriately b Right click the square LED and select Advanced Customize from the shortcut menu to open the Control Editor National Instruments Corporation 3 21 LabVIEW DSC Module Course Manual c From the Image Navigator select Blowers Etc from Categories Then right click Cool Fan animation Frame 1 and select Copy from the shortcut menu Image Navi
21. Corporation 4 31 LabVIEW DSC Module Course Manual Notes LabVIEW DSC Module Course Manual 4 32 ni com Lesson 5 Advanced Database Management TOPICS A What Is a Data Set B Keeping Your Database Slim C Importance of Archiving and Backing Up Data D Merging and Restoring Databases By the end of this lesson you will be able to answer the following questions e What are data sets How do you create them and view them e What are some ways to minimize disk space used by databases e How do you compact and archive data in databases e How do you merge databases together National Instruments Corporation 5 1 LabVIEW DSC Module Course Manual The Importance of Database Management e Simplifies finding and retrieving data e Keeps database size manageable e Keeps databases organized e Archives and backs up data JF STRUMENTS Why is Database Management Important When logging data continuously for a long period of time to the Citadel database you might want to organize the recorded data If you are recording to one database it may get large in size making it harder to manage and back up Storing in a different database periodically or using the archiving tools allows you to back up the databases more easily Also using one database to store data for a smaller amount of time allows you to find data faster instead of having to parse through one big database that contains all the data Some methods of
22. Engine LabVIEW DSC Module Course Manual 7 2 ni com Client Server Architecture Local System DSC Module Client Vis Citadel Read Write Read Write Tags Tags HMI Wizard Server Tag Engine Client and Server Vis OPC Server access the same Tag Engine I O Hardware ni com NATIONAL F STRUMENTS The Tag Engine provided by DSC serves data to each component of the DSC Module architecture The Tag Engine acquires data from multiple I O sources both local and remote The Tag Engine is a built in server for the DSC Module For more advanced applications a server you create can add control and management capabilities to a DSC Module application The HMI Wizard is a tool that increases a developer s efficiency by quickly creating code used to communicate with the LabVIEW DSC Tag Engine In this lesson you will expand on the exercises from Lesson 3 Designing your LabVIEW DSC Application and create a server for PID control for the temperature chamber This PID Server accesses the Server Engine through the DSC Module to read and write to tags that control the inputs and acquire responses from FieldPoint hardware Then you create a client that can read and write to the same tags that the server accesses The HMI Wizard increases development efficiency considerably National Instruments Corporation 7 3 LabVIEW DSC Module Course Manual gt gt gt Server Philosophy Review e Servers should be sta
23. KE GE List users 5 e List user account info e List groups e List group info e Check user privileges saa JERSTRUMENTS Interface Security for VIs You can use the VIs on the DSC Module Security palette to do a variety of tasks Y ou can login programmatically or have the DSC Module open a login dialog box Y ou also can have your VI log the current user off the system You can check whether a user has access to a particular DSC Module tool or you can get information on the currently logged in user LabVIEW DSC Module Course Manual 8 12 ni com Programmatic Control Examples Login Logout Do some task lessage to user Sas Sorry you do not have access Using the DSC Module security VIs you can programmatically login or logout of LabVIEW or can check various security settings and privileges This allows the developer to implement customized security settings and policies for the application The Login Logout example uses NI SEC Programmatic Login vi andNI SEC Programmatic Logout vi to log a user in and then out following some operation The Checking for privileges example programmatically checks to see if the currently logged in user has access to start or stop the tag engine National Instruments Corporation 8 13 LabVIEW DSC Module Course Manual Optional Exercise 8 3 Programmatically Controlling User Access Approximate time to complete 20 min Page 8 28
24. Module Course Manual 1 24 ni com Lesson 2 Getting Started with the LabVIEW DSC Module TOPICS A The Basic Steps of DSC Development B Choosing the Proper Hardware C Tags and Your Hardware D What Is the Tag Engine By the end of this lesson you will be able to answer the following questions What hardware is best for my applications What is a tag Why are tags important How do I adjust the attributes of my tags to my liking How can I organize tags for differing uses What is the Tag Engine What does the Tag Engine do for my programs National Instruments Corporation 2 1 LabVIEW DSC Module Course Manual EEE The Basics of LabVIEW DSC Development 1 Choose the proper hardware 2 Configure your tags 3 Customize your VI ni com NATIONAL FNSTRUMENTS The Basic Steps of DSC Development Since DSC will take care of many frequent issues the design process with DSC becomes simple When you know what data you need to interpret complete the following steps 1 Choose the right hardware An important factor in choosing hardware is finding a device capable of making your desired measurements That is why it is important to know what data you are seeking to gather Another factor is choosing the right hardware for what you plan to do with the data you receive For example if you need to sample data onl
25. Panel Wizard The Panel Wizard code uses VI Server a LabVIEW Advanced topic to make sure a VI is running and open or view its Front Panel With the HMI Wizard you must not fully understand the code generated by the Panel Wizard Rather only a general concept of how the Panel Wizard works is needed to fully leverage the advantage given to you by the Panel Wizard The code generated by the Panel Wizard is initially locked to prevent accidental modification of the code To unlock the code right click the lock icon for the code After you unlock you cannot relock the code Generally you should unlock the code only if you have a specific reason to do so Unlike the HMI Wizard is it not as convenient or immediately useful to modify the code generated by the Panel Wizard National Instruments Corporation 3 17 LabVIEW DSC Module Course Manual Exercise 3 3 Using the Panel Wizard Approximate time to complete 15 min Page 3 29 To use the Panel Wizard to generate panels to view historical traces and also generate code that launches a subVI from LabVIEW DSC OBJECTIVE LabVIEW DSC Module Course Manual 3 18 ni com Summary e Client Server relationships Design a Server to supplement Tag Engine Client retrieves Data from Server HMI Wizard Automatic Code Generation Front panel DataSockets Used to connect Tags Elements of effective user interface Image Navigator e Using the Pane
26. SCF file is first saved from the Tag Configuration Editor TCE When saving the SCF file click Configure in the SCF Summary dialog to open the Historical Logging Configuration dialog You also can change these directories from the TCE under the Configure Historical and Configure Events menus LabVIEW DSC Module Course Manual 4 6 ni com Configuring Your Logging Options PTA TZW ZA To log data General Connection Operations Scaling Alarms 1 A tag must be set to Log Engne Data by editing it in the dA A 7 Tag Configuration Editor The engine also must be logging data Logging Data and Events C Log Print Events v Log Data og Deadband of range l Log Resolution engineering units 0 1 l J 3 El 3H Qe Jef ault scf LabVIEW B E gine Manager Cv Log Data Data V Log Events C Print Events Cancel Eror Dialog C Show Events Configuring Your Logging Options To log data you first must specify which tags will and will not have their values logged by using the Tag Configuration Editor You also must then ensure that the Engine is set to Log Data when it is running This can be done in the Engine Manager by double clicking the Tag Engine icon on the taskbar Log Deadband will be discussed in a later lesson National Instruments Corporation 4 7 LabVIEW DSC Module Course Manual Viewing Historical Data View Historical Data i
27. Steps 1 2 and 3 are transparent to the user They are handled by the DSC module ni com NATIONAL F STRUMENTS Logging to a Database DSC logs data in the following manner First the Tag Engine acquires the value of a tag and updates it This values appears in the VI and is also sent to the Citadel database Citadel then determines the appropriate location in the database to store the data Citadel can accumulate and store this data These stored data points often referred to as Historical Data are available for use by other programs at any time This includes the Historical Data Viewer and MAX LabVIEW DSC Module Course Manual 4 2 ni com Where Does Citadel Fit In Cy EJ Networking CE CT Security Alarms Trends Data Logging Where Does Citadel Fit In Examine this diagram that we introduced in Lesson 1 Datalogging and Supervisory Control DSC Module Overview Observe that the Citadel database is responsible for logging data and storing historical trends National Instruments Corporation 4 3 LabVIEW DSC Module Course Manual Citadel LabVIEW and Your Data lt a LabVIEW Vis Oo Your Program Log Data DSC Citadel and Alarms Tag Engine ee EE NI DAQ FieldPoint NI or Third Driver Driver Party Drivers FieldPoint Third Party ni com NATI
28. Tools DSC Module Security Edit User Accounts to launch the User Account Manager to edit user security 8 Select User New Local Group to create a new group called Engineers New Local Group F x Group Name Engineers Description Members have access level 8 Cancel Security Level JE Hp Members Remove LabVIEW DSC Module Course Manual 8 22 ni com 9 Add two users to your system an operator named Guy and an engineer named Rick Select User New User Account to create a new user in the User Account Manager Do not fill in the password just define the user name 10 To make Guy a member of the Operators group click the Groups button Highlight Operators in the Not Member of box and click the Add button x Username Guy OK Full Name Cancel Description E Help Password Confirm Password x Security Level 5 OK Minutes idle until logoff o DRZE 7 i ance Password Never Expires Password Expires In Days __Heb 7 Account Disabled Member of Not Member of m Pa EA Administrators ga EJ Engineers ema EA Guests zzz _Bemove gt _Bemove gt A System Operators National Instruments Corporation 8 23 LabVIEW DSC Module Course Manual 11 Repeat step 10 to create user Rick and make him part of the Engineers group 12 Exit the User Account Manager At this point everyone has full access to the Tag Monitor In the next few steps you will preve
29. VIs Thus you can effectively hide unnecessary details about your hardware from your VIs The following example describes this You have a piece of hardware that reads a temperature With the DSC Module you simply assign a tag to that temperature and give it a descriptive name in this case Temperature In the DSC Module VI you need only to reference that tag name to read the temperature from that device In addition to accessing your hardware tags also can read and write values to memory This is useful for two reasons trying to share data over a network and when testing VIs Tags allow you to simulate your hardware without it being installed Y ou simply write to and read from memory instead of to and from your hardware LabVIEW DSC Module Course Manual 1 10 ni com Rapid Development with Wizards Wizards simplify creating tag connections HMI Wizard Allows you to automatically connect a control indicator to a tag Tag Configuration Wizard Simplifies the process of creating a tag Panel Wizard Allows you to easily integrate multiple windows into your application ATIONAL INSTRUMENTS M Rapid Development The DSC Module includes wizards that streamline and simplify development While the wizards are designed to be easy to use they also allow access to advanced characteristics National Instruments Corporation 1 11 LabVIEW DSC Module Course Manual HMI Wizard e HMI Human M
30. anything but in this case you add the timestamp to the field to make it unique and identifiable You could have simply set the ID for each run to be Test 1 Test 2 and so on An ID tag is a string or analog tag in your active SCF file When you start logging a data set the value of the ID tag at that time becomes the identifier of that data set run gt Tag Configuration Editor lt Untitled gt LabVIEW String Tag Configuration lt Untitled gt Ble Edt Tools Configure servers Window Help General Connection Operations Scaling Alarms BO ALE Analog Tag m Name Group Description Discrete Tag Bit Array Ta 1 MotorRPMSensor See n MotorRPMSetPoint Tag Hema RPM Data Set ID Tag 9 Tag Group lt ALL gt z Maximum Length 80 Text Data Only V m a Tag Description Security Cancel Similarly create a discrete memory tag and name it RPM Data Set Run Tag This control tag determines the start and end timestamps of a run When a condition is met the Data Set Logger logs the start or end marker When the start condition is met a new run starts provided that the previous run has ended When the end condition is met the run ends The complete list of tags is shown in Figure 5 1b gt Tag Configuration Editor dataset scf LabYIEW File Edit Tools Configure Servers Window Help AA ZIBJ 1513 Tag Name Tag Group Data Type __ Tag Access
31. application correctly on the network requires some changes First you have the DSC Module synchronize the clocks between the two computer systems This feature ensures that timestamps from the server are consistent with the system time of the client You must modify the SCF file so that it reads the tag values for the server machine A single machine client VI requires a few changes to run on the network to ensure that the display of logged data performs correctly If you are not displaying logged data then you can use the non networked client without changes Also copy Lookout sec from the Windows directory of the server to the Windows directory of the client system so that you have the same accounts on both machines Synchronizing System Clocks Note You must log on to the DSC Module as an Administrator To synchronize the system clock between your client machine and the server select Tools DSC Module Options Click the Advanced tab and click Time Synchronization Click Add to add a machine to synchronize time with Select your server from the machines on the network and click OK on the remaining dialog boxes The times for the two machines are synchronized LabVIEW DSC Module Course Manual 7 18 ni com hh Sharing Windows Directories raj Pea 1 Double click TER My Computer Documents and Settings sampe Progra E AEAT 2 i Rig ht cl ick fo Ider to mk Open Gieneral Sharing Security Customize Gy Explore gt You c
32. control to stop the program independent of the Tag Engine a Copy the Stop Button local variable from the top While Loop b Insert an Or function located on the Functions All Functions Boolean palette Connect the Stop local variable and the Engine Status to the Or function This will allow either the Stop button or a true returned from Engine status to stop the While Loop 9 Modify the code generated by the HMI Wizard for temperature output on Waveform Chart a Right click Wizard Lock on the Sequence Structure created by the HMI Wizard and select Release Wizard Lock from the shortcut menu b Add an Or function and another copy of Stop local variable to the While Loop that is located inside this Sequence Structure c Remove the Not from the While Loop Connect Shutdown from the Trend Tags VI to the bottom of the Or function d Right click the While Loop conditional terminal and select Stop if True from the shortcut menu e Wire both loop terminals to the edge of the Sequence Structure that reinitializes the value of the Stop Boolean 10 Save the VI as Temp Chamber Ex 3 2 in the C Exercises LabVIEW DSC directory End of Exercise 3 2 LabVIEW DSC Module Course Manual 3 28 ni com Exercise 3 3 Using the Panel Wizard Objective To demonstrate the features of Panel Wizard Complete the following steps to use the Panel Wizard in LabVIEW DSC to programmatically launch the Historical Data Viewer Use the Panel Wizard to
33. data means not necessarily where it comes from Use descriptive and consistent tag names Image Navigator JF NSTRUMENTS Review of Client Basics In Lesson 3 Designing Your LabVIEW DSC Application you learned the basics of a good client design The DSC Module includes tools like the HMI and Panel Wizard that speed the development of DSC Module clients Create descriptive tags when setting up tags in the Tag Engine in the DSC Module Using descriptive tags makes creating clients easier Another feature of the DSC Module is the Image Navigator which allows you to add various images to the front panel that help users understand the real world environment National Instruments Corporation 7 9 LabVIEW DSC Module Course Manual What Features to Include in Your Client e Ability to change setpoints or basic inputs e Display outputs and necessary information e Analysis and control still performed on the server For a normal client application you might want to include features such as the ability to modify a setpoint that controls the algorithms on the Server VI You also might want to display relevant information about the system being controlled by the DSC Module The key piece to remember is that analysis and control is still performed on the server LabVIEW DSC Module Course Manual 7 10 ni com Exercise 7 2 PID Control Client Approximate time to complete 25 min Page 7 32 To create a client
34. diagram and wire the tag constant into the tag name input Place a Wait function in the While Loop and wire a constant with a value of 500 to the input Run the VI and try adjusting the Write value knob Close the VI When this VI runs the Tag Engine dynamically launches the VI Based server called Dummy Server but the user does not see this happening because it is all handled transparently End of Exercise 8 4 National Instruments Corporation 8 33 LabVIEW DSC Module Course Manual Notes LabVIEW DSC Module Course Manual 8 34 ni com Additional Information and Resources This appendix contains additional information about National Instruments technical support options and LabVIEW resources National Instruments Technical Support Options Visit the following sections of the National Instruments Web site at ni com for technical support and professional services e Support Online technical support resources at ni com support include the following Self Help Resources For answers and solutions visit the award winning National Instruments Web site for software drivers and updates a searchable KnowledgeBase product manuals step by step troubleshooting wizards thousands of example programs tutorials application notes instrument drivers and so on Free Technical Support All registered users receive free Basic Service which includes access to hundreds of Application Engineers worldwide in the NI Developer Excha
35. different colors format the alarm display table and filter out certain alarms in the Colors Format and Filters tabs respectively Finally click OK to accept the parameters and have the wizard generate code Alarms can be acknowledged programmatically using the Acknowledge Alarm vi Details on this VI are covered in a later slide Y ou also can acknowledge alarms using the Alarms amp Events Display Note Alternative methods exist for viewing alarms including the Alarm Event Display Tag Monitor and the Historical Data Viewer s Alarm amp Event View LabVIEW DSC Module Course Manual 4 16 ni com EE Viewing Alarms Using Alarm amp Event Display Select Controls Palette DSC Module Alarms and Events Alarm amp Event Display The Alarms amp Events Display allows you to view and acknowledge alarms and events e You can view alarms and events on a local computer or a remote computer 7 properties alt Enter gt Acknowledge Acknowledge Al O 12728 2003 Admi O 12 28 2003 Admi OLO 12 28 2003 Admi o 12 28 2003 Admir ni com NATIONAL F STRUMENTS Viewing Alarms Using Alarm amp Event Display Use the Alarm amp Event Display control on the front panel to view events as well as view and acknowledge alarms Unlike the HMI Wizard this ActiveX based control displays all tags configured to log alarms for a particular process As a
36. generate code that launches a subVI that you will use in the next exercise Part A Historical Data Viewer 1 Open the Temp Chamber Ex 3 2 VI that you built in Exercise 3 2 Real Time Data Alarms Historical Data Temperature in Chamber Chamber Temperature zma 140 130 Temperature F o DB KJ 1 1 LI wo 1 c o O Time Historical Data Viewer Historical Trend 2 Create the Historical Data Viewer button shown above by placing an OK button located on the Controls Buttons amp Switches palette on the front panel 3 Right click the button select Visible Items Label from the shortcut menu and click Label to turn off the label The Panel Wizard names the button Historical Data Viewer by default National Instruments Corporation 3 29 LabVIEW DSC Module Course Manual 4 Use the Panel Wizard to generate code a Right click the Historical Data Viewer button and select Panel Wizard from the shortcut menu to open the Panel Wizard The following screen appears Panel Wizard With this control Open a Panel v Panel Button Polling Login prompt Historical Data Viewer Tag Monitor Ov Path to VI Browse Relative path b Select Historical Data Viewer c Click the Polling tab and select Always Panel Wizard With this control Open a Panel v Panel Button Folling Poll this control Until engin
37. like that of the HMI Wizard in that it can be unlocked and modified by right clicking the lock icon modifying code created by the Panel Wizard is not recommended The code generated by the Panel Wizard is complicated and modifying the can cause undesirable behavior in your VI Avoid unlocking the code unless you have a specific reason to do so LabVIEW DSC Module Course Manual 3 14 ni com When and How To Use the Panel Wizard Visible Items Find Terminal Change to Indicator Create Replace Data Operations Advanced Mechanical Action Release Text Properties gt Description and Tip gt gt gt gt gt La Panel Wizard When and How To Use the Panel Wizard With this control Open a Panel v Panel Button Polling O Tag Monitor Ov Path to YI O Login prompt O Historical Data Vere 0 Relative path Browse eb OK J Cancel Right click button and select Panel Wizard Select the desired action of the button and a VI if applicable Set any other desired behavior on additional tabs While the Panel Wizard might not apply to all applications the Panel Wizard can add functionality to your programs Any time you want to incorporate another VI view previous tag values over a period of time or change the current user then the Panel Wizard is a good choice To use the Panel Wizard place any button o
38. list specifics of what a tag is being used for and what it is connected to National Instruments Corporation 2 15 LabVIEW DSC Module Course Manual Tag Attributes Connection Tag Access Input Output Input Output Memory Server Where data is coming from I O Group How often to get data Item Connection 0 a from server Access Path _ lt NoneSelected gt gt Item Which item on the server Add Edit Delete tentesi taies e Access Path Choosing mea communications hardware ni com NATIONAL F STRUMENTS Tag Attributes Connection Note The Tag Configuration Wizard TCW configures this information for you when you create the tags In general you need to work with this tab only if you need to make modifications to the defaults of the TCW The Connection tab associates a tag name with an item from a server Notice that if the tag access is Memory the Engine does not make any kind of connection to or from the tag When you create a memory tag the VI places values there For other tag access the Engine automatically connects to an item on a server To make this connection the tag needs several pieces of information Which server are you talking to How fast do you want to get information from the server Which is handled by the I O group On that server what item should be read write for this tag If you do not want to type the item in manua
39. managing databases include the following using data sets managing database size backing up or archiving databases merging databases and so on LabVIEW DSC Module Course Manual 5 2 ni com Data Set e Group of tag values that are logged together for a finite period of time e Useful for organizing historical data leasurement amp Automation Explorer lol x Archive pi Export to Text Export to DIAdem show Help Ki 4 gt PI 9 9 11710 2003 1 46 98 PM Central Standard Time R 100 _ MotofiPMSensor Motor FMSetPoni Tiaces configured in data set Motor Response Set ni com NATIONAL JF STRUMENTS What is a Data Set The DSC Module has a feature that allows you to organize your historical data into data sets A data set is a group of tag values that are logged together during some finite period of time Since they are logged together for same amount of time a data set might contain tag values for a certain test For example in this slide three tests were performed on a motor to measure the motor response to a triangle like setpoint function The white line is the motor response to the setpoint value represented by the other line The Data Set Logger marks the beginning and the end of each test with special markers The data between the start and end points is called a run Each run is identified by its ID In the motor example one test
40. monospace italic The following conventions are used in this course manual The symbol leads you through nested menu items and dialog box options to a final action The sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and select Options from the last dialog box This icon denotes a tip which alerts you to advisory information This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash Bold text denotes items that you must select or click in the software such as menu items and dialog box options Bold text also denotes parameter names controls and buttons on the front panel dialog boxes sections of dialog boxes menu names and palette names Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that you must supply Text in this font denotes text or characters that you enter from the keyboard sections of code programming examples and syntax examples This font also is used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions Italic text in this font denotes text that is a placeholder for a word or value that you must supply
41. shortcut menu Exercises Properties General Sharing Security Customize You can share this folder with other users on your network To enable sharing for this folder click Share this folder Do not share this folder Share this folder Share name Exercises Comment User limit Maximum allowed Allow this number of users To set permissions for users who access this folder over the network click Permissions To configure settings for offline access click Caching National Instruments Corporation 7 45 LabVIEW DSC Module Course Manual 19 Select Share this Folder in the Sharing tab 20 Click the Permissions button and verify that Everyone is present For a secured system you can add selected users Permissions for Exercises Share Permissions Group or user names A E verore Permissions for Everyone Allow Deny Full Control Change Read 21 Select Full Control and click the OK button 22 Click the Apply button in the Permissions dialog box and then click the Apply button for the Exercise Properties dialog box LabVIEW DSC Module Course Manual 7 46 ni com 23 Onthe Client computer your machine access the shared folder of your neighbor 24 Right click My Computer and select Map Network Drive from the shortcut menu Map Network Drive Windows can help you connect to a shared network F
42. the Engine Manager window double click the Engine Manager icon in the Taskbar This icon can be found in the lower right corner of the screen next to the clock Clicking the Show Events checkbox opens the System Events window which lists all of the system events that have occurred National Instruments Corporation 8 15 LabVIEW DSC Module Course Manual Programmatic Engine Control System VIs Start stop engine Enable disable event logging Enable disable historical data logging Load unload SCF files sip Controlling the Engine The Engine also can be controlled programmatically using the System VIs These VIs allow your application to programmatically launch or shutdown the Engine modify the logging behavior of the Engine or load another SCF file LabVIEW DSC Module Course Manual 8 16 ni com Sample Engine Control VI Launch engine with Shutdown ait for Switch Restart particular SCF file Wait 5 seconds Engine shutdown SCF filesj Engine C Program Files National Instruments LabVIEW 6 default scf 5000 Launch the Engine with one SCF file wait shutdown Engine switch SCF files and re launch NATIONAL F STRUMENTS Sample Engine Control VI The most common reason for using the system VIs to programmatically control the tag engine is to change SCF files In
43. the LabVIEW Registration name Login automatically with the Operating System user name Login automatically using the most recently logged in user Login automatically with the following user account Name lt prompt gt Password J Show login dialog if automatic login fails 21 Restart LabVIEW and notice that after a short delay it automatically displays the login dialog box when you try to open a VI End of Exercise 8 1 LabVIEW DSC Module Course Manual 8 26 ni com Exercise 8 2 Incorporating Interface Security into a VI Objective Add front panel security to your client VI 1 Load the Temp Chamber VI from Exercise 3 2 2 Right click the Light Intensity slider and select Security from the shortcut menu 3 Select the User or Group Everyone and select Disabled amp Grayed Out from the Access pull down menu 4 Click the Add button to add a new user group Set the access rights of the new group to Full Access Double click the Engineers group and the Administrators group and click the OK button The Access Rights dialog box should be similar to the following figure Click the OK button to accept these security settings x Light Intensity Light Intensity Everyone Disabled amp Grayed Out Engineers Full Access Administrators Full Access HI Set All to Match Access Disabled amp Grayed Out gt Cancel Add Remove Help 5 Repeat steps 2 through 4 for the Fan Sp
44. the PID Server VI from Exercise 7 1 Add a memory tag that will update the DSC Tag Engine with server status and use the HMI wizard to add code necessary to monitor the Setpoint value from the PID Server VI Front Panel 1 Open the PID Server Ex 7 1 VI located in the c Exercises LabVIEW DSC directory 2 Use the HMI Wizard to create a memory Tag for Setpoint a On the front panel right click the Setpoint control and select HMI Wizard from the shortcut menu Click the Create New Tag button gt HMI Wizard for Analog Control Data Connection Alarms Tag Value Control Properties Match control label to tag name Match scale to tag configuration Max 0 00 Min 0 00 Units Cancel LabVIEW DSC Module Course Manual 7 32 ni com c Click the Memory Tag button Select Items for Automatic Tag Gen x Servers Cookie Factory Demo Dummy Server National Instruments D aqO pc National Instruments LookoutOPCServer National Instruments OPCDemo National Instruments OPCFieldPoint National Instruments OPCLookoutDrivers W Registered Computers A Tanks Server Set Tag Defaults Properties Memory Tag Cancel d Select Analog for Tag Data Type and click the OK button Memory Tag Properties Tag Data Type Tag Name Analog Setpoint O Discrete O Bit Array String Cancel National Instruments Corporation 7 33 LabVIEW DSC Module Course
45. the TCE in one of two ways You can display the Tag Utility toolbar by selecting Tools DSC Module Show Toolbar You also can open it directly by selecting Tools DSC Module Configure Tags The TCE loads the most recently opened SCF file created and then displays all tags in that file From there the Configuration Wizard is the quickest and easiest way to create tags For more advanced users you also can use the Create New Tags button to manually define the attributes of the tag LabVIEW DSC Module Course Manual 2 8 ni com Tag Configuration Wizard e Quickly creates tags e Automatically adds multiple items Adds range of addresses Determines the type of tag for you e Creates a tag name to match item name from the server E Select Items for Automatic Tag Generation kk JERSTRUMENTS Tag Configuration Wizard The Tag Configuration Wizard is the quickest way to create tags The Tag Configuration Wizard also allows you to customize the configuration of your tags so that you can maximize their functionality The wizard will list all the servers installed on the local computer Underneath the server there also may be a list of folders These folders contain the channel items The wizard allows you to add a single channel a range of addresses all channels in a folder or all of the channels on a server The Tag Configuration Wizard automatically determines the data type for the tags as w
46. the appropriate tags from the Tag pull down menu according to the following list e Numeric 2 Deadband 1 e Numeric 3 Deadband 5 e Slide Cooling Fan Control 12 Select File Save As and save the file as Deadband vi in the C Exercises LabVIEW DSC directory 13 Run the VI Adjust the cooling fan speed with the slider and watch the values update on the front panel Notice that Deadband 0 updates every second or two Deadband 1 updates a couple of times a minute and Deadband 5 rarely updates This VI demonstrates the importance of selecting a proper deadband If you use the 0 deadband you generate network traffic of 30 60 updates per minute and generate traffic even when the value has only changed by only a fraction of a degree which is wasteful Whereas if you use too large a deadband such as 5 you can miss large changes in temperature which makes for an ineffective control system Deadband 1 is a better choice in this case because it updates on small temperature movements but not on insignificant changes in temperature 14 In the bottom right corner of the screen right click the Engine Manager and select Stop from the shortcut menu as shown in the following figure v Show Details w Log Data w Log Events Print Events v Error Dialog Show Events 15 Stopping the Engine stops the VI 16 Close the VI Do not save changes End of Exercise 6 1 National Instruments Corporation 6 27 LabVIEW DSC Mod
47. the run which you want displayed The data set run appears in the Display tab National Instruments Corporation 5 7 LabVIEW DSC Module Course Manual File Add additional tags traces or data sets to this view New Trace View Measuren ent Automation Explorer Edit View Tools Help Select the Display tab to view the data set runs Zoom out to see rest of the data in the data set View other runs in the data set Tags configured for this data set Configuration E My System m Data Neighborhood m QQ Devices and Interfaces E Historical Data EL Citadel 5 Universe New Trace View m A Scales HA Software E IVI Drivers m Remote Systems h Export to Text Export to DIAdem View Data Set Run KCKKOCE P E 171072003 1 46 11 PM Centa Standard Tine in 1 01 46 10 PM 1 1 l 01 46 00 PM 01 46 05 PM MotoriPMSensor N MotofRPMSelPoint EJ Trace Properties Display ni com NATIONAL JF STRUMENTS EE Viewing Data Sets in MAX Part 2 of 2 The Display tab displays particular data set runs Use the Zoom feature to view the entire data set and other runs To view other runs individually click View Data Set Run Right click the graph legend to disable certain plots and so on You can access graph and plot properties by right clicking the plot area LabVIEW DSC Module Course Manual 5 8 ni com
48. this example the first thing this VI does is launch the Engine with a particular SCF file It is recommended that you have your program launch the Engine with a specific SCF file so that you are sure the correct SCF file is loaded It then waits five seconds to allow the engine to begin running This is where the code would execute that uses the first SCF file Then the Engine shuts down It waits for the shutdown to complete by using the Running output of the Engine Status VI After the Engine is no longer running it switches the SCF file This slide displays a dialog box to select the SCF file After selecting the new SCF file it restarts the Engine Note In order to switch SCF files you must stop the Engine You receive an error message if the Engine is still running You should not switch between SCF files frequently If you need to change SCF files the best time to do so is when the program is first starting Note Presently you cannot add or remove tags from an SCF file programmatically However you may load unload different SCF files with different numbers of tags You must also stop and then relaunch the Tag Engine to change the SCF file National Instruments Corporation 8 17 LabVIEW DSC Module Course Manual VI Based Servers For example okie Factory I Data Set Logger Demo Dunas Sarwa National Instruments DaqOpc National Instruments LookoutOPCServer National Instruments OPCDemo National I
49. up more space Also ensure that Log Resolution is set to something reasonable and not 0 0 Compacting the database often gets rid of any empty spaces that may have been created from deleting archiving and so on Based on your application a smaller value may be used for the Historical data lifespan Back up data when logging to a database Y ou can do this by archiving using DSC Module VIs or using MAX You can use the same tools to merge databases and also restore them It also is a good idea to compact data before archiving it The Archive Traces VI in LabVIEW DSC has an option to compact the database before archiving it You can archive entire databases individual tags and data sets not only locally but also on a remote computer on the network The same method merges or restores databases National Instruments Corporation 5 19 LabVIEW DSC Module Course Manual Exercise 5 1 Logging and Viewing Data Sets Objective To set up a data set and view it using several methods Configuring Data Set Logger 1 Select Tools DSC Module Configure Tags to open the Tag Configuration Editor Select File New to create a new SCF file Click the OK button 2 Select Edit Configuration Wizard to launch the Configuration Wizard 3 Navigate to National Instruments OPCDemo NI OPC Demo Server Simulation Select the MotorRPMSensor and MotorRPMSetPoint tags as shown in Figure 5 la Click the Add Item s button to add the tags then click the OK but
50. up to only write a new value if the value to write has changed In this slide the loop writes out 2 5 V once and then never writes again because the value to write would never change If the Generate Event input is true and event logging is turned on then an event is logged each time a new value is written to the tag LabVIEW DSC Module Course Manual 6 16 ni com How Timeouts Affect Tag VIs Timeout Choices Affect Program Execution Timeout 0 Read Tag is read immediately regardless of value change kaca Timeout 1 Read Tag is only read on value change in i Timeout X Tag is read on value change or after XX seconds ni com NATIONAL F STRUMENTS How Timeouts Affect Your Vis The choice that you make for your timeout values affects how your system functions The effect that the different choices will have is described below Timeout 0 With the timeout set to zero the tag is read immediately Regardless of what has happened to this value the value is read This increases network traffic because it requires the value to be read frequently even if the value has not changed at all Timeout 1 With the timeout set to 1 the tag is read only when the value changes more than the deadband This drastically reduces network traffic because the value is only updated when there is a different value to record This choice is referred to as event based Timeout X With t
51. want to Databases lt v a Expand Historical Data and select Citadel 5 Universe b Inthe Databases tab expand My Computer In the computer name folder select the trace that you want to view National Instruments Corporation 3 31 LabVIEW DSC Module Course Manual Click the View Data button on the toolbar d Click the Start Stop Logging control circled in the following figure to make sure the Green Light for Logging is selected e Make changes to the Fan Speed or Light Intensity on the Temp Chamber Ex 3 3 VI and view the data in MAX GE New Trace View Historical Data Viewer File View Tools Help ix My System FH Historical Data 2 Citadel 5 Universe e New Trace View B IVI Drivers LabVIEW DSC Module Course Manual E Trace Properties FE Display FE Add Remove Archive fhe Export to Text W8 Export to DIAdem 2 I4 4 gt gt l P Lo 11 25 2003 12 13 55 PM 11 25 2003 12 23 55 PM Central 200 ia Heat Lamp Thermocouple 35 20 4 I 12 20 PM 12 22 PM Aj gt 3 32 dide Help Back El y A Trace View Basics What do you want to do v Adda trace or data 3 Archive trace data ni com Part B Launch VI with Panel Wizard 1 Open the front panel from Part A 2 Modify the front panel by adding an OK button for the Historical Trend button shown in the following figure Rea
52. 0 05 seconds because this is how long your program may not receive CPU cycles from the operating system Giving some additional time for overhead 0 1 second update rates are about as fast as you can expect The group update rate is how fast the server updates the Tag Engine Both the update rate and the deadband are requests for a subscription from the OPC server The Tag Engine does not poll the OPC server Instead when a value changes more than the deadband the OPC server sends updates as interrupts to the Tag Engine at the requested rate It is not the rate of which the server reads values from the hardware You should not have your group update rate be faster than the sample rate or poll rate of the hardware If you do then you read the same value multiple times wasting the processor time of the computer LabVIEW DSC Module Course Manual 6 10 ni com Handling Large Tag Counts e Import export spreadsheet files Pak taa r Tab delimited text txt files Can be edited with any spreadsheet ipso application MS Excel Lotus 123 ie vn Taoss and so on Recent SCF Files e Import DAQ channels ES Use existing virtual channels ni com NATIONAL F STRUMENTS Handling Large Tag Counts Sometimes you do not want to add each tag used in your system manually Using the Import and Export functions provides the mechanism to import and export spreadsheet files containing tag configuration Exporti
53. 41C52F3671D Data set est 13 46 16 0x759FSDBCEAODA540 EER oi olo fT s GD WansahaiC__Piogram Files_Nalional_instruments_LabvIEW_7_0_datavData els Seiy Add Remove Selected Traces and Data Set Runs Full URL LaBVIEW_7_0_data DataBets SetY VOsDD2882F24501 LabVIEW _7_01 data D ataSets Sely VOx759F5DBCEAOL p I jets SetY 0x308AF41C52F31 6 Sansaha C_Program_Fil 7 ansaha _Pi aneaha LabVIEW MotofPMSetPoi Databases Trace View 4 sama JF STRUMENTS Viewing Data Sets in MAX Like alarms events and other historical data you also can view data sets Measurement amp Automation Explorer MAX To do so open MAX from the Start Menu or by selecting Tools DSC Module View Historical Data in LabVIEW Under Historical Data in MAX right click Citadel 5 Universe New Trace View Click the Add Remove button In the Add Remove Traces and Data Set Runs dialog box you can navigate to the data sets Unless changed this will generally be under My Computer Name of database DataSets if the database is on the local computer Click the data sets that you desire to display and click Add Notice that all the traces in the data set along with all the runs are listed following Click OK The Trace Properties tab now displays all the traces in the data set along with all the runs of the data set Click Add Remove to add or remove traces and data sets Click View Data Set Run and select
54. AQ Board gt lt Modules gt lt 7 NATIONAL JF NSTRUMENTS Typical Use Cases While the DSC Module can be effectively used in any VI to extend features of the VIs or to adapt the VI to hardware most uses for the DSC Module fall under at least one of the following types linked to your hardware HMI SCADA Systems You can quickly set up data analysis and indicators controls Programs that communicate with a variety of hardware The DSC Module allows you to interface with all hardware the same simplifying development and maintenance of your system abstract in the DSC Module you can hardware and change your hardware your data VIS needing to be maintained over multiple revisions Because hardware is kept add and remove features without affecting your implementation without affecting how you manage Quick flexible designs The DSC Module is designed to allow users to complete applications quickly and also customize their features to meet their needs National Instruments Corporation LabVIEW DSC Module Course Manual Where the DSC Module Fits in LabVIEW LabVIEW Vis Your Program DSC Module Log Data DSC Module Citadel andAlarms Tag Engine ea NI DAQ FieldPoint Driver Driver DAQ Board FieldPoint Modules oe NI or Third Party Drivers Third Party PLCs NATIONAL JF STRUMENTS Wh
55. AlertBrowser2 __ AddProcess Active Delete process i Disable the display created earlier Em A IAlertBrowser2 A TalertBrowser2 saf DeleteProcess URL gt Active Figure 4 2b Modify Block Diagram to Allow More Control over Alarm amp Events Display 9 Run the Exercise 4 2 VI and modify the light intensity and fan speed to vary the chamber temperature Switch to the Alarms tab to view the alarms Notice that the alarms display in red based on the level specified in the Tag Configuration Editor Right click the alarms to Acknowledge them from the shortcut menu You also can right click the display to set the Filter Options from the shortcut menu This allows you to limit which alarms are displayed 10 The Stop Alarm amp Event Display button stops and clears the alarm display To stop this VI completely click the main STOP button and the Stop Alarm amp Event Display button Optional View Alarms Using Alarm Summary Display Listbox You also can use the Alarm Summary Display Listbox located on the Controls Palette All Controls DSC Module Alarms and Events palette to display alarms The HMI Wizard must be used to display alarms Notice that not all the tags configured to log alarms are automatically displayed unlike the Alarm amp Event Display Instead you must specify which of the tags alarms you want to display End of Exercise 4 2 National Instruments
56. C Module Toolbar to provide meaningful graphics for your VI If a value is related to a particular hardware element you likely can find a graphical representation of that element in Image Navigator to use in your VI This also gives meaning to data and the overall purpose of a VI National Instruments Corporation 3 13 LabVIEW DSC Module Course Manual Panel Wizard Allows you to design Vls that call other Vis switch users or examine the values of the tags directly Simplifies the process of switching from one VI front panel to another VI front panel during run time e Creates layouts that more intuitive to use N NATIONAL INSTRUMENTS What is the Panel Wizard The Panel Wizard is a tool designed to eliminate much of the programming associated with incorporating multiple VIs or behaviors into one application When using the Panel Wizard create a button on your VI and the Panel Wizard can attach the desired behavior to that button The Panel Wizard generates standard LabVIEW code to implement that behavior Designing an application that can switch the current VI while running is normally complicated and a drain upon development resources Switching users during run time and launching the Historical Viewer also are useful However the Panel Wizard develops the code for you so that it behaves just as you want it without the need of programming it yourself Though code generated by the Panel Wizard is
57. ENTS Tag Permissions and Access Depending on your hardware you will be able to read from a hardware register write to a hardware register or read and write from a hardware register For example a hardware device reading a temperature might not allow a user to write a temperature value to the instrument Similarly a channel may allow a write but not a read for example an output channel generating a voltage Finally other data sources may allow reading and writing to the register Data representing a system status that you could read or set manually would be an example of this The type of access that a tag has will match the type of access that is appropriate for that hardware register If you have not already done so take a moment to review the Tag Access types shown in this slide The input output and I O tag access types all behave as expected from the VI point of view Thus while a piece of hardware might generate output this data is input into your VI and is then the Input type It causes an error to attempt to write a value to an Input or to attempt to read data from an Output However with the Input Output type you may do both The Memory type is a special form of an I O tag The memory type allows any operation that a standard I O tag does except that it is a value stored in the computer memory rather than retrieved from hardware This is useful for implementing an enhanced global variable or for testing your VI wit
58. EW DSC Module Course Manual gt gt gt Why Use the DSC Module e Develop and deploy HMI SCADA systems quickly e Maintain and adapt Vis to changing specifications Abstract the hardware so that users need not be hardware experts to retrieve data e Provides tools to quickly log secure or provide your data over a network ni com NATIONAL JF STRUMENTS Why Use the DSC Module In Your Applications The DSC Module is powerful enough to be the backbone of many applications specifically HMI SCADA systems The DSC Module provides tools to design a VI without having to place a single element on a block diagram Because the DSC Module abstracts the hardware you need not worry about the details of the hardware setup while you create your software application You can set up the hardware later or let an expert configure it Logging your data to a database preventing unauthorized users from accessing your data and sharing your data across a network can all be cumbersome tasks However the DSC Module provides features to handle this in your applications which reduces the work needed to a few mouse clicks LabVIEW DSC Module Course Manual 1 4 ni com Typical Use Cases e Control and monitoring applications Vis must be maintained over time e Quick flexible design required ni com Programs that communicate with a variety of hardware a EZ m FieldPoint Third Party 4 D
59. I Do not save changes End of Exercise 6 3 National Instruments Corporation 6 33 LabVIEW DSC Module Course Manual Notes LabVIEW DSC Module Course Manual 6 34 ni com Lesson 7 Networking with DSC TOPICS A Client Server Architecture Server Philosophy Review Client Philosophy Review DSC Module Clients Client Server Architecture Network System National Instruments Corporation 7 1 LabVIEW DSC Module Course Manual Client Server Architecture e Tag Engine accesses I O hardware using tags For example FieldPoint PLCs NI DAQ Server VIs client Vis and the database can access the Tag Engine for data e Local system client and server Vls access local Tag Engine JF STRUMENTS The client server architecture allows you to create programs that can access tags hardware to collect data from all different types of local and remote devices NI provides a full range of hardware solutions that integrate with the DSC Module to allow you to collect data With the NI Compact FieldPoint product line you can quickly use the DSC Module to configure I O tags to connect directly to analog or digital lines on the hardware With the DSC Module server VIs client VIS or the historical database can access the Tag Engine for data With a DSC architecture deployed on a local system the client and server VIs both access the same local DSC Module Tag
60. ID when it is written to the ID tag RPM Data Set ID Tag Figure 5 1f Frame 0 Write the ID Tag as Test HH24 MM SS Frame 1 shown in Figure 5 1g starts a new run by writing ON to the control tag RPM Data Set Run Tag At this time the Data Set Logger creates the start marker in the database The Run ID is whatever the current ID tag value is which is why it is important to initialize the ID tag before the run starts Writes ON to the control tag This will start the run i RPM Data Set Run Tag vf Figure 5 1g Frame 1 Write ON to the Control Tag to Start the Run LabVIEW DSC Module Course Manual 5 24 ni com Frame 2 shown in Figure 5 1h generates an array of values waveform and drives the setpoint tag In response the OPCDemo sets the value of the MotorRPMSensor Both values are displayed on the trend OODODOOOOODOOOODOOOZOOOOOOOOOOOOOOE Figure 5 h Frame 2 Write Values to the Setpoint Tag Frame 3 shown in Figure 5 1i contains a Wait function to allow some settling time Figure 5 1i Sequence 3 Allows Settling Time Frame 4 shown in Figure 5 1j ends the run by writing OFF to the control tag TEGOOOOOOOCO OOOOOOOOOOOOC Figure 5 1j Frame 4 Write OFF to the Control Tag to Signify the End of the Run Notice that no special VIs were used to manipulate the data set All manipulation is done through the ID tag and the control tag National Instrument
61. LabVIEW Datalogging and Supervisory Control Course Manual Course Software Version 7 1 July 2004 Edition Part Number 321367G 01 Copyright 1999 2004 National Instruments Corporation All rights reserved Under the copyright laws this publication may not be reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation In regards to components used in USI Xerces C ICU and HDF5 the following copyrights apply For a listing of the conditions and disclaimers refer to the USICopyrights chm Trademarks Citadel CVI DataSocket FieldPoint LabVIEW Lookout National Instruments National Instruments Alliance Program NI ni com NI DAQ NI Developer Zone and TestStand are trademarks of National Instruments Corporation Product and company names mentioned herein are trademarks or trade names of their respective companies Patents For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD orni com legal patents Worldwide Technical Support and Product Information ni com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 683 0100 Worldwide Offices Aus
62. Manual e Onthe Scaling Tab in the Scaling section set Full Scale to 200 and Zero Scale to 60 gt Analog Tag Configuration Setpoint_1 General Connection Operations Scaling Alarms Engineering Unit lt none gt v Scaling Scale Type lt none gt i Raw Scale __ Engineering Full Scale 200 00 200 00 Zero Scale 60 00 60 00 Coerce to Range LJ 3 Repeat the process for a second memory tag using instead the Tag Configuration Editor to create the Server Running tag a Select Tools DSC Module Configure Tags to open the Tag Configuration Editor i Tag Configuration Editor Temp Chamber scf LabVIEW ile Edit Tools Configure S Aaye i Nae Tag Name Create Tag Tag Group Data Type Tag Chamber Temperature Analog Input Cooling Fan Control Analog Input Out Heat Lamp Control Analog Input Out Setpoint Analog Memory LabVIEW DSC Module Course Manual 7 34 ni com b Click the Create Tag icon and create a discrete memory tag named Server Running Discrete Tag Configuration Server Running General Connection Operations Scaling Alarms EJ Name Group Description Tag Name Tag Group Tag Description Server Running Updates a memory tag when the server is running c The following tags should appear in the Tag Configuration Editor i Tag Configuration Editor Temp Chamber scf LabVIEW File Edit Tools Configu
63. Next click the Browse button on the top of the Trace Properties page Navigate under My Computer to the name and location of your database Select the Chamber Temperature tag and click the OK button National Instruments Corporation 4 27 LabVIEW DSC Module Course Manual 5 Inthe Trace Properties page change the trace name to Chamber Temperature and the min and max to 0 and 100 respectively as shown in the following figure Click the OK button Trace Properties a x 3 Database Version Cancel Help Name Chamber Temperature Trace Path MAE computef C__Exercises_LabVIEW_DSC_data LabVIE Browse Citadel 5 Citadel 4 a Event Trace Optional Trace Path Browse Min fo Max roo 6 Add other tags by following the previous steps and rename them accordingly On the NI HyperTrend Properties page click the Apply button then click the OK button 7 Click the Start Stop Plotting switch on the top right corner of the NI HyperTrend indicator The hypertrend is enabled when the switch is green The plot s should now appear in the hypertrend 8 Run the VI to see more recent historical data as it is logged Vary the light intensity and the fan speed and notice the temperature change Also notice that a trace is not logged if the value does not change This is the due to the deadband Tag values are logged only when they change by at least the amount of the deadband 9 Stop the Exercise 4 1 VI Notice
64. O O O O Instructor s presentation skills O O O O O Instructor s sensitivity to class needs O O O O O Instructor s preparation for the class O O O O O Course Training facility quality O O O O O Training equipment quality O O O O O Was the hardware set up correctly O Yes O No The course length was O Toolong O Justright O Too short The detail of topics covered in the course was O Toomuch O Justright O Not enough The course material was clear and easy to follow O Yes O No O Sometimes Did the course cover material as advertised O Yes O No I had the skills or knowledge I needed to attend this course O Yes O No Ifno how could you have been better prepared for the course What were the strong points of the course What topics would you add to the course What part s of the course need to be condensed or removed What needs to be added to the course to make it better How did you benefit from taking this course Are there others at your company who have training needs Please list Do you have other training needs that we could assist you with How did you hear about this course O NI Web site O NI Sales Representative O Mailing O Co worker O Other
65. ONAL F STRUMENTS Citadel LabVIEW and Your Data Examine this diagram again to better understand how Citadel integrates with LabVIEW and DSC Citadel is a stand alone component and as such it can log events even without any LabVIEW components running Citadel will log data and alarms from the DSC tag engine and make that data available directly to LabVIEW like MAX without going through other DSC components LabVIEW DSC Module Course Manual 4 4 ni com Storing Data with Citadel e Logs data tag values from tags that are configured to log values e Logs tag events alarms and so on from tags that are configured to log events e Stores data only on change quicker and requires fewer system resources ni com NATIONAL F STRUMENTS What Does Citadel Store Citadel stores a variety of information in its database Of course for tags that are configured to log their values Citadel will keep those in its database Events are logged in the same manner Events logged include any alarm state changes and any tag values changes made by the operator Citadel does not store data at selected intervals rather Citadel stores data only when it changes This allows Citadel to conserve disk space as storing the value of every point of data that changes only once a day would be rather inefficient You can configure how sensitive Citadel is to changes by adjusting deadbands which we will discuss later Data is l
66. OPICS A Understanding the Client Server Relationship B How Do I Use the HMI Wizard to Speed Development C Viewing Connections D Elements of an Effective User Interface E Panel Wizard TR JERSTRUMENTS By the end of this lesson you will be able to answer the following questions e Why does DSC use a server client architecture e How does a server client architecture speed up development of a LabVIEW DSC program e When must you expand the functionality of the Tag Engine and create your own server National Instruments Corporation 3 1 LabVIEW DSC Module Course Manual Understanding the Client Server Relationship e Server performs analysis and control e Server provides access to data e Client s and server are not necessarily on separate machines e Client server relationship is present in LabVIEW DSC Module N NATIONAL INSTRUMENTS Understanding the Client Server Relationship The client server design process is a key component of using the DSC Module The server consists of two parts the Tag Engine and a VI that contains additional programming for advanced analysis or control In many cases the Tag Engine provides all the functionality necessary for a server Even the simplest of applications use this functionality to some extent Generally a server acquires data from hardware through an OPC Server performs analysis and control and then makes it available to clients Clients rece
67. Running fF Fy 0 LabVIEW DSC Module Course Manual 7 36 ni com 4 Adda VI to the sequence structure to update that the server is not running a Place a Write Tag VI located on the Functions All Functions DSC Module VIs Tags palette on the block diagram b Right click the Tag Name input and select Create Constant from the shortcut menu Select the tag Server Running c Right click the value input of the Write Tag VI and select Create Constant from the shortcut Reset the Stop Button to Default False menu Server Running gt Dion ooo oo ooo 5 Select File Save As and save the VI as PID Server Ex 7 2 VI in the C Exercises LabVIEW DSC directory 6 Open the Tag Monitor Tools DSC Module Monitor Tags 7 Add each Tag to the Tag Window by double clicking the Tag w Untitled National Instruments Tag Monitor File View Items Options Help My Computer EE EEC CEE Re LabvIEW 1 9 robj LabVIEW Setpoint Setpoint 72 7272727273 12 19 2003 4 02 44 Good 1 9 Chamber T robj LabVIEW Server Ru Server Ru False 12 19 2003 4 03 13 Good 1 9 Cooling F 1 9 jrobj LabVIEW Heat tanh Heat Lamp 100 12 19 2003 4 02 45 Good 1 9 Heat Lam 11 9 robjiLabvIEW Cooling Fa Cooling Fa 0 12 19 2003 4 02 44 Good T gt iy 1 9 robj LabVIEW Chamber Chamber 0 10000000149 12 19 2003 3 13 16 Limit Exce 9 Setpoin amp My Network Place Object Name Clear User
68. SC Wizards Simply place a Waveform Chart upon your VI front panel right click it and select HMI Wizard You then can select which tags you would like to add to your chart and what scale and update rate you would prefer After you click OK your Chart is ready Like other code generated by the Wizards this code does come locked However it is not generally necessary to modify this code This is because modifying this code does not tend to yield the productive results that come with modifying code generated by other applications of the HMI Wizard National Instruments Corporation 4 9 LabVIEW DSC Module Course Manual l Using the NI HyperTrend Located in the Controls Palette All Controls DSC Module Trends e Right click and select NI HyperTrend Properties to add traces and so on I4 4 gt gt Il 2 3 4 2003120206 PM Central Standard Time 3 1 1 1 12 01 15 PM 12 01 30 PM 12 01 45 PM 12 02 00 PM yN NATIONAL INSTRUMENTS Using the HMI Wizard to View Historical Data The NI HyperTrend control allows you to easily view historical data from Citadel databases In order to display traces from the database place an NI HyperTrend control from All Controls DSC Module Trends Right click the control and select NI HyperTrend Properties to display traces Next click Add in the Channels Traces section of the Properties dialog box Select the database version Citadel 5 or Citadel 4 in the next dial
69. SC ZAC wadi OOO ook eos WE need aie vasa eu Vases ook O w ROA EA waka 7 32 EXCL CISC 2B ii ini AAA IAA E W AO WAN ORE OE 1 38 EXCTCIS Rotation nina sss sheev lh Gd R O Pa 7 41 Lesso 8 Advanced LOPICS nmin O PADA NOO O BW O teases annul ween E 8 1 Ay Dab VIEW DSC SCGUri ty ai ad di a A GA A AAA A AA 8 2 B Programmatically Controlling Security e sseus eau aaa aaa aaa aaa aaa aaa aaa aaa 0a 8 16 C VI BasEd Servers AA A AWA es A OEG aie Rh OO A i eed Tee 8 18 Exercise g lara a ANA ik ab oh toa de EA os ctv AEO ASY 8 22 EXETCISE 8 205 E dst a E Adi dA kiaad AE ania 8 27 Exercise Bgn W A O AA OO Pa R da i a AR 8 28 EXCTCISEO oi si NA Ad A ABC AOL A da Aika a ARE 8 30 Appendix A Additional Information and Resources 2e se sseuse aaa aaa aaa aaa aaa aaa aaa aaa aa aaa aaa aca A 1 Course Evaluation LabVIEW Real Time Course Manual iv ni com Student Guide Thank you for purchasing the LabVIEW Datalogging and Supervisory Control course kit This course manual and the accompanying software are used in the 2 day hands on LabVIEW Datalogging and Supervisory Control course You can apply the full purchase price of this course kit toward the corresponding course registration fee if you register within 90 days of purchasing the kit Visit ni com training to register for a course and to access course schedules syllabi and training center location information National Instruments Corporation v LabVIEW DSC M
70. Set Initial Value 0 00 Logging Data and Events J Log Print Events M Log Data Ba Deadband of range 1 Log Resolution engineering units 0 01 Cancel 3 Repeat step 2 if you also want to log the Fan and Light tags 4 Open the Engine Manager If it is not already running in the taskbar select Tools Launch Engine in the Tag Configuration Editor to start the Engine Manager If it is running in the taskbar double click the icon in the taskbar to open the Engine Manager zox gl8 2H Jappname scf LabVIEW SS Running Log Events Print Event Eror Dialog I7 Show Events National Instruments Corporation 4 23 LabVIEW DSC Module Course Manual 5 Make sure there is a checkmark in the Log Data checkbox in the Engine Manager Minimize the Engine Manager 6 Inthe Tag Configuration Editor select Configure Historical Notice the name and path of the database By default the database is stored in the data folder in the same directory as the SCF file You can change this to any other location or database name Notice that the default name is derived from the database path 7 In Tag Configuration Editor select File Save to save the SCF file If prompted shutdown and restart the Tag Engine 8 Close the Tag Configuration Editor Part B View Historical Data using HMI Wizard 1 Create a new VI Place a Historical Trend indicator located on the Controls Palette AII Controls DSC Module Trends pa
71. TRUMENTS How to Archive Data Using MAX MAX can be used to backup archive databases data sets or even individual traces Select MAX Historical Data Citadel 5 Universe to view all the databases stored Right click the database or data item to be archived and select Archive In the Archive Data dialog box add or remove databases data sets traces and so on that need to be archived Then click Next Next specify the destination database by navigating to it if it already exists Notice that a database on the network computer may also be selected If archive database does not exist you can create a new one by clicking the Create Attach Database Again you can create the new database on a network computer if proper permissions exist After specifying the destination archive click Next Select a Time Interval only if a specific interval of data is to be archived An option also exists to destroy source data after it has been archived You can enable the option when logging from a local computer This is an important option if you wish to delete the archived data from the source database destructive archiving as opposed to nondestructive archiving to reduce the size of the source database LabVIEW DSC Module Course Manual 5 14 ni com How to Backup Data Programmatically Programmatically archive data using the DSC Module VIs e Destructive or nondestructive archiving options Archive Traces time interval source database
72. Tags automatically update when added Right click a tag to write a new value write tags only e Great for debugging Tag Configuration Editor jedsdemo scf LabVIEW File Edit Tools Configure Servers Window Help Bela Se ZTEAFIEI S E EJ Tag Name 77 Untitled National Instruments Tag Monitor Dl x File View Items Options Help jO m FullNeme quality Readjwrte E B 10 0 35 167 His 67 FP ZAT 00 00 7 FPI3A0 0 0 5 32941462103 11 01 0 11 1 9 1410 0 35 167 FPI1TC 00 o0 82 8902723735 11 2 2003 9 56 59PM_ Good Read Only 58 PM Good Read Only 45 PM Good Read Wri te nobody L umf 4 Gi JERSTRUMENrS Tag Monitor Use the Tag Monitor to debug your application The Tag Monitor allows you to view all the tag values without having to do any programming You can start the Tag Monitor from the TCE by clicking the Start Tag Monitor button in the toolbar After the Monitor is running you can drag and drop tags from the left hand window pane into the right hand window pane After tags appear in the right hand window pane the values of those tags update automatically You also can write values to tags write tags only in the Tag Monitor by right clicking and choosing Write from the shortcut menu National Instruments Corporation 6 13 LabVIEW DSC Module Course Manual EE Programmatically Accessi
73. To examine a VI that uses programmatic login and logout OBJECTIVE Exercise 8 3 The objective of this exercise is to modify Temp Chamber vi to programmatically log a user in and logout when the VI finishes LabVIEW DSC Module Course Manual 8 14 ni com Controlling the Engine Engine Manager Window Start stop engine igix Enable disable logging View system events Running IV Log Data 7 Log Events I Print Events F Enor Dilog F Show Events loj gt d System Events Display ENT 11 24 2003 06 17 28 PM Historical data logging turned on VENT 11 24 2003 06 17 28 PM Event logging turned on ENT 11 24 2003 06 17 27 PM Dummy Server Launched ENT 11 24 2003 06 17 26 PM Configuration VI_Based Server scf oaded ENT 11 24 2003 06 17 26 PM Tag Engine Started VENT 11 24 2003 06 17 25 PM Tag Engine Stopped VENT 11 24 2003 Ot PM SCF file C Program Files National Instruments LabVIEW 7 0 I_Based Server scf was saved VENT 11 24 2003 06 12 24 PM Historical data logging turned on Controlling the Engine There are two ways to control the Engine The first is to manually select options as in the Tag Configuration Editor An interface exists for the Engine itself called the Engine Manager window In the Engine Manager window you have controls to stop or start the Engine enable or disable logging features and view a log of system events Note To access
74. URL source database URL out destination database URL destination database URL out tag names trace patterns all 9 p error out error in no error options How to Backup Data Programmatically Archive Traces VI Use this VI to perform an archival operation on a Citadel database Use the Alarm and Event Archive VI to archive alarm and event data by selecting Functions Palette DSC Module VIs Historical Data National Instruments Corporation 5 15 LabVIEW DSC Module Course Manual Backing Up Data Remotely For databases on remote computers the source and destination database URL path need to be in the following format computer_name local_drive path When you use the Path Control to browse to the directory you receive the computer name and the directory name source database URL C Program Files National Instruments LabVIEW 7 0 data Archive Traces vi lestination database URL backup c Documents and Settings user Desktop Sharediday1 RE JF NSTRUMENTS Backing Up Data Remotely When backing up databases to a remote computer on a network you must format the database URL properly In the case depicted in this slide backup is the remote computer that the local database is to be archived to This network computer has a shared folder called Shared containing a database called day1 If you browse to the remote computer on the network and point to the shared folder the URL wil
75. Uses client server architecture OPC server provided by hardware vendor Tag Engine acts as OPC client OPC Drivers OPC Enabled Device N NATIONAL INSTRUMENTS OPC Interface to the Hardware The DSC Module is an OPC client All hardware that communicates with the DSC Module must have an OPC server While deeply understanding OPC is not necessary when using the DSC Module you must know how the technology is used to provide functionality to you OPC stands for OLE for Process Control OLE stands for Object Linking and Embedding and is a set of driver specifications that is actively developed and maintained by a network of individuals and corporations The technology allows any piece of hardware to communicate with your computer in the same fashion regardless of how it actually behaves This flexibility allows a developer to be totally unaware of the intended hardware of a system simply using OPC to communicate where needed DSC takes this functionality and builds upon it to allow even greater flexibility through the use of tags As an end user OPC means that you have interoperability with different hardware vendors All of your hardware that supports OPC can be used from the LabVIEW DSC module even if it is not National Instruments hardware OPC is set up as a client server architecture The server s job is to talk to the hardware and provide data items to the clients The server is a complete piece of softwa
76. W DSC Module Course Manual A 2 ni com Appendix A Additional Information and Resources info labview Listserve info labview is an email group of users from around the world who discuss LabVIEW issues The list members can answer questions about building LabVIEW systems for particular applications where to get instrument drivers or help with a device and problems that appear To subscribe to info labview send email to info labview onalabview nhmfl gov To subscribe to the digest version of info labview send email to info labview digestalabview nhmfl gov To unsubscribe to info labview send email to info labview off labview nhmfl gov To post a message to subscribers send email to info labviewelabview nhmfl gov To send other administrative messages to the info labview list manager send email to info labview owner nhmfl gov You might also want to search previous email messages at www searchVIEW net e The info labview web page is available at www info labview org National Instruments Corporation A 3 LabVIEW DSC Module Course Manual Gourse Evaluation Course Location Instructor Date Student Information optional Name Company Phone Instructor Please evaluate the instructor by checking the appropriate circle Unsatisfactory Poor Satisfactory Good Excellent Instructor s ability to communicate course concepts O O O O O Instructor s knowledge of the subject matter O
77. Wizard Lock from the shortcut menu to disable the lock from the HMI Wizard Add a Stop button to the While Loop to enable you to stop the VI without aborting it TODODOOOOOOOOOOOOOOOOOOO0COOU fa 1 0 1 7 z OODOOOOZOOOOOOOOOO0OOOOOHW FE Find Wizard Control Database Path Release Wizard Loc D__Documents__ Files Eo True vh 4 1 94 DSC_Course_Content E _Project_Exercises_da 7 tast Porsa P Op Time i5000 gt gt Figure 4 1a Block diagram of Historical Trend VI 7 Right click the y axis of the trend and enable the autoscale option Save the VI as Ex 4 1 Historical Trend vi inthe C Exercises LabVIEW DSC directory 8 Open and run the Exercise 3 7 VI in the C Exercises LabVIEW DSc directory for a minute Change the heat lamp and fan settings to induce a noticeable pattern in the thermocouple readings 9 Stop the Exercise 3 7 VI and run the Ex 4 1 Historical Trend VI Notice that the historical data for the tags you specified is displayed You can add or remove any tags from the historical trend view in the HMI Wizard 10 Optional Run the Exercise 3 7 VI again Notice that the Historical Trend updates every 10 seconds with new data that is logged Part C Using Panel Wizard 1 Open the Exercise 3 7 VI if it is not already open and save itas Exercise 4 1 VI Click the Historical Data tab on the tab control on the front panel 2 Place a text button or any other Boolean control on this ta
78. a Optional Using MAX to View Data Sets You also can use MAX to view data sets 1 2 4 Open MAX or select Tools DSC Module View Historical Data in LabVIEW Under Historical Data in MAX right click Citadel 5 Universe and select New Trace View from the shortcut menu to open the Add Remove Traces and Data Set Runs dialog box where you can navigate to the data sets Unless changed this will generally be under My Computer Name of database DataSets if the database is on the local computer Click the dataset s that you want to display and click the Add button Notice that all the traces in the data set along with all the runs are listed below it Click the OK button End of Exercise 5 1 LabVIEW DSC Module Course Manual 5 26 Notes National Instruments Corporation 5 27 LabVIEW DSC Module Course Manual Notes LabVIEW DSC Module Course Manual 5 28 ni com Lesson 6 Maximizing Tag Effectiveness TOPICS A The Importance of Tag Management B Setting Default Parameters for Tags C Using the Tag Monitor Changing Tag Attributes Programmatically Lesson 6 Maximizing Tags Effectiveness At the end of this lesson you will be able to answer the following questions e Why is tag management important e What is deadbanding e How to edit specific attributes of tags How to programmatically read and write to tags in LabVIEW How to start the Tag Engine from LabVIEW National Instruments Corporatio
79. a aaa aaa n aaa E A aa E AA REST 5 10 C Importance of Archiving and Backing Up Data e se esse aaa aaa aa aaa aaa aaa aaa aaa a zaraza aazaaaca 5 13 D Merging and Restoring DatabaseS 2 e seeuas aaa aaa aaa aaa aaa aaa aaa aaa aaa raza aa aaa 5 17 EROLCISe Daa OOOO 5 20 Lesson 6 Maximizing Tag Effectiveness ccccccccssscssscesseeeseeeseesseeeseeescecsaecsaecaecesecnseenaeeseeeseeeseneesaeesaees 6 1 A The Importance of Tag Management cccccsccesscessceeeeeeneeeseeeseecseecsaecsaeceaecaecuaeesaeeseeeseeeeeneenges 6 2 B Setting Default Parameters for Tags 2ee eee aaa aaa aaa aaa aaa aaa aaa 6 8 GZOSUCECZK TY OO CE 6 13 D Changing Tag Attributes Programmatically 2 s u ss esse aaa aaa aaa aaa aaa aaa aaa aaa 6 22 Exercise Olne zi AA A ORA AO EE ola ee ae 6 25 EXGTCISE 622 ada E aa OO tw aaa za dana 6 28 ExX6rCISE 6 3 Oi Wa W A AO ad ROR W ndk 6 32 Lesson 7 Networking with DSC ae aiw W a a dk 7 1 Ay Client Server Architecture minner RP R OSA WO O O AO A A PA out OWA YO 7 2 B Server Philosophy Review cccccsccessessseeeseeeeeeseeeeeceecaecsseceseceseessecseeseeeeeeeesaecaecsecsseenaeeenaees 7 4 C Chent Philosophy REVIEW ai dk O O EENE EEE 7 9 Dz DSC Module Cheats zac aw RAP AA WaW nA Oda Osa 7 11 E Client Server Architecture Network System 2 e ss usenecie 7 12 Exercise Tel hinnen euch caus EO dO a OP ACE A a a tans eeest eat ages 7 28 EXOT CI
80. aa aaa awa 3 5 G MViewi g Coniiecti O S w suit ai OK ACE tka dolce A ROA A i 3 11 D Elements of an Effective User Interface e seu sea a aaa aaa aaa aaa aaa aaa aaa aaa 3 13 Es Panel Wi ardh swe zwa a O ot W AA aid adds O Ww Ad adr a T RAA ESTIS 3 14 Exercise ge tei ANA AAAA ONA A ROR cade es AAAA ORA PA divas hea AR Boeke 3 20 EXCL CISE 3 2 2h kia to O AE NA A OE A OOP OG code OR 3 25 EXCrcise 3 3 O ORO ROR TRZE 3 29 ExETCISE3 3B an az bees osek Genet dees R KAN ARA NE e O AA baa 3 33 Lesson 4 Handling and Logging Your Data ccccccsccssscesecessceseceeeceeeceeeeeseecsaecasecsaecesecsaeenseeseeeeneeenseeaes 4 1 A Logging Data Using the LabVIEW DSC Module e seeuse aaa aaa owane zaraza rawa aacaaaca 4 2 B Alarms in LabVIEW DSC eee eee aaa aa aaa aaa aaa aaa aaa aaa aaa aaa azer aaa aaa reaaa aaa 4 13 ExerCIsSE ASV A r R O O E A A OC A R ORA ee nado 4 23 D C C ERa a D a AEI ba Wad E GAR Pd OE anges 4 24 EXEL CISC Ae E EEE E A E E aa o O E AS 4 25 National Instruments Corporation iii LabVIEW DSC Module Course Manual ExerciSCZL D ta AZ A A ALENA ONO PO BAI NOAA 4 27 Exercise ATE w zi wid sida did iwa wid 4 29 OC GRZE OZ CERT 4 30 Lesson 5 Advanced Database Management seuse eau aaa aaa aaa aaa aaa aaa aaa aaa aaa aaa aaa 5 1 Ac What Ts a Data Seta tach wstawka O AG A Ri a R adel dea sient OE e aaa 5 3 B Keeping Your Database Slim ee eee oe aaa e
81. achine Interface e Gives instant access to values you need to read or write e Generates code on the block diagram to allow you to customize the behavior of the control indicator Good for simple applications or for a starting point for advanced applications NATIONAL INSTRUMENTS x HMI Wizard Included in the HMI Wizard are features for both the novice and advanced user The wizard is designed to help you make clear effective controls and indicators for your program The HMI wizard will create fully functional code However the generated code is editable so that you can add functionality to your VI The HMI wizard connects a control or indicator on the front panel to a tag For instance assume you have a tag labeled Tank Level that you want to monitor in LabVIEW After you place a Tank Numeric Indicator on the front panel the HMI Wizard quickly can create a VI that displays the value of Tank Level LabVIEW DSC Module Course Manual 1 12 ni com Tag Configuration Wizard P gt e Easiest and fastest tag creation e Automatically add multiple items or ranges of items Wizard determines the type of tag for you Wizard creates a tag name to match item name on the server x NATIONAL INSTRUMENTS Tag Configuration Wizard The Tag Configuration Wizard is the quickest and easiest way to create tags The wizard lets you pick tags from multiple sources For example you could select a tag from your
82. ag Name EB MH Click the symbol to expand the FP PWM 520 group Repeat the steps 4 20 to add Channel 0 and Channel 1 Click the OK button in the Wizard The names of your FieldPoint channels should appear in the Tag Configuration Editor Highlight the FP TC 120 Channel 0 in the Tag Configuration Editor and select Edit Edit Tag or click the Edit Tag button on the toolbar LabVIEW DSC Module Course Manual 2 22 ni com 24 Delete the current Tag Name and enter Chamber Temperature in its place Click the OK button Analog Tag Configuration Chamber Temperature fx General Connection Operations Scaling Alarms Name Group Description Tag Name Chamber Temperature Tag Group Tag Description 25 Repeat steps 21 and 22 for the other two tags using the following names e FP PWM 520 Channel 0 Heat Lamp Control e FP PWM 520 Channel I Cooling Fan Control 26 Select File Save AS name the file Temp Chamber scf and click the OK button If prompted to restart the Tag Engine select Yes to restart the Engine The black diamonds preceding your tags should disappear indicating that the tags are saved in memory 27 Close the Tag Configuration Editor End of Exercise 2 1 National Instruments Corporation 2 23 LabVIEW DSC Module Course Manual Notes LabVIEW DSC Module Course Manual 2 24 ni com EE Lesson 3 Designing Your LabVIEW DSC Application T
83. aintain This is especially true as the program grows to encompass multiple VIs LabVIEW DSC Module Course Manual 4 14 ni com Creating Alarms In the TCE select Edit Tag under the Alarms Tab e Check this box to enable alarms e Check which of the Alarms you would like enabled the limit and the priority 0 15 e Check here and enter a priority if you want an alarm generated if the tag read from the server has a bad status ni com General Connection Operations Scaling Alarms v nable Alarms Alarm Acknowledge Mode Auto Ack on Normal Alarm Deadband of range 1 Tag Yalue Alarms Enable Alarm Limit Priority V HI_HI 30 00 v Hl 75 00 LO 25 00 1 1 1 1 LO_LO 10 00 Alarm Message Bad v Enable Priority 15 NATIONAL F STRUMENTS Creating Alarms If the Enable Alarms box is unchecked then this tag will not generate any alarms and all other fields will be grayed out Alarms can automatically acknowledge themselves when the values return to the normal range or the alarm can persist until a user acknowledges the alarm Which is appropriate That depends on your application although a serious alarm should generally require user acknowledgement so that you can be sure someone has been warned that an alarm has occurred The alarm deadband is used to prevent an alarm from cycling on and off if the tag value is oscillating abo
84. al Names Users and Groups Description a Operators Members granted general access to the system G Everyone System Operators Members granted system level access to the syster G Guests Members have guest access to the system G Administrators Members can fully administer user accounts 2 Engineers Members have access level 8 D Guy D Rick D Guest Built in account for granting guest access to the sy x Names to Add zc o Access Rights Cancel Help 18 Select Tools DSC Module Monitor Tags to launch the Tag Monitor Because you are logged on as Administrator you should be able to launch the Tag Monitor successfully Close the Tag Monitor and log on as Guy Because Guy is a member of the Operators group the access should be denied National Instruments Corporation 8 25 LabVIEW DSC Module Course Manual When you restarted LabVIEW you were automatically logged on as an Administrator In this section you will configure LabVIEW to always launch with a login window 19 Select Tools DSC Module Options and click Security Preferences on the Advanced tab to open the Security System Settings dialog box 20 Make sure Show the login prompt at LabVIEW startup time is selected Click the OK button twice to close the dialog boxes and return to LabVIEW gt Security System Settings XI Startup Advanced ie r s r r Show the login prompt at LabVIEW startup time Login automatically with
85. al 1 14 ni com Real world data is sampled by your hardware ni com How Does Data Get to the Tag DSC Module Tag Engine reads values from your hardware DSC Module Tag Engine oa Tag Engine updates tags in your Vis NATIONAL JF NSTRUMENTS How Does Data Get to My Tag Examine this diagram Data travels from the real world to the tag in your VI in the following way e The hardware collects data from the real world e The DSC Module Tag Engine reads values associated with tags from the hardware The Tag Engine then updates the values in your VI This can occur upon changes in the value or based on user defined timings The reverse process is used when updating write tags National Instruments Corporation 1 15 LabVIEW DSC Module Course Manual NI FieldPoint Overview Modular Distributed I O System e Modular e Network Wireless Stand Alone e Industrial e Environmentally Rugged e Easy to Use NATIONAL INSTRUMENTS NI FieldPoint is a modular distributed I O system with industrial grade performance and unmatched software integration The system gives you the ability to quickly and easily place I O and measurement nodes near sensors and signal sources FieldPoint also gives you the flexibility to choose a standard networking technology such as Ethernet serial wireless or Foundation Fieldbus that best suits your application The c FP 20xx Ethernet contro
86. al 8 28 ni com 3 Modify the block diagram as shown in the following figure Controls the brightness of the LED that simulates the Light Intensit R Place an NI SEC Programmatic Logout VI on the block diagram and wire the error out cluster to the left hand side of the top While Loop 5 Place another NI SEC Programmatic Logout VI in the Sequence Structure on the right side of the block diagram 6 Add a Case structure inside the top While Loop and connect the Log in button to the case selector input x Place an NI SEC Invoke Login Dialog VI inside the true case of the Case structure 8 Run the VI Notice that the controls are disabled and grayed out when the program begins running Try logging in by clicking the Log in button Log in as Administrator End of Exercise 8 3 National Instruments Corporation 8 29 LabVIEW DSC Module Course Manual Optional Exercise 8 4 Using a VI Based Server to Create a New Tag Objective To modify and run a VI based server example to create a new 1 0 tag Create a VI that writes and reads from this tag 1 Select Help Find Examples to open the NI Example Finder 2 Make sure you are on the Browse tab and select Toolsets and Modules Datalogging and Supervisory Control Servers and open the Register Dummy Server VI 3 Open the block diagram and examine the code This VI writes to the CCDB Common Configuration Database that the Tag Configuration Edi
87. an share this folder with other users on your S ha rea nd se le ct Cn Search Z network To enable shang for this folder clck Shae tis i a SUI O Do not share this folder S h arin g an d Se curi ty F U Scan for Ghare this folder i R Oj nicz e ecm 3 Click Share this Folder DAddto Exe Comment Qs Send To User limit Maximum al lowed 4 Click Permissions 4 ct O Allow this number of users Copy add users and access rights 5 Click OK To set permissions for users who ace Ss folder aver the network click Permissiol onligure settings for offline access click Toc Cachina aching OK Cancel Apply NATIONAL JE STRUMENTS Sharing Windows Directories To use remote networked clients you must share the directory where the SCF file exists so that you can import network tags Importing Network tags is explained in the coming slides To share a Windows directory double click My Computer and find the folder you would like to share Then right click the folder and select Sharing from the shortcut menu If this menu is not available you must enable sharing in the Windows network control panel You then can enable sharing by clicking the Share As tab You also need to add users and access rights so that you can control who can read write to the shared folder Click Add to add users or groups of users and their access rights After you have added all of the users for the folder click OK Depending on your ne
88. are some methods of viewing historical data alarms and events from the database NATIONAL JERSTRUMENTS Summary How do I make sure that tag data and events are logged Log Events must be checked in the Engine Manager Tags must be configured to log data in TCE e When is a tag logged When its value changes more than the deadband e How is deadband calculated As a percentage of the scale in the tag s Scale tab e What are some methods of viewing historical data alarms and events from the database HMI Wizard HyperTrend MAX Historical Data VIs Alarms amp Events VIs and Alarm amp Event Display front panel control LabVIEW DSC Module Course Manual 4 22 ni com Exercise 4 1 Logging and Viewing Data Sets Objective Explore various options available to view your logged data Part A Configure tags and engine to log data 1 Open a blank VI and select Tools DSC Module Configure Tag to open the Tag Configuration Editor 2 Double click the Chamber Temperature tag and select the Operations tab in the Tag Configuration Editor In the Operations tab make sure there is a checkmark in the Log Data checkbox to ensure that the specified tag will be logged in the database Leave the Log Deadband and Log Resolution as default and click the OK button I Analog Tag Configuration Chamber Tem General Connection Operations Scaling Alarms Engine Update Deadband of range 0 1 7
89. ark in the Enable Alarms checkbox Modify the remaining parameters as shown in Figure 4 2a Click the OK button Repeat this step to set alarms for other tags gt Analog Tag Configuration Chamber Tempe General Connection Operations Scaling Alarms v Enable Alarms Alarm Acknowledge Mode Auto Ack on Normal gt Alarm Deadband of range 1 r Tag Value Alarms Enable Alarm Limit Priority I HI_HI 115 00 8 Iv HI 90 00 6 Iv LO 75 00 1 r LO_LO 0 00 1 Alarm Message Bad Status Alarm MV Enable Priority 15 Cancel Figure 4 2a Configure tags to log alarms Save the SCF file and click Yes when prompted to update the Tag Engine Minimize the Tag Configuration Editor to return to Exercise 4 2 VI Click the Alarms tab on the tab control Place an Alarm amp Event Display located on the Controls Palette All Controls DSC Module Alarms and Events palette on the front panel Resize the display to fit in the tab page Place a Text Button on the same tab page to control the Alarm amp Event Display Label the button Stop Display LabVIEW DSC Module Course Manual 4 30 ni com 8 Open the block diagram and notice the code that is generated Modify the code as shown in Figure 4 2b so you can control the start and stop the Alarm amp Event Display Alarm amp Event Displa R t IAlertbrowser2 Bl IAlertBrowser2 RE u e I
90. arly in your development ensures that an improper setup does not cause hard to detect bugs in your VIs The easiest way to check your hardware is to use the Server Explorer Server Explorer is a generic OPC client that is designed to allow you to check that your hardware is connected properly and that you are reading the correct data from it After launching Server Explorer a list of OPC servers appear representing the hardware Select the proper server right click and choose Wizard The OPC Wizard appears Click Next to connect to the server Upon connecting the OPC Wizard prompts you for a Group Name and Update Rate For testing you usually can leave these values at their defaults From there you will see two lists of items The list Selected OPC Items represents the data in which you are interested in testing The left list indicates the remaining items that you may add In general you should only select those items you are interested in testing as your hardware will frequently have more items available than you are interested in Instructor Note Demonstrate the Server Explorer by using the Wizard on the OPCDemo server Note Self Paced Explore the Server Explorer by using the Wizard on the OPCDemo server Verify you can read data from the server National Instruments Corporation 2 5 LabVIEW DSC Module Course Manual San ni com LabVIEW DSC and OPC Pa na ale NE FieldPoint I O Modules OPC N
91. ase tree and delete the data from the database Ca Deleting Data Delete Traces VI Use this VI to delete a set of traces from a given Citadel database You cannot recover data deleted with this VI cannot be recovered In MAX right click the tag data set run data set or database you want to delete Select Detach Delete and in the next dialog box select Delete and click OK LabVIEW DSC Module Course Manual 5 18 ni com Summary What is a data set What is a run What are some methods to read a data set What are some methods to reduce the amount of disk space used by a database What are some methods for backing up data ni com NATIONAL JF STRUMENTS Summary A data set is a group of tag values that are logged together for some finite amount of time You can log data sets by simply logging to any one of the tags that is contained in a data set Because a data set logs all the tags in it for a fixed amount of time each time that data is logged for a certain period of time to the data set it is called a Run Each run has its own ID Tag that can be used to retrieve data from that run directly Data logged in a data set can be displayed and read using the DSC Module VIs or using Historical Data in MAX You can reduce the database size by making sure that the Logging Deadband is not too small If it is too small then data is logged more often thus taking
92. ation DDE Server Configuration Remote BridgeVIEW Configuration Start when Discrete Tag ON x Tag Si National Instruments DaqOpe Configuration End when Discrete Tag OFF x Tag 5 ni com Setting Up a Data Set In order to set up a data set first the desired tags must be configured using the Tag Configuration Editor After the tags have been configured save the SCF file and restart the Tag Engine Then select Servers Data Set Logger Configuration In the Definition tab create a set with a unique Data Set Name The ID Tag stores the ID of each run of data set that is stored The Start when and the Stop when parameters are the control parameters that dictate when the data set is logged and when the logging is stopped You can configure this to be based on a control tag usually a Boolean tag Whenever the control tag is ON the Data Set Logger logs the start marker and logs the end marker when it goes OFF You must specify tags to be included in this data set need in the Tags tab Note If the tags from the TCE do not appear in the Data Set Logger Configuration dialog box resave the SCF file and restart the Tag Engine After you create and configure the data set you can log it programmatically You also can toggle the control tag programmatically to begin and end logging the data set Each time the data set is logged they will be assigned a unique ID Tag If five runs are made each run has i
93. ause the client uses the Tag Engine you must have a DSC Module run time system installed You can build an executable with the Application Builder but it must be placed in the DSC module run time folder with DSCengine exe on the client PC LabVIEW DSC Module Course Manual 7 12 ni com Benefits of Transparent Server Access Use the same server and client Vis on networked machines Import networked Tags into SCF File e Client can access the same database and read data e Control security settings for your server Make remote tags transparent to HMI Wizard DSC Module Client Machine DSC Module Server Machine Must Have DSC Module Runtime system installed The DSC Module simplifies deploying server and client VIs With the DSC Module you can use the same VIs on the local machine and the networked machine The Tag Engine on the local machine communicates transparently with the Tag Engine on the networked machine Also client VIs on the network machine can access the database when folders are shared on the local machine and read data One of the most important features is that Remote Tags are transparent to the HMI Wizard and allow client VIs to simply communicate to networked tags over the network National Instruments Corporation 7 13 LabVIEW DSC Module Course Manual gt gt gt Configuring Client Machine Install LabVIEW DSC Run Time Engine on Client e Test the Network Browse for Available Netwo
94. b page National Instruments Corporation 4 25 LabVIEW DSC Module Course Manual 3 Right click the Boolean control and select Panel Wizard from the shortcut menu Configure the Panel Wizard as shown in Figure 4 1b Click the Browse button and navigate to C Exercises LabVIEW DSC Ex 4 1 Historical Trend vi Click the OK button IS Temp Chamber Ex 4 1 vi Front Panel 3 File Edit Operate Tools Browse Window Help Real Time Data Historical Data Historical Trend 1 Visible Items gt xj Frdtemna Change to Indicator With this control Open a Panel v c Description and Tip Panel Button Polling ee Create gt 7 Replace KEG Data Operations b Historical Data Viewer Advanced gt Tag Monitor VI Path to VI D Documents amp Files D5C Course l Browse R a mi Content Project Exercises Historical Release Text Trend vi I Relative path Properties Figure 4 1b Configuring the Panel Wizard 4 Open the block diagram and examine the code generated by the Panel Wizard Modify the block diagram as shown in Figure 4 1c so you can stop this loop with the same stop button that stops the other loops SOO nn II OO D Documents amp Files DSC Course Content i Wizar d SE Project Exercises Historical Trend vi Release Wizard Loc Figure 4 1c Edit Block Diagram to Stop VI with One Stop Button LabVIEW DSC Module Course Manual 4 26 ni com 5 On the front pa
95. cesses more disk space if necessary for storing logged data JF NSTRUMENTS Importance of Archiving and Backing Up Data Archiving or backing up data is essential when dealing with data logging Because you can log data over long periods of time you might need to back it up frequently to protect it against unforeseen computer failures or hard disk corruptions You also can store data on a remote location or storage device such as a floppy disk a tape drive and so on Remote storage of data ensures that a redundancy is in place to protect data against unexpected vulnerabilities National Instruments Corporation 5 13 LabVIEW DSC Module Course Manual gt gt gt How to Archive Data Using MAX Use MAX to archive entire databases data sets or individual traces Citadel 5 Universe Measurement amp Automation Explorer loj xi File Edt View Tools Help Configuration A viewData 2 Refresh 7 Options gt Show Help EQ my System T T E Universe Bl Data Neighborhood T My Computer ansahaj GB Devices and Interfaces i a b Computes aae EMER Historical Data G E Citadel 5 Universe lt b New Trace View 3 Ba Scales DetachjDelete BJ Software H Test 13 45 39 0 Expand All D M1 Drivers Gb Test 13 45 56 0 Collapse All Remote Systems 6 ansaha C__Program_Files_National_Instruments_LabVIEW_7 _0_data Databases T JF S
96. ch user gets logged in when LabVIEW initially starts up For example if you are developing a system you may want to have the system automatically log you back in the next time you restart You can implement this using the Security Preferences settings Here you can configure the DSC module to automatically log in or prompt a specific user to log in at startup National Instruments Corporation 8 5 LabVIEW DSC Module Course Manual Tools Access You can restrict access to any of the DSC tools to certain users or groups TagMonto ServerBrowser StatupVis Server Tester Tag Configuation Edter TagEngine Historical Trend Viewer i 4 Envionment Startup Advanced J Preload tag editor when LabVIEW starts JZ Close Tag Monitor when LabVIEW exits Close Image Navigator when LabVIEW exits System Log C Program Files National ae 4 Instruments LabVIEW 7 0 I zi 5 Use default location Proxy User Engine User Tools Access The LabVIEW DSC module allows you to control who can use the development tools like the Tag Configuration Editor the Tag Monitor and so on By default all users have full access to all tools LabVIEW DSC Module Course Manual 8 6 ni com Exercise 8 1 Creating Accounts and Security Options Approximate time to complete 15 min Page 8 22 To create user accounts and configure security settings OBJECTIVE Exercise
97. change anything on the diagram The Security Wizard The DSC Module provides an easy way to implement security within your applications through the Security Wizard The Security Wizard allows you to restrict access on controls and indicators to specific groups or users To use the Security Wizard right click a control or indicator and choose Security Then configure the access rights for the users or groups that you wish The security wizard makes it easy to implement security at any time during the development of your application You can easily add security to a standard LabVIEW VI without having to change the code of your VI LabVIEW DSC Module Course Manual 8 10 ni com Exercise 8 2 Incorporating Interface Security into a VI Approximate time to complete 15 min Page 8 27 To add security to an existing VI using the Security Wizard OBJECTIVE Exercise 8 2 The following are the objectives of this exercise To familiarize yourself with the addition of security to a pre existing VI To load a client VI To prevent operators from changing a switch but allow them to see the switch To allow all engineers or administrators full control over the switch National Instruments Corporation 8 11 LabVIEW DSC Module Course Manual Programmatically Controlling Security These Vls allow you to do the following e Login Logout sc bd Change passwords NI SEC Interactive User Info vi a
98. change tag attributes programmatically Using the VIs on the Tag Attributes Palette allows you to change almost any aspect of a tag while your program is running For example this allows you to change limit levels to turn alarms on and off and to control data logging without any human interaction In addition to changing attributes programmatically you also can retrieve attribute information programmatically Y ou can implement features that allow users to bring up the current tag configuration while the program is running LabVIEW DSC Module Course Manual 6 22 ni com l Examples of Programmatic Changes e Front panel control example User can choose the tag the tag attribute Tag Name eee Front and the new value peed Panel Can be done while the program is running IA Control e Block diagram control example Ee chamber Temperature T The programmer can set new attribute may es values from the block diagram pis Daan Changes can happen automatically Block with no user interaction IE Diagram 5a Three examples turn data logging on off iene ttle Control turn alarms on off and adjust the update deadband of a tag ZIE Update Deadband Set 2 og Data DBL ni com NATIONAL F STRUMENTS Examples of Programmatic Changes In the example in this slide the first all
99. clients to change control settings for example PID gains Display necessary information JF STRUMENTS This slide lists some common features that might appear in a Server VI The first advanced feature might be code necessary for implementing certain control algorithms or logic Also you might add additional code that can analyze program results and then generate an output response Additional features might include a Tag that all clients can monitor to see if the server is running or the addition of memory tags to the server so a client can modify setpoints as well as settings for the control response and outputs that display relevant information for the operators National Instruments Corporation 7 5 LabVIEW DSC Module Course Manual PID Control Toolkit e Integrates with DSC Module Features include the following applications Autotuning to improve e Included with Professional performance of PID control Control Edition Fuzzy logic tools for complex systems Fuzzy logic control designer P PI PD and PID control algorithms Graphical development of control algorithms JF NSTRUMENTS The proportional integral derivative PID Toolkit is an add on toolkit for LabVIEW that adds PID and fuzzy logic control VIs The PID Toolkit integrates easily with the DSC Module to allow users to add advanced control features to a DSC Module server application The PID Toolkit
100. corresponds to one run As you can see from the picture the database stores three runs The IDs are Run 1 Run 2 and Run 3 The DSC Module provides functionality to retrieve data from the database based on a run ID which means that you do not have to remember what time the tests were executed or how many tests have been executed The Data Set Logger logs all this additional information to the historical database With a single VI the List Data Set Runs VI you can retrieve the list of runs With another VI the Read Data Set Run by ID vi you can retrieve data from that run National Instruments Corporation 5 3 LabVIEW DSC Module Course Manual Setting Up a Data Set 1 Create tags in Tag Configuration Editor save SCF and restart Tag Engine To open the TCE from LabVIEW select Tools DSC Module Configure Tags 2 Add tags to data set using Data Set Logger Configuration from within the TCE select Servers Data Set Logger Configuration 3 Create a tag connected to one of the items in the Data Set Logger Tag Configuration Editor default scf Lab IE o1xi File Edit Tools Configure EM Window Help BAE m Refresh lt A Server Explorer Definition Tags Advanced MotorRPMSensor Server Browser MotorRPMSetPoint Browse Network OPC Servers Set ID Tag Set Run Tag Data Set Name Set ID Tag Set ID Tag Data Set Logger Configuration Description DataSocket Configur
101. creating a large number of tags this is a good way to save time If you have different sets of tags that need different default values set the default values and create the first set of tags Then change the defaults and create the second set of tags Tip If you need to know what some of the terminology means within this window use the Online Help feature lt Ctrl H gt to launch the Help window You then can view information for each field as you hold the cursor over a field LabVIEW DSC Module Course Manual 6 8 ni com E FP 6 10_0_35_167 A G FP4Al 110 62 n Set Tag Defaults Using Ranges of Values in Tag Configuration Wizard gt Select Items for Automatic Tag Generation AB Al 7 Changan First Item Name FP 10 0 35 167 FP A1 110 2Al Create This Many Items 1 ni com Cancel Allows multiple related tags to be created at one time e Speeds development NATIONAL JERSTRUMENTS Adding as Range Some items in the Tag Configuration Wizard have channel lists that include a range of addresses The Add as Range button allows you to select a starting address and a number of items to create The wizard then automatically generates all of the addresses and increments the tag names For example if you chose the First Item Name as Example Tag and chose to create three Items you create tags named Example Tag0 Example Tagl and Example Tag2 For driver
102. ds Fields to Export Tag Name Data Type Tag Description OK Add gt gt Tag Group Cancel Tag Access Delete Server MoveUp ltem All gt gt ltem Access Path Move Down Length 140 Group Default Ord x 140 Group Description gt a a di LabVIEW DSC Module Course Manual 6 28 ni com 10 Select Start Programs Microsoft Excel to launch Excel 11 In Excel select File Open change the Files of type field to Text and navigate to large txt and click the OK button to open the file open 21x Look in lt Local Disk C te AXE Tools 7 Documents and Settings Lotus Program Files Random Installs 3 xXIpnp COMLOG txt Type Text Document Date Modified 1 19 2004 7 57 PM Favorites Size 6 50 KB EJ or File name Open My Network E Places Files of type Al Files M Cancel National Instruments Corporation 6 29 LabVIEW DSC Module Course Manual 12 The file is tab delimited by default so click the Finish button to load the file 13 For tags 40500 41000 change the Raw Full Scale to 20 and the Raw Zero Scale to 4 the Eng Full Scale to 100 and the Eng Zero Scale to 100 and change the Scaling field to Linear Edit the first tag and then use copy and paste Notice that Window Split can be useful when working with such a large spreadsheet 14 For tags 50 100 invert the logical scaling by changing the sca
103. duction course In addition you should be familiar with the Windows operating system and computer components such as the mouse keyboard connection ports and plug in slots and have experience writing algorithms in the form of flowcharts or block diagrams The course is divided into lessons each covering a topic or a set of topics Each lesson consists of the following parts e An introduction that describes what you will learn e A discussion of the topics e A set of exercises that reinforces the topics presented in the discussion e A summary that outlines important concepts and skills taught in the lesson C What You Need to Get Started Before you use this course manual make sure you have the following items Q Computer running Windows 2000 XP Q LabVIEW Full Development System version 7 1 or later Q LabVIEW Datalogging and Supervisory Control Module version 7 1 or later LJ One of the following Real Time target computers FieldPoint 2000 or 2010 network module with a FieldPoint PWM 520 module and terminal block and a FieldPoint TC 120 module and terminal block UO LabVIEW Datalogging and Supervisory Control Course Manual National Instruments Corporation vii LabVIEW DSC Module Course Manual Student Guide OU LabVIEW Datalogging and Supervisory Control Course CD which contains the following files Filename Description Exercises a folder containing all files needs to complete the exerci
104. dule Course Manual 3 34 ni com e Click the OK button The Panel Wizard generates the following code 4 Open the block diagram and modify the code a Delete the True constant Replace it with a copy of the Stop local variable b Change the conditional terminal to Stop if True 5 Save the VI End of Exercise 3 3 National Instruments Corporation 3 35 LabVIEW DSC Module Course Manual Notes LabVIEW DSC Module Course Manual 3 36 ni com Lesson 4 Handling and Logging Your Data TOPICS A Logging Data Using the LabVIEW DSC Module 1 Logging to a Database 2 Viewing Historical Data B Alarms in LabVIEW DSC 1 Creating Alarms 2 Programmatic Access to Data and Alarms By the end of this lesson you will be able to answer the following questions Why is it important to log my data What is Citadel How does Citadel help me manage my data How can I view and analyze previous values of my data What is an Alarm How can I configure Alarms to automatically perform basic analysis of data How can I incorporate Historical Data and Alarms directly into my program National Instruments Corporation 4 1 LabVIEW DSC Module Course Manual Logging to a Database 1 Tag Engine acquires data from OPC Server 2 Tag Engine sends data to Citadel database 3 Citadel determines location and stores the data 4 Citadel then makes this database available to various LabVIEW tools Historical Data Viewer and MAX Note
105. e and Lookout the database networking protocol and security systems are identical between the two packages This assumes that you use the same versions of Citadel Lookout and the DSC Module need to either both use Citadel 4 or Citadel 5 Interoperability is easy between Lookout and the DSC Module When creating a Lookout client program it is as if the DSC Module server was a Lookout server with the process name LabVIEW You can even browse to the tag entries for the DSC Module in Lookout Because the DSC Module is performing the data acquisition you do not need an I O point license for Lookout You need a Lookout development system to create the client process but you can run the client process using the runtime client version or the Lookout Web client Refer to ni com lookout for more information on Lookout LabVIEW DSC Module Course Manual 7 24 ni com Remote Citadel Logging Select Configure Historical or Events gt Historical Logging Configuration xl Log to Computer JREmoTE_COMPUTER Browse Data Directory c scada data i 7 Store absolute path IV Start logging on system start up 7 3650 Days to keep historical data 1 00 00 Maximum time between logs hh mm ss Lick cma Remote Citadel Logging The DSC Module can now log data to a remote database located on another computer on your network This is achieved by going to the Configure menu in the Tag Configuration Editor and choosi
106. e name Fieldpoint Temperature Chamber Save as type FieldPoint Configuration File iak v Cancel National Instruments Corporation 2 21 LabVIEW DSC Module Course Manual 14 15 16 17 18 19 20 Close MAX Open LabVIEW Click the New Button select Blank VI from the menu and click the OK button Select Tools DSC Module Configure Tags to open the Tag Configuration Editor Select File New and click the OK button to create a new file in the Tag Configuration Editor Select Edit Configuration Wizard or click the Configuration Wizard button on the toolbar to open the Configuration Wizard Click the symbol to expand the National Instruments OPCFieldPoint group Click the symbol to expand the FP YOUR_IP ADDRESS group Click the symbol to expand the FP TC 120 group Select Channel 0 and click the Add Item s button to add the channel Select Items for Automatic Tag Generation 21 22 23 Selected Items National Instruments D aqOpe FP 10_0_34_164FP TC 120 1 Channel 0 National Instruments Lookout0PCServer National Instruments OPCDemo Add Item s gt gt National Instruments OPCFieldPoint CJ FP 10_0 34 16 Add as Range FP 2000 G0 H FP FPwM 520 2 a FP TC 120 1 M All Emu we Channel 1 AJ Channel 2 A Channel 3 A Channel 4 ae Channel 5 A Channel 6 ltem Properties A Channel 7 Server Name AJ LJ Temperature nm ee T
107. e names from a Citadel database based on a particular pattern Write Traces to Spreadsheet File VI Use this VI to convert a set of historical trends to the tab delimited spreadsheet string format and store it in a file which spreadsheet programs can read Delete Traces VI Use this VI to delete a set of traces from a given Citadel database Data deleted with this VI cannot be recovered Additional details on each of the above functions can be found in the Context Help and the LabVIEW Help LabVIEW DSC Module Course Manual 4 20 ni com Using the Alarm and Events VIs in alarm alarm ack alarm value alarm timestamp alarm state error colors acy display Format database URL filter tag name timeout secs 0 timeout s 30 error in no error table or multicolumn listbox shutdown changed alarm message Read Tag Alarm vi Alarm amp Event Query vi group tag names read parameters alarm summary status error shutdown read parameters y initialize headers group tag names column headers Get Alarm Summary Status vi timeout secs 1 history data Format row colors color codes tex alarm summary status buffer size 10 error group tag names esoesoe shutdown ack alarm T error changed shutdown Acknowledge Alarm vi Read Event History vi JERSTRUMENTS Using the Alarm and Events VIs Read Tag Alarm VI Use this VI to read detailed alarm status fo
108. e shutdown Always d Click the OK button The Panel Wizard generates code LabVIEW DSC Module Course Manual 3 30 ni com 5 Open the block diagram and view the code generated by the Panel Wizard 6 Modify the code to allow the user to stop the While Loop Right click the While Loop and select Release Wizard Lock from the shortcut menu b Copy the Stop local variable from another While Loop and replace the True False constant with this local variable c Right click the conditional terminal and select Stop if True from the shortcut menu 7 Savethe Vlas Temp Chamber Ex 3 3 vi inthe C Exercises LabVIEW DSC directory Run the VI 8 Display the front panel and run the VI 9 Change the Light Intensity and Fan Speed 10 After a few data points are collected click the Historical Data Viewer button This will use the code generated by Panel Wizard to open the Historical Data Viewer in MAX View Historical Data 11 View the Historical Data in MAX Citadel 5 Universe Historical Data Viewer File View Tools Help Configuration view Data 2 Refresh 7 Options Bide Help My Syst p ad Data Universe Back cea y 4 PE coma ot 5 2 on GB __Documents_and_Settings_rojackso_ Citadel p New Trace View Ca robi B IVI Drivers za B LabVIEW 5 2 fan Universe Heat Lamp 7 A Thermocouple Basics EE Network gt lt R robj C__Documents_and_Settings_rojackso_Deskt What do you
109. e the HMI Wizard you must not fully understand DataSocket However prior knowledge of DataSocket and Front Panel DataSocket helps increase your understanding of the HMI Wizard Refer to the LabVIEW Advanced course or the LabVIEW User Manual for more information about DataSocket LabVIEW DSC Module Course Manual 3 12 ni com ________ Elements of an Effective User Interface Example of e Usage of the appropriate Ineffective Design type of indicator control mm e Clear intuitive label Mx names Example of Appropriate usage of Effective Design graphics to illustrate m process or system R Elements of an Effective User Interface When designing a DSC Module Client one of the most important yet overlooked considerations is ensuring that your application uses an effective user interface One important choice is choosing the appropriate kind of control or indicator When monitoring a level of volume for instance a tank indicator is usually a better choice than a regular numeric indicator Similarly for an input that may only take a certain range of values consider using a slider rather than a numeric control so that the range is clearly marked When you decide on the proper component make sure that you give the component a descriptive name Many users initially leave component names unchanged but this makes the function and correct usage difficult to discern DSC also provides Image Navigator accessible from the DS
110. eadband 1 0 1 0 0 5 Volts Actual Values 10 10 2 9 7 9 6 9 3 Recorded Values 10 9 3 What is a Deadband A deadband is a region where values can change but it does not update the output value In the example in the slide the input range is 0 50 V and the deadband value is 1 0 Therefore the value does not update until value changes by at least 1 0 of the total input range 0 5 V in this example In this case the initial value is 10 0 V so the value must rise above 10 5 V or fall below 9 5 V before the value will update The values between 9 5 and 10 5 are a band of numbers that are essentially dead Keep in mind that the deadband moves with each new updated point For example in this slide after the 9 3 is recorded the new deadband is between 9 8 and 8 8 Why Use Deadbanding Deadbanding prevents unnecessary processing of tag values When you use deadbanding the value updates only when the value changes more than the deadband This prevents unnecessary network traffic and datalogging due to noise in the signal value National Instruments Corporation 6 3 LabVIEW DSC Module Course Manual Deadbands in the DSC Module There are four places in the DSC Module where Deadbanding is used O Group Deadband of range Update Deadband of range Alarm Deadband of range Log Deadband of range N NATIONAL INSTRUMENTS There are four separate deadband set
111. eading Tags 32 apea Tag Read VI A 3 Inputs e Tag to read timeout Outputs e Value timestamp status error M me mo Ge shutdown Example alue status FRFP Thermocouple Tag F pisz Read from thermocouple tag i CJE e 30 EJ lue timestamy Wait no more than 30 seconds z me eue pestane Stop when engine shuts down ni com NATIONAL F STRUMENTS Programmatically Reading Tags To read a tag value you must specify which tag to use An optional timeout parameter specifies the amount of time to wait for a new tag value This timeout parameter allows you to easily create event driven code If you put a 1 in the timeout then the Read Tag VI does not return until the tag values change more than the Engine deadband or until the Engine is shut down If you do not wire the timeout or wire a 0 in the timeout then the VI returns the current tag value The outputs of the Read VIs are the tag value the timestamp of the value an integer representing the status of the tag and a Boolean that indicates whether an error occurred The shutdown output indicates that the Engine is shutting down In this case the Read Tag VI no longer waits for the tag to be updated and immediately returns with shutdown TRUE It is advisable to use the shutdown output to halt your loops Simple Tag Read Example This slide reads the FP Thermocouple Tag and updates the display either when the tag value changes or ev
112. eed slider 6 Right click the Historical Data Viewer button and select Security from the shortcut menu 7 Select the User or Group Everyone and select Disabled View Only from the Access pull down menu 8 Click the Add button to add a new user group Change the access rights to Full Access and then double click the Administrators group and click the OK button Click the OK button to accept these security settings 9 Repeat steps 5 through 7 for the Historical Trend button 10 Save the VI as Temp Chamber with Security VI in the C Exercises LabVIEW DSC directory 11 Try logging in as Guy using Tools User Name from any VI Can you change the Light Intensity or Fan Speed sliders 12 Try logging in as Rick using Tools User Name from any VI Can you launch the Historical Data Viewer or the Historical Trend End of Exercise 8 2 National Instruments Corporation 8 27 LabVIEW DSC Module Course Manual Optional Exercise 8 3 Programmatically Controlling User Access Objective To modify an existing VI to add the ability to programmatically login 1 Open the Temp Chamber VI located in the C Exercises LabVIEW DSc directory 2 Adda button on the front panel and change the Boolean text to Log in if Temp Chamber Ex 3 2 i Front Panel File Edit Operate Tools Browse Window Help oo 15 xi Real Time Data Alarms Historical Data Temperature in Chamber a a 2 a 5 lt LabVIEW DSC Module Course Manu
113. ell as giving the tags a name that matches the item name read from the server You also can rename tags National Instruments Corporation 2 9 LabVIEW DSC Module Course Manual Tag Properties Tags are identified by a descriptive name Five Important Tag Attributes Type Analog Discrete Bit Array String Access Input Output 1 0 Memory Value The data you want Status Is the data good Timestamp When was this data acquired ni com NATIONAL F STRUMENTS Tag Properties Because tags are the way to receive data that is both simplified and enhanced it makes sense that a variety of properties exist for your data These allow you to better understand and evaluate your data The most obvious and important property of a tag is its name Whether you have one source of data or several thousand a descriptive name is very important Frequently your hardware refers to available data as a number an I O point or another vague name However a tag does not need to retain that same name Therefore a tag called Temperature can read from a data source with a less descriptive name In addition the tag contains five important properties Much like a variable each tag has a specific data type You can access each tag in different ways Some tags can be both read and written to but others you can only read or write to not both Each tag also has the desired data on it Depending on that va
114. en click Channel 0 Click the Write button at the top of the window On the pop up menu enter a value of 20 and click the Update button The light should turn on inside your temperature chamber Enter 100 and click the Update button The light should get brighter After you verify that the light responds enter a value of 0 and click the Update button to turn the light off If your light does not behave correctly notify your instructor 12 Click Channel 1 Click the Write button at the top of the window On the pop up menu enter a value of 20 and click the Update button The fan should turn on inside your temperature chamber Enter 100 and click the Update button The fan should start spinning faster Changes in fan speed can be difficult to see You can listen to the fan to verify the behavior After you verify that the fan responds enter a value of 0 and click the Update button to stop the fan If your fan does not behave correctly notify your instructor 13 Select Tools FieldPoint Save As from the MAX menu Name the file Fieldpoint Temperature Chamber iak and save it FieldPoint o New NI DAQmx Configuration gt Ga Open NI VISA gt EH save RT PXI Disk Utilities HET NI 488 2 gt National Instruments Product Updates Download item names on Save Install legacy driver support Traditional NI DAQ Configuration gt Save As Save in ck E Jed DSC QLabvIEw Data a My Music A My Pictures Fil
115. enerate Tags Approximate time to complete 20 min Page 2 20 Discover how you can add and manipulate tags in your VIs OBJECTIVE LabVIEW DSC Module Course Manual 2 14 ni com Tag Attributes General e Tag name Group Lets you categorize tags good for dealing with large numbers of tags e Description Explains function Tag Description _ motor is generating E of tag e Security User based read write access General Name Group Description Tag Name MotorRPMSensor Tag Group lt ALL gt 2 R 3 amp ni com NATIONAL F STRUMENTS Tag Attributes General To access the General Attributes of a tag either create a new tag or double click a tag in the TCE A tag configuration dialog box appears with five tabs The General tab appears up front by default Use the General tab to create or modify the Tag Name Tag Group or Tag Description Make the Tag Name a name that operators can easily relate to For example use a name such as Tank Level instead of sensor1 Then when action needs to take place an operator can easily separate that individual tag from a list of possibly hundreds You also can group a set of tags using the Tag Group selection but keep in mind that only one level of hierarchy is supported Use grouping to keep your tags organized or to apply certain operations to many tags simultaneously The Tag Description can
116. er New User Account When you first install the DSC Module the following lists several built in accounts and groups e Administrator always has full access can change security settings e Guest e Nobody default when there is not a user logged on always has level 0 access You cannot delete these accounts You can create as many accounts or groups as you need Using groups helps make managing security easier and avoids repetition There are four built in groups Administrator Guests Operators and System Operators National Instruments Corporation 8 3 LabVIEW DSC Module Course Manual Creating New Accounts National Instruments User Account Manage User Options Help Import Lookout 3 x Security File Import BridgeVIEW User Accounts New User ACOON Usemame aeinsten Full Name Albert Einstein Cancel Desciptin flabtuel Heb Confirm eT Password Security Levet 5 Minutes idle until logot 0 Password Never Expires Password Expires In Days Account Disabled New User Account Ctrl U New Local Group Ctrl G Hi Delete Del Properties Enter Exit Alt F4 User can then log into LabVIEW User can be added to a group by clicking here Creating New Accounts To create a new account in the User Account Manager complete the following steps 1 Select User New User Account 2 Enter the basic information ab
117. ere the DSC Module Fits in LabVIEW Examine this slide Concentrate on how data flows between elements The DSC Module integrates with LabVIEW and is a go between for LabVIEW and your hardware This enables an application to be indifferent to the actual choice of hardware As you can see the Tag Engine handles the majority of the work while Citadel stores and passes data back to LabVIEW when requested The Tag Engine handles requests to read or write to the hardware and obtains the results of those operations making them available to the program Thus you can read your hardware values in much the same way you would read a variable LabVIEW DSC Module Course Manual ni com gt gt gt High Speed Solutions e Use the DSC Module with high speed acquisitions Use one environment for DAQ FieldPoint and OPC Data Acquisition with DAQ VIs Data Acquisition with FieldPoint Vis FE pee m A MotorRPMSensor 7 palue Data Acquisition with DSC VIs IN JE RSTRUMENTS High Speed Solutions For applications that require high speed efficient data transfers DAQ and FieldPoint VIs provide a powerful solution With the DSC Module you can maintain your DAQ FieldPoint and DSC Module code within one environment Use the DSC Module to easily communicate with any hardware using OPC in the same application containing your high speed Fie
118. ery 30 seconds The While Loop stops when the Engine is shut down Because we use a non zero timeout this loop is both event based and polling The While Loops does nothing until either the tag value changes or our thirty second timeout has elapsed Remember that event driven programs use much less CPU because they do not have to perform any work when the values are not changing However if you have a finite timeout your VI does not wait forever for the value to change National Instruments Corporation 6 15 LabVIEW DSC Module Course Manual Programmatically Writing Tags Zum Tag Write VI Inputs Tag name value generate event write on value change Outputs e Value status error Example RFP Analog Output Tag Write to analog output tag fale 2 rate event F EA Write a value of 2 5 volts MEC a write value on change F Write value only when changed E 1000 A TRR JERSTRUMENTS Programmatically Writing Tags The Write Tag VI updates the value of an output tag It can be setup to write the value every time or only when the value to write changes The VI has a shutdown output just like the read so that the While Loop can be stopped when the Engine is shutting down Sample VI Using Tag Read and Write Vis This VI writes to the FP Analog Output Tag The loop runs once every second and is set
119. es click No Then save a copy in the latest Excel format To see what might be lost click Help Yes No Help LabVIEW DSC Module Course Manual 6 30 ni com 16 Select File Exit to close Excel 17 In the Tag Configuration Editor select File New then File Import Navigate to Modified_large txt in the C Exercises LabVIEW DSC directory and click the OK button to import the file 18 Double click one of the tags in the range 40500 41000 then click the Scaling tab Check that linear scaling occurs from 4 20 to 0 100 Click the OK button when you are finished 19 Double click one of the tags in the range 50 100 then click the Scaling tab to confirm that these lines are inverted Click the OK button when you are finished 20 Close the Tag Configuration Editor End of Exercise 6 2 National Instruments Corporation 6 31 LabVIEW DSC Module Course Manual Exercise 6 3 Reading and Writing to Tags in LabVIEW Objective To use LabVIEW Vis to read from and write to your tags Front Panel 1 Launch LabVIEW and open a blank VI 2 Select Tools DSC Module Configure Tags to open the Tag Configuration Editor 3 Make sure that the Temp Chamber scf file you created in Exercise 2 1 is loaded If it is not loaded select File Open in the Tag Configuration Editor navigate to the Temp Chamber scf file in the C Exercises LabVIEW DSC directory and click the OK button to open the file 4 Close the Tag Configuration Editor
120. esent the real world environment Select Tools DSC Module Image Navigator to open the image navigator Inside the Image Navigator you can select individual pictures and import those to the front panel of your VI You also can paste images from the Image Navigator onto Boolean controls to customize the look and feel of the application LabVIEW DSC Module Course Manual 3 8 ni com Optional Exercise 3 1 Creating an Effective User Interface Approximate time to complete 15 min Page 3 20 To use LabVIEW and the Image navigator to create an advanced application that simulates the real world application of the Temperature Chamber OBJECTIVE National Instruments Corporation 3 9 LabVIEW DSC Module Course Manual Exercise 3 2 Generating Code with HMI Wizard Approximate time to complete 15 min Page 3 25 To use the Tag Wizard to connect to FieldPoint Tags and then with the HMI wizard to generate code that acquires data OBJECTIVE LabVIEW DSC Module Course Manual 3 10 ni com Viewing Connections Control Connections Control Connection Information e Select Tools Control Connections e Shows all Front Panel DataSocket connections e Only available in LabVIEW DSC Viewing Connections In addition to creating owned labels that either have descriptive names or actually reflect the Tag that a DSC Modu
121. every thirty seconds whichever occurs first LabVIEW DSC Module Course Manual 6 18 ni com Polling Example e Checks all values at consistent intervals Advantage Allows proper calculations between multiple tags Disadvantage Increases network traffic Chamber Temperature v asi Rea jk Chamber Temperature 2 v i Heat Lamp Control E Fen gt gt a gt A i Chamber Temperature 3 FR JERSTRUMENrS Polling Example This VI reads a value from three different temperature sensor tags every 0 5 seconds 500 milliseconds and averages their values If the average value for the three sensors is less than 80 then a heat lamp is turned on If the average value read from the temperature sensors is greater than 80 then the heat lamp is turned off There is a Tag Write VI in the True case of the case structure that cannot be seen in the illustration in this slide The loop stops running if the Tag Engine stops running This example is similar to other examples in this lesson except the example is purely a polling driven example Nothing about the previous example is event driven The values are read from the tags every time the loop iterates regardless of whether they have changed In this slide the tags get read every 0 5 seconds 500 milliseconds due to the wait time in the loop In this example three measurements are being averaged if they were event driven tag reads the
122. gator Cool fan animation frame 1 File Edit View Options Help Copy as Picture wmf Only Paste AY gt Delete Son E Import ee Export Symbol Options Properties Computer Hardware Cammer Kewe d Inthe Control Editor right click the square LED and select Import Picture False from the shortcut menu to customize the false picture of the LED e From the Image Navigator select Cool fan animation frame 2 right click and select Copy from the shortcut menu f Inthe Control Editor right click the square LED and select Import Picture True from the shortcut menu to customize the true picture of the LED 5 Save the custom control as Spinning Fan ct1 inthe C Exercises LabVIEW DSC directory 6 Select File Apply Changes and then arrange the Tank Spinning Fan and Light Intensity Boolean controls on the front panel LabVIEW DSC Module Course Manual 3 22 ni com Block Diagram 1 Create the following block diagram Controls the brightness of the LED that simulates the Light Intensit Intensit Light Intensit L Reset the Stop Button to Default False 100000000 ab Control ight Intensity DBL DBI p 2 Place two While Loops located on the Functions Execution Controls palette on the block diagram 3 Inthe top While Loop create the code to adjust the brightness of the Light Intensity indicator a Right click the Light Intensity indicator and
123. h control values before using real world data LabVIEW DSC Module Course Manual 2 12 ni com E Organizing Tags Especially useful in situations with extremely large tag counts or with many pieces of hardware connected Tag Groups help keep tags logically grouped and can save time in applying some common features e Separate SCF files keep unneeded tags from being loaded and used ni com NATIONAL F STRUMENTS Organizing Tags As you continue to grow more familiar with DSC and develop VIs you will inevitably encounter a situation with many tags If you just kept all the tags for all of your VIs in a single file it would be very difficult to keep track the purpose for each tag Tag Groups and SCF files help combat this problem and assist in making logical sense of your information in addition to implementing some time saving features Tag Groups are set up in the TCE and allow you to place active tags in logical groups You can then control certain group attributes and fine tune the behavior of many tags simultaneously Placing tags in separate SCF files will help preserve system resources and only enable particular tags As you have more VIs that use the DSC Module the VIs use different tags and pairing a VI with an SCF file can be a very powerful organizational tool National Instruments Corporation 2 13 LabVIEW DSC Module Course Manual Exercise 2 1 Using the Tag Configuration Wizard to G
124. hat your changes take effect 12 To make sure that the Tag Engine will load this SCF file select Tools Options in the Tag Configuration Editor and make sure that the file is specified as the Default SCF Logging Test Data Runs This section describes a VI that executes the motor tests Open and run the Ex 5 1 Motor Response Test VI located in the c Solutions LabVIEW DSC Lesson 5 5 1 directory The example VI has a Start Test button that is used to start a test After the VI starts it runs a predefined setpoint waveform indicated by the red line on the trend The motor tries to follow the setpoint The motor response is measured through an RPM sensor and is indicated by the white line on the trend National Instruments Corporation 5 23 LabVIEW DSC Module Course Manual The complete test runs for about 10 seconds After the test completes you can start the next one Motor Response Test vi Front Panel 4 10 x File Edit Operate Tools Browse Window Help mm c E m 13pt Application Font EU Tar RICE t5 _4 Start Test Ezi pars MotorRPMSensor s MotorRPMSetPoint Figure 5 1e Motor Response Test VI Front Panel The core part of the VI is a Sequence Structure The Sequence Structure executes when the user clicks the Start Test button Frame 0 shown in Figure 5 1f generates a unique string with the following format Test HH24 MM SS for example Test 14 58 33 The string becomes a run
125. he timeout set to an integer value X integer value X 30 in this slide the tag read occurs every time the value changes more than the deadband or every X seconds whichever occurs first It is a combination of the previous two methods National Instruments Corporation 6 17 LabVIEW DSC Module Course Manual Tag Read and Write Example IFP Thermocouple Tag v IFP Analog Output Tag Y e Read the value of the thermocouple when it changes or every 30 seconds e Check if the value is above 80 F If Not Output a Value of 2 5 V to the FP Analog Output Tag URE JERSTRUMENTS Sample VI Using Tag Read and Write VIs This VI reads a value from the FP Thermocouple Tag when the value has changed or after 30 seconds whichever comes first If the value read from the thermocouple was less than 80 F then 2 5 V are output to the FP Analog Output Tag If the value read from the thermocouple is greater than 80 F then a value of 0 0 V is output to the FP Analog Output Tag There is a Tag Write VI in the True case of the case structure that you cannot see in the illustration above The loop stops running if the Tag Engine stops running While simple the example in the slide above shows you how you can control the temperature of an environment assuming that the FP Analog Output Tag powered a heater This VI is partially event based and partially time based so that it takes CPU time either when the temperature changes or
126. his method For example Database_1 is the backed up database and Database_2 has data missing that you would like to replace from the backup If the Archive Traces VI is used as above only data that is different or missing in Database_2 is replaced by data from Database_1 Thus this fills up any holes that may exist To restore the entire database you would create a new database and archive the backed up database back to the new database created to copy all the data over National Instruments Corporation 5 17 LabVIEW DSC Module Course Manual Deleting Data e Delete individual tag values data sets or entire databases e Use LabVIEW DSC VIs or use MAX Citadel 5 Universe Measurement amp Automation Explorer File Edit View Tools Hel Delete Traces i view Data 2 Refresh gt show Help 2 Data Neighborhood tag namesjtrace patterns all database name Gi Devices and Interfaces Universe 5 My Computer ansaha 5 0 error in no error BG Historical Data GA ansaha Archive options E Citadel 5 Universe a DataSets Compact lt b New Trace View EF Network Rete A Scales Software GA MI Drivers O Remote Systems Detaching the database will disassociate the database from Citadel while keeping the data intact You can use Create Attach Database to reassociate the database Databases JTE Remove the selected database from the datab
127. ier scaling models Fase ptm e Critical to set accurate units Zero Scale oo ooo ComcstoRenee PT Used by the engine to set ranges e Non analog tags Discrete tags can only be inverted String tags do not have scaling ni com NATIONAL F STRUMENTS Tag Attributes Scaling The scaling converts the raw data read from the server into engineering units suitable for operators Engineering units are standard measurement units such as C F and liters This is how the actual physical quantity is represented An example of scaling is to take a 4 20 mA current measurement from a pressure sensor and scale it into PSI The following lists types of analog scaling Linear y m raw measurement b b engineering min m engineering max engineering min raw max raw min e Square root b m sqrt raw measurement b engineering min m engineering max engineering min sqrt raw max raw min The raw scale is the range of values read from the server If the server already performs scaling then additional scaling might not be necessary The engineering scale determines the range of values used by the Tag Engine and your application When no engineering scales are defined the DSC module does not perform scaling Discrete tags support only inverting the value Bit array tags allow you to select which bits are inverted and which bits are always 0 String tags have no scaling available
128. ir performance Acting as an interface between your VI and your hardware the DSC Module allows you to design your application without concerning yourself with the hardware implementation of acquiring your real world data The DSC Module also is made to extend the development options available to you when designing your VIs It gives you access to many features that are useful even in environments where no hardware is involved LabVIEW DSC Module Course Manual 1 2 ni com o LabVIEW as a HMI SCADA System cy _S Security Alarms A etworking w lt DSC Module Trends 100 80 Data Logging sh GB SOMO Zs ni com The LabVIEW DSC Module as a HMI SCADA Interface The DSC Module provides a variety of powerful tools for creating a Human Machine Interface HMI Supervisory Control and Data Acquisition SCADA system These features are robust and powerful enough to customize to your exact specifications DSC Module features include the following e Data Logging Write your data to a database automatically with DSC Trends Examine logged data from a few minutes to several years e Alarms and Events Analyze data to watch for conditions of interest e Networking Share data across a network Security Add restrictions on who can modify or use applications National Instruments Corporation 1 3 LabVI
129. irst timestamp stops use as wildcard F error out starts historical trace Get Trace Statistics vi Get Trace List vi Formatting information trace information database URL tag names output file path database name tag names trace patterns all error in no error options Delete Traces vi NATIONAL F STRUMENTS Using the Historical Data VIs Read Trace VI Reads the historical data for a given tag using the specified time interval up to the max points in trace specified If database URL is not wired the VI will read the tag name trace from the database specified in the current SCF file If the tag name trace does not exist in that database the VI returns an error If time interval is not wired all historical data for the tag is returned up to max points in trace specified If max points in trace is left unwired 1 all points between the start and stop time stamps set in time interval are returned Decimate Trace VI Use this VI to decimate resample historical trace data from the first timestamp to the last timestamp The decimated trace output is a 1D array of the value at each time interval from the first timestamp to the last timestamp Get Trace Statistics VI Computes statistical data for a historical trace Statistics include minimum value maximum value average and standard deviations Get Trace List VI Use this VI to retrieve a list of trac
130. it is read On Change requires the value to be different than the last value in order for it to be recorded The deadband is important when trying to create event based code Note If you have the wrong scale defined in the Scaling tab it affects the deadband If the data is changing but the LabVIEW DSC module tag value is constant check the scale and adjust the deadband if necessary Logging Data and Events Y ou must specify which tags to log to the database A checkbox for logging data is on this dialog box When this checkbox is checked and the Tag Engine is set to log data the tag values will be logged to the database By default the Tag Engine starts logging data on startup You can stop the Engine from logging any data in the Engine Manager window If the Log Data checkbox is empty this tag is not logged to the database although other tags may be logged The Log Deadband field specifies the smallest percentage change from the previous value that is treated as a new value If you have a low deadband you log more data points which uses more space on your hard drive Therefore choose your deadband carefully National Instruments Corporation 6 5 LabVIEW DSC Module Course Manual _ Tag Attributes Scaling E Converts raw data into engineering General Connection Operations Scaling Alams units Engine Uk BETTZETEB For example voltage to temperature e Allows for linear and square root AE
131. itor Make sure that the Temp Chamber scf file that you created in Exercise 2 1 is loaded If it is not select File Open and open the Temp Chamber scf file located in the C Exercises LabVIEW DSC directory In the Tag Configuration Editor highlight the Temperature Chamber tag and select Edit Copy to create a copy of the tag In the menu that displays enter Deadband 0 for the Tag Name Click the Operations tab and enter a value of 0 00 as the Update Deadband of Range Click the OK button to accept the changes Repeat steps 4 and 5 using the following settings Tag Name Update Deadband of Range Tag Name Update Deadband of Range Deadband 1 1 00 Deadband 5 5 00 Select File Save As and save the file as Temp Chamber61 scf in the C Exercises LabVIEW DSC directory Close the Tag Configuration Editor National Instruments Corporation 6 25 LabVIEW DSC Module Course Manual 9 In LabVIEW build the following front panel E gt Untitled 5 Front Panel gt OLN 10 On the front panel idle the mouse over the Numeric control and right click it Select HMI Wizard from the shortcut menu In the dialog box that displays select Deadband 0 from the Tag pull down menu and click the OK button gt HMI Wizard for Analog Indicator raj LabVIEW DSC Module Course Manual 6 26 ni com 11 Repeat step 10 for the three remaining front panel controls and select
132. ive the data and make it transparently available to users In some applications the VI that is the client may then return this data back to the server Whether you design a VI intended to function distributed across several computers or are just developing an application for a quick one time use you must use these design patterns for programming with the DSC Module Do not associate the DSC Module concept of clients and servers with those used in networking In DSC a Client and Server can and often do run on the same machine however you also can distribute clients and servers over a network LabVIEW DSC Module Course Manual 3 2 ni com A Good LabVIEW DSC Server The Tag Engine is the main part of your server Servers are stand alone and do not require a client process to run e Perform analysis and control on the server e Servers deliver data to interested clients through the Tag Engine gt Engine Manager le ESTERS BE Hsecurty scf Demo g v Log Data Log Events v Error Dialog Show Events JERSTRUMENTS A Good LabVIEW DSC Server The Tag Engine is the main component of any server in the DSC Module In some cases when you do not need analysis and control the Tag Engine is all that is necessary for a LabVIEW DSC Server The main component of any DSC Module server application is the Tag Engine By adding a server VI to a DSC Module application you ca
133. j LabVIEW Cooling Fan Cooling Fa 0 12 30 2003 9 23 37 W national pswii 19 robjilabvIEw Chamber Te Chamber 85 6357955933 _ 12 30 2003 9 59 56 I NI DWL9GLS7 Y ni e2rpsy rel 9 pbrdell W remzia i 4 robj R Labview 1 9 Cham 1 9 Coolir 1 9 Heat T Serve 1 9 Setpo W supertest1 Y Swede nobody 7 Now you can monitor the value of Tags on the server machine Synchronizing System Clocks 8 Confirm that you are the Administrator for LabVIEW DSC a Select Tools User Name to open the User Login dialog box gt User Login Username Administrator Accounts Administrator Password b Enter Administrator for Username and select Administrator from the Accounts pull down menu Leave the Password textbox blank c Select User and then Exit to leave the Account Manager LabVIEW DSC Module Course Manual 7 42 ni com 9 Select Tools DSC Module Options to open the Options dialog box 10 Select the Advanced tab gt Options Environment Startup Advanced _ Preload tag editor when LabVIEW starts C Close Tag Monitor when LabVIEW exits Close Image Navigator when LabVIEW exits System Log C Program Files N ational 4 Instruments LabVIEW 7 0 Use default location Registered Computers Time Synchronization Security Preferences 11 Click the Time Synchronization button to open the Time Sy
134. k and drag the Numeric Constant to create a copy of it Place a Divide function located on the Functions Arithmetic and Numeric Express Numeric palette on the block diagram Place a Greater Function located on the Functions Arithmetic and Compare Comparison palette on the block diagram Right click the output of the PID VI and select Create Indicator from the shortcut menu 3 Place a Case structure located on the Functions Execution Control palette on the block diagram a Create a DSC Write tag for Heat Lamp Control Tag and Cooling Fan Control Tag 1 Place two Write Tag VIs located on the Functions All Functions DSC Module VIs Tags palette on the block diagram 2 Right click the Tag Name input of each Write Tag VI and select Create Constant from the shortcut menu to create a constant for each tag 3 Select Heat Lamp Control for the first tag and Cooling Fan Control for the second tag Place a Merge Signals Express VI located on the Function Signal Manipulation palette on the block diagram In the True case of the Case structure connect the PID Output from the PID VI to the value for the Tag Write VI that goes to the Heat Lamp Control Tag Create a constant with a value of 0 and wire it to the value for the Cooling Fan Control Tag In the False case of the Case structure connect a constant with a value of 0 to the Write Tag VI for the Heat Lamp Control Use an Absolute Value function located on the Functions A
135. k traffic while still accomplishing the same task as the polling example LabVIEW DSC Module Course Manual 6 20 ni com Exercise 6 3 Reading and Writing to Tags in LabVIEW Approximate time to complete 15 min Page 6 32 To use LabVIEW VIs to read from and write to your tags OBJECTIVE National Instruments Corporation 6 21 LabVIEW DSC Module Course Manual l Changing Tag Attributes Programmatically Chamber Temperature ge e 7 EEC Nadi VIs Tag Attributes oT ag Attributes gt J Get Ser EM EH ka Get Ser EM EH ka TAG Des ing gil 3 DB ra 28 DB 608 GetAlrm Get An Get BtA Get Bad Enabled AlrmLim kam AlrmSet Status e Change any attribute of an existing tag while the program is running e Retrieve the current configuration details of any tag programmatically ni com meg pe OBL alarms Enabled vH et lt none gt j On Scan Update Deadband Log Data Log Data Deadband Log Print Events Coerce Alarm Deadband Auto Ack Bad Status Enabled Bad Status Priority HI HI Enabled HI HI Limit HI HI Priority HI Enabled HI Limit HI Priority LO Enabled LO Limit LO Priority LO LO Enabled LO LO Limit LO LO Priority Discrete Enabled Alarm on OFF NATIONAL INSTRUMENTS Changing Tag Attributes Programmatically When using the DSC Module one of the most powerful features is the ability to
136. keep tags separate and how to manipulate the two National Instruments Corporation 2 19 LabVIEW DSC Module Course Manual Exercise 2 1 Using the Tag Configuration Wizard to Generate Tags Objective Discover how you can add and manipulate tags in your VIs Note This exercise assumes that Measurement Automation Explorer MAX has already detected the FieldPoint unit 1 Open MAX Click the symbol to expand the Remote Systems group Click the symbol to expand the group corresponding to your IP address Click the symbol to expand the FP 2000 0 Bank group 2 Click the FP TC 120 module to select it 3 Click the Channel Configuration tab at the bottom of the right side of the window 4 Make sure there is a checkmark in the Channel 0 checkbox Select 454 to 3218 Fahrenheit from the Range pull down menu Leave Percent Deadband set to 0 then select J from the Value pull down menu Click the Apply button at the bottom of the window FP TC 120 1 Measurement ft Automation Explorer File Edit View Tools Help Configuration iNew copen glsave Coto Refresh gt Show Help gt FieldPoint Items untitled a a FP 10_0_34_16 Channels Data Configuration Range 0 FP 2000 0 gt Aiea Type 1 Analog input 454 to 3218 Fahrerhet x FP PWM 520 2 Channel 0 FP 10_0_34_107 Channel 1 FP 2010 GO Channel 2 FP AI 110 1 x Channel 3 ig FP A0 200 2 m mete FP D0 401 3
137. l Time Data Alarms Historical Data Temperature in Chamber Chamber Temperature 140 130 Temperature F o ez 1 1 I wo 1 c o O m Time Historical Data Viewer Historical Trend a Place an OK button located on the Controls Buttons amp Switches palette on the front panel Change the text of the button to Historical Trend and change the owned label to Historical Trend b Right click the Historical Trend button select Visible Items Label from the shortcut menu and deselect Label National Instruments Corporation 3 33 LabVIEW DSC Module Course Manual 3 Use the Panel Wizard to generate code a Right click the Historical Trend button and select Panel Wizard from the shortcut menu to open the Panel Wizard gt Panel Wizard With this control Open a Panel Panel Button Polling Login prompt O Historical Data Viewer Tag Monitor Ovl Path to Yl c iExercises LabYIEW DSC Historical Trend Simulation vi C Relative path b Select the Panel tab and select VI Click the Browse button and navigate to the Historical Trend Simulation VI located in the C Exercises LabVIEW DSC directory d Inthe Polling tab select Always Panel Wizard With this control Open a Panel v Panel Button Polling Pall this control Until engine shutdown Always LabVIEW DSC Mo
138. l Wizard Programmatically open Vis ni com NATIONAL F STRUMENTS Lesson Summary You now have the knowledge necessary to maximize the effectiveness of many applications You have gained an understanding of when you need to design a Server and when you can allow the Tag Engine alone act as a server You also can use various wizards to make powerful applications The HMI Wizard can connect with your data and the Panel Wizard can organize and streamline the analysis of that data National Instruments Corporation 3 19 LabVIEW DSC Module Course Manual Optional Exercise 3 1 Creating an Effective User Interface Objective To learn how to use LabVIEW to create custom controls and indicators to enhance the end user experience Complete the following steps to build a VI that programmatically varies the light intensity of a front panel Boolean and graphically simulates fan speed Front Panel 1 Create the following front panel gt Temp Chamber Template vi Front Panel File Edit Operate Tools Browse Window Help Light Intensity Fan Speed s 100 80 60 40 a Place two raised box decorations located on the Controls All Controls Decorations palette on the front panel and resize appropriately b Place a pointer slider control located on the Controls Numeric Controls palette on each raised box decoration and label one Light Intensity andone Fan Speed c Place a tab control located on the
139. l be backup Shared day1 This is incorrect because it does not specify the location of the remote database on the hard drive Use the following computer name and the directory path backup c Documents and Settings user Desktop Shared day1 The backup database must already exist in the remote computer to be able to backup to it You can use MAX to navigate to the shared folder on the remote computer on the network and create the database before archiving to it LabVIEW DSC Module Course Manual 5 16 ni com EE Merging and Restoring Databases Same method as archiving databases Use archiving method described previously for MAX e Use Archive Traces VI in the DSC Module source database URL LDatabase_1 destination database URL LDatabase_2 Archive Traces vi TRUE if source database is to be deleted after the merge restore archive task has completed JF STRUMENTS Merging and Restoring Databases In the DSC Module use the same tools for merging databases as used for archiving databases In the LabVIEW code in this slide Database_1 and Database_2 are merged into Database_2 Database_1 is deleted after merging the two databases together Deleting the first database is an option In MAX this same method should be used to merge two databases Simply archiving one database into another existing one merges the databases together You can restore databases using t
140. l for the Setpoint a Place a vertical pointer slide located on the Controls Numeric Controls palette on the front panel b Name the slide Setpoint c Resize the Setpoint control and change the range from 60 to 200 Block Diagram 1 Open the block diagram and notice the code generated to read the Setpoint tag 2 Modify the block diagram as shown in the following figure Chamber Temperature aveform Chart National Instruments Corporation 7 29 LabVIEW DSC Module Course Manual i Place a While Loop located on the Functions Execution Control palette on the block diagram Place a DSC Read Tag VI located on the Functions All Functions DSC Module VIs Tags palette on the block diagram Right click the Tag Name input and select Create Constant from shortcut menu to create a tag constant Click the Tag Constant and select Chamber Temperature Tag Place a PID VI located on the Functions All Functions Control PID palette on the block diagram Right click the VI and select Create Control from the shortcut menu to create controls for the PID Gains and Output Range inputs Place a Wait Until Next ms Multiple function located on the Functions All Functions Time and Dialog palette on the block diagram Right click the input to Wait until Next ms Multiple and select Create Constant from the shortcut menu Change the value to 1000 to set a wait of 1 000 ms Press and hold down the lt Ctrl gt key then clic
141. l modules can store and run embedded LabVIEW Real Time programs This allows intelligent NI FieldPoint systems to communicate with other network nodes to publish and share data or act as a reliable stand alone node LabVIEW DSC Module Course Manual 1 16 ni com FieldPoint Architecture u Terminal Bases e mm INSTRUMENTS FieldPoint features a modularized architecture consisting of the following components network modules connector blocks in CompactFieldPoint terminal bases and I O modules Network modules provide connectivity between the FieldPoint system and your computer or network The terminal bases and connector blocks provide field wiring connections for your signals power to the I O modules and the FieldPoint backplane bus for communications You can hotswap an I O module with an identical I O module and acquire signals without having to reconfigure the module You can hotswap FieldPoint I O modules but not terminal bases Therefore do not try to hotswap the terminal bases The I O modules are available in two standard types eight and 16 channel modules and dual channel modules for regular FieldPoint I O modules provide isolated analog and discrete inputs and outputs for a wide variety of signal types The I O modules are installed on terminal bases which allow you to plug and unplug your modules without disconnecting your field wiring National Instruments Corporation 1 17 LabVIEW DSC Mod
142. l variable b Place a Subtract function located on the Functions Arithmetic amp Comparison Numeric palette on the block diagram c Place an Equal to 0 function located on the Functions Arithmetic amp Comparison Comparison palette on the block diagram d Place a Wait function located on the Functions All Functions Time amp Dialog palette on the block diagram e Place a Select function located on the Functions Arithmetic amp Comparison Comparison palette on the block diagram f Right click the While Loop and select Add Shift Register from the shortcut menu g Right click the Stop button in the top While Loop and select Create Local Variable from the shortcut menu Delete the Stop button from the bottom While Loop and replace it with the Stop local variable This allows one Stop button to control both While Loops 6 Select the Stop local variable then press and hold down the lt Ctrl gt key and drag the Stop local variable to create a copy of it 7 Place a Sequence Structure and wire a Boolean constant to the Stop local variable a Place a Sequence Structure located on the Functions Execution Control palette on the block diagram b Place a false Boolean constant located on the Functions Arithmetic amp Comparison Express Boolean palette on the block diagram and wire it to the Stop local variable 8 Complete the wiring and save the VI as Temp Chamber Ex 3 1 vi inthe C Exercises LabVIEW DSC directory
143. larms occur they will be displayed in the control Right click any particular alarm to acknowledge it You also can set filter options by right clicking the Alarm amp Event Display control while it is running You can connect this control to alarms and events on your local computer or on other computers on the network Right click the control while the VI is running and choose Select Processes Go to Universe Network and navigate to the process on the network computer that you would like to monitor The Alarm amp Event Display is the recommended method of viewing alarms and events since it is more powerful It can be used to view and acknowledge alarms and events on local and remote computers National Instruments Corporation 4 17 LabVIEW DSC Module Course Manual Exercise 4 2 Using Alarms Approximate time to complete 20 min Page 4 30 Configuring alarms and viewing them in LabVIEW OBJECTIVE LabVIEW DSC Module Course Manual 4 18 ni com EE Programmatic Access to Data and Alarms Why Allows you to define your VIs behavior based on current data values and alarm states When When you need to view data or alarms in ways beyond the standard methods or you need enhanced functionality based upon that data e How Vs provided with DSC that you use in your applications ni com ni com ONA rs Programmatic Access to Data and Alarms To maximize the potential power of using DSC in y
144. ldPoint and DAQ programming National Instruments Corporation 1 7 LabVIEW DSC Module Course Manual The DSC Module Advantage Same set of VIs control all hardware in same manner Easy to use easy to understand e Changes in hardware do Data Acquisition With DSC VIs not affect your VI The DSC Advantage Use the DSC Module VIs to interface with all of your hardware through OPC using the same DSC Module VIs A single set of VIs simplifies programming regardless of the type of hardware you are using LabVIEW DSC Module Course Manual 1 8 ni com Exercise 1 1 Exploring the DSC Module Documentation and Help Approximate time to complete 10 min Page 1 22 Become familiar with the documentation available for the LabVIEW DSC module and locate the example programs that ship with LabVIEW DSC OBJECTIVE National Instruments Corporation 1 9 LabVIEW DSC Module Course Manual How We Apply the DSC Module Advantage e Tags Represent I O points on your hardware e Hides details from your VI the VI uses only the name and type e Also can be used as global variables or to share information over a network ni com NATIONAL JF STRUMENTS How We Apply the DSC Module Advantage Tags are the key to using the DSC Module effectively Tags assign a name to an input or output point on your hardware allowing you to access those points by simply using the tag names in your
145. le control is connected to the Control Connections tool allows users to monitor connections The Control Connections tool allows users to view the front panel DataSocket connections for all loaded VIs The information displayed is the URL that the controls are linked with their current status and their DataSocket Mode You can modify the view fields displayed and save the results to a text file for debugging or documentation National Instruments Corporation 3 11 LabVIEW DSC Module Course Manual m Understanding Front Panel DataSocket Direct connection from front panel to source of data HMI Wizard functionality is based on technology of Front Panel DataSocket e Designed to simplify and streamline the process of accessing remote data Disconnected Light Intensity Connected Light Intensity 100 10 ni com NATIONAL F STRUMENTS Understanding Front Panel DataSocket In LabVIEW traditional usage of a DataSocket requires additional programming However for programs that require simple DataSocket connectivity using the Front Panel DataSocket can reduce development time The front panel DataSocket allows a VI to make direct connections to resources elsewhere on the computer or across a network A small square LED which turns from grey to green to show when it is connected signifies the front panel DataSocket The HMI Wizard derives its functionality from usage of a Front Panel DataSocket To us
146. lette on the front panel 2 Right click the Historical Trend indicator and select HMI Wizard from the shortcut menu In the wizard select the Chamber Temperature tag from the drop down list under Tag List and click the Add button Add the light and fan tags to the tag list if you also want them to be displayed 3 Set the Historical Trend to automatically update every 10 seconds 4 Set the Time Axis parameters to display relative time and display the last 30 minutes of data Click the OK button HMI Wizard for Historical Trend xl Data Source SCF File Database Name PDA amp Files DSC Course C_ Temp f Kontent Project Exercises Temp rr Chamber scF Database Computer Browse 4E ansaha Tag List Tag localhost Lab IEW Heat Lamp Control X Add Historical Data Traces a Delete localhost LabVIEW Chamber Temperature Wlocalhost LabVIEW Cooling Fan Control Wlocalhost LabVIEW Heat Lamp Control Automatically update ever 10 Seconds Time Axis Absolute 3 HH MM SS Relative Pisplaylast 00 30 00 of data OK Cancel 5 Return to the front panel and examine the LabVIEW code that has been generated in the block diagram LabVIEW DSC Module Course Manual 4 24 ni com 6 Modify the block diagram as shown in Figure 4 la Notice that you are not able to edit the block diagram because it is locked Right click the lock icon in the top right corner of the While Loop and select Release
147. ling from none to Invert The resulting spreadsheet should be similar to the following figure EA Microsoft Excel large txt i 15 x H File Edit View Insert Format Tools Data Window Help Type a question for help sw B X D WSRGADY ABA V 2 Z MQ FE7Z 2 0 AA1953 z fx None A 1 Tag Name Raw Full SRaw Zero Eng Full S Eng Zero SUnits Scaling Coerce 2 Modbus1 41000 20 100 Linear Off 4 Modbus1 40999 20 4 100 Linear Off Modbus1 40998 20 4 100 Linear Off Modbus1 40997 20 4 100 Linear Off Modbus1 40996 20 4 100 Linear Off Modbus1 52 N A N A N A N A Invert N A Modbus1 51 N A N A N A N A Invert N A Modbus1 50 N A N A N A N A Invert N A Modbus1 49 N A N A N A N A None JN A Modbus1 48 N A N A N A N A None N A 1955 Modbus1 47 N A N A N A N A None N A Modbus1 46 N A N A N A N A None N A Modbus1 45 N A N A N A N A None N A Modbus1 44 N A N A N A N A None N A Modbus1 43 N A N A N A N A None N A 5 NUM 15 Select File Save As and save the file as Modified _large txt in the C Exerices LabVIEW Dsc directory Select Yes when prompted with the following dialog box The LabVIEW DSC Module requires the text format for imported files Microsoft Excel x Modified_large txt may contain features that are not compatible with Text Tab delimited Do you want to keep the workbook in this Format J To keep this format which leaves out any incompatible features click Yes To preserve the Featur
148. ll Functions Numeric palette to send the absolute value of the PID VI output to the value for the Cooling Fan Control Tag Write Tag VI Create a local variable from the Light Intensity Control While Loop and replace the Stop Button in the PID control While Loop Connect the value from the Stop local variable to the Sequence Structure that reinitializes the Stop Boolean to false Finish wiring the block diagram LabVIEW DSC Module Course Manual 7 30 ni com 4 Onthe front panel set the default values for PID Control a Place the PID Gains control and the Output Range control on the PID Settings tab Trial and error will generate acceptable values for the Proportional Integral and Derivative values for the PID control Start with the following values and see if you can improve performance J o mrm los aooo 7 10 00 Run the VI 1 Save the VI as PID Server Ex 7 1 VI in the C Exercises LabVIEW DSC directory 2 Display the front panel and run the VI Change the PID gains settings on the PID Settings tab 3 Change the Setpoint and watch the system respond End of Exercise 7 1 National Instruments Corporation 7 31 LabVIEW DSC Module Course Manual Exercise 7 2 PID Control Client Objective To expand functionality of DSC server so that a Tag can monitor server status and also a client VI can access the Setpoint on the server and update the value Part A Modify PID Server VI Complete the following steps to modify
149. lly you can browse to it Finally some servers require an access path to be specified The access path can tell the server to use a particular type of communication to talk to the hardware that is Ethernet versus serial NI servers do not use access paths so there is no need to specify one for our exercises You can use the menu rings to display and select the registered servers devices and items Tags are associated with a real world I O point through the Connection tab Note Refer to Lesson 6 Maximizing Tag Effectiveness for information on advanced Tabs of the Tag Configuration menu LabVIEW DSC Module Course Manual 2 16 ni com What is the Tag Engine Manages Tags Handles and monitors tags efficiently e Runs as a separate logdata loves T Pint Events Eror Dialog C Show Events process Independent of LabVIEW LabVIEW Vis 52 Your Program a DSC IL Citadel larms A NI DAQ FieldPoint NI or Third Driver Driver Party Drivers HE ZEE a filapi Aird Part egs GREY Modules What is the Tag Engine The Tag Engine runs as a separate application independent of the LabVIEW application Both the device servers and the LabVIEW application communicate with the Tag Engine This insures an extra degree of reliability for your system as the Tag Engine can continue running even if your LabVIEW application experiences problem
150. lue several different status values can be generated to indicate the condition of your data Finally each data point has an associated timestamp indicating when a measurement was acquired LabVIEW DSC Module Course Manual 2 10 ni com The LabVIEW DSC module supports the following tag types e Analog double precision numeric floating point e Discrete Boolean value e Bit Array up to 32 discrete values e String ASCII string Tag Types Analog Represent continuous values within a range Numerical controls or indicators should connect to analog tags Discrete Represent two state values that is true false or on off or 0 1 Boolean controls and indicators can represent discrete tags Bit Array Multi bit values up to 32 discrete values represented by an array of Booleans String ASCII or binary character representations of values A tag not fitting the previous tag types could be processed as a string tag for example bar codes National Instruments Corporation 2 11 LabVIEW DSC Module Course Manual Tag Access There are four different ways to access a tag R i Input You may only read values from the tag O Ed 4 Output You may only write values to the tag nh i Input Output You may both read and write values to the tag Memory An Input Output tag that is not connected to any hardware device CAE ni com NATIONAL F STRUM
151. ments Corporation 3 5 LabVIEW DSC Module Course Manual How the HMI Wizard Works HMI Wizard connects you to your tags e Automatically generates code x N i Data Connection Alams e Reduces development time in DSC s par f o Fe 1 EJ Either matches Control label to pr tag configuration 10 00 Min 0 00 Units I Match scale to t Max Tag s name or allows user to add descriptive labels ni com NATIONAL F STRUMENTS How the HMI Wizard Works The HMI Wizard handles much of the client development for you and provides a code base from which you can begin the remaining development HMI functionality is not does not appear hidden from the user instead the HMI Wizard uses only DSC Module functions that the user has access to as well This makes the HMI Wizard an excellent tool not only for speeding development but also for understanding the DSC development process The code generated is a great starting point for more advanced applications and the HMI wizard reduces development time The HMI Wizard takes Owned labels and either renames them to match the tag you connect them with or allows the user to add descriptive Control labels Owned Labels independently In addition the HMI Wizard is built on top of the front panel DataSocket and includes a Boolean LED to indicate whether the component is actively connected to the Tag value Owned Label An owned label represents the name of a Fron
152. mventi ms tr A dd R dE AA A elas chativaaes 9 Lesson 1 Datalogging and Supervisory Control DSC Module Overview 4sssusssaa sans za aasa a 1 1 A Introduction to the DSC Module e ses see aaa aaa aaa aaa aaa aaa aaa aaa aaa aaa aaa aaa aaa aaa aacaaaca 1 2 B How the DSC Module Improves Your Applications se esseesss aaa aaa aaa aaa aaa aaa aaa a aan azanacaaa 1 4 C Rapid Development eee w w c iw BA ORO AN AE Ad ERO O A add 1 11 D Understanding the Data Transfer ProceSs seeus eau aaa aaa aaa aaa aaa aaa aaa aaa aaa aaa 1 15 E Setimg Up FieldPoint zac A A Az AEO OG AAA OK AAA 1 16 Exercise blast ROG ZAD dead A E dod KO OG A OE A dy chee et isos a 1 22 Lesson 2 Getting Started with the LabVIEW DSC Module sseeao aaa aaa aaa aaa aaa aaa aa aaaaawaaaca 2 1 A The Basic Steps of DSC Development e 2 se ss eos aa aa ana aaa 2 2 BzAddme Hardware wa wd ni A AO wada sos aiw dA WTA Pa 2 3 CG Tagstand Your Hardware stat dka i Al O a iii 2 7 D What Is the Tag Em gine s sdi wiwa Elda iTEC 2 17 EXOrCIS 2a ise doza RON EO W AA E E E 2 20 Lesson 3 Designing Your LabVIEW DSC Application seusseeao aaa aaa aaa aaa aaa aaa aaa aa aaa aaa waza aca 3 1 A Understanding the Client Server Relationship e ssesos eos aaa aaa aaa aaa aware aaa 3 2 B How Do I Use HMI Wizard to Speed Development e usssua oaza aaa aaa aaa aaa a
153. n 6 1 LabVIEW DSC Module Course Manual The Importance of Tag Management Managing your tags properly simplifies programming and managing your application Well Managed Tags a Simplifies Programming N Simplifies Editing a Faster Program Execution ni com NATIONAL F STRUMENTS The Importance of Tag Management When you create and work with only a few tags you can keep track of the tags that you are using However when you develop a full application in many cases you work with hundreds or even thousands of tags Creating and keeping track of that many tags is difficult and time consuming Using proper tag management techniques allows you to quickly find and use the tags that you are interested in and also allows you to create and edit tags very quickly This lesson focuses on how to create multiple tags quickly and easily set the default properties of those tags change specific attributes of individual tags and group tags for organizational purposes This lesson also shows how to use the Tag Monitor read and write to tags in LabVIEW and start the Tag Engine from your LabVIEW program LabVIEW DSC Module Course Manual 6 2 ni com What is a Deadband e Region where value changes DO NOT update value on the engine Reduces processor usage network traffi Deadband Example anne Ou Tame Input Range 0 50 Volts Ignores signal noise Initial Value 10 0 Volts D
154. n add advanced control or analysis to the DSC Module server The server passes data back and forth between client s connects to the hardware through OPC and performs control or analysis if necessary The server should operate stand alone and should not require that the client be connected to run properly Displaying data on the Front Panel of a server is unnecessary This is the job of the client and can be helpful to display some information for debugging National Instruments Corporation 3 3 LabVIEW DSC Module Course Manual What Makes a Good Client Temp Chamber Ex 3 1 vi e Clean clear design of relevant values and their a ae meanings Intuitive descriptions of what data means not necessarily where it comes from TR JERSTRUMENTS What Makes a Good Client Many of the principles for creating a good client include clean and clear design of the user interface for displaying relevant values Keep data clearly organized and available One of the most powerful ways to do this is to group data onto separate panels and use features of LabVIEW such as the tab control You also can organize data onto separate Front Panels The DSC Module provides a powerful wizard to automate this process for you Equally important is ensuring that your data includes intuitive descriptions of what the data means This can sometimes involve just a descriptive name such as Engine Temperature o
155. n be automated using LabVIEW VIs and ensures that the database is backed up compressed or archived regularly LabVIEW DSC Module Course Manual 5 10 ni com How Long to Keep Your Data Historical data lifespan parameter i for historical logging specifies how RE nA long the data is valid in a database z EE After specified period of time old data is overwritten with new data Ensures that database size does not get too big if data is logged continuously for long periods of time salo a ni com NATIONAL JF NSTRUMENTS How Long to Keep Your Data If the application being logged is rerun on a regular basis or if the database is backed up regularly then set the Historical data lifespan parameter in the Historical Logging Configuration to a reasonable value Also if only recently logged data is necessary instead of old data the data lifespan can be reduced For instance if data more than one day old is unnecessary and inconsequential and only new data is desired set the Historical data lifespan to be about one day so that every 24 hours the database is overwritten and no data over one day old is logged Restructuring the Historical data lifespan ensures that if you are logging data continuously for weeks the database is only as big as one of logged data day of instead of being as big as one week of data To set this parameter open the Tag Configuration Editor from LabVIEW b
156. n one of three ways e Use the HMI Wizard to connect to Historical Data e Place an NI HyperTrend on front panel to view data e Use MAX to view historical data ni com NATIONAL F STRUMENTS Viewing Historical Data There are three ways of viewing your Historical Data The first is by using the HMI Wizard to connect to your Historical Data This is good for situations where you would prefer to view a few tags data over a period of time in a simple fashion Another option is to use a NI HyperTrend This feature allows you to display several tags values over time and gives you additional tools that you can access while a VI is running This is slightly more complicated than using an HMI Wizard but provides much more functionality The NI HyperTrend is an ActiveX control and therefore cannot be used with Remote Panels Finally you can avoid using a VI entirely and view the Historical Data in MAX LabVIEW DSC Module Course Manual 4 8 ni com EE Using the HMI Wizard to View Historical Data e Right click a Waveform Chart on the front panel i HMI Wizard for Real Time Trend Tag List and select HMI Wizard w a a e Select the tags you want to be displayed and configure the other Ga anne options as desired O Percent of full scale Cancel NATIONAL F STRUMENTS Using the HMI Wizard to View Historical Data Using the HMI Wizard is very simple like other tasks involving the D
157. n the PID Server vi located in the Solutions folder on your computer This VI monitors and controls the temperature in the temperature chamber using FieldPoint modules The temperature inside the chamber is monitored with a thermocouple The light on the chamber has variable intensity to add heat to the chamber as needed while the speed of the fan can be used to cool off the chamber as needed Click the run arrow to start the VI Experiment with different values for the Setpoint control Click the PID Output tab and notice that the light intensity and the fan speed will change according to the value of the temperature setpoint Notice the graphics on the front panel also simulate the speed of the fan and the intensity of the light LabVIEW DSC Module Course Manual 1 20 ni com Lesson Summary What is the DSC Module Designed to be quick powerful flexible The DSC Module handles hardware and software separately Using Wizards HMI Wizard Tag Configuration Wizard Panel Wizard FieldPoint Introduction Lesson Summary This lesson introduced you to the DSC Module You designed a basic application and can start learning how to build more applications Because you used wizards to build VIs you can extend the VIs in the following lessons to build upon the code generated by the wizards You also have learned how to set up FieldPoint devices and know where you can find more information on that topic
158. n the average would only change when one of the tags changed by more than its deadband However you could average one new value with two stale values Those stale values could have changed just not by more than their deadbands This results in an average that could differ significantly from the actual average temperature If you poll the tags you avoid this problem because you read the current tag value on every iteration There are no stale values to worry about The drawback is that polling increases the amount of network traffic even when the tag values are not changing Use polling only when it is truly necessary National Instruments Corporation 6 19 LabVIEW DSC Module Course Manual Event Based Example IFP Thermocouple Tag r MFP Analog Output Tag timeout secs 0 TU u e Reads the value of the thermocouple only when the value changes e Drastically reduces the amount of processing and network traffic e Accomplishes the same task as a timeout based loop Recommended method for this type of operation Event Based Example The example in this slide is nearly identical to the Tag Read and Write example with one small change The timeout value has been changed from 30 to 1 This turns the example into a purely event based example This means that the loop iterates only when the thermocouple value changes more than the deadband If the deadband is selected appropriately this allows for a reduction of networ
159. n the front panel and right click it Select Panel Wizard and a menu appears that allows you to determine the behavior of the button and the way the button handles that behavior National Instruments Corporation 3 15 LabVIEW DSC Module Course Manual Panel Wizard Launches Historical Data Viewer S New Trace View Measurement amp Automation Explorer a View Data Set Run E Add Remove Q Archive hi Export to Text Y8 Export to DIAdem g 4 gt bl 11 5 2003 1 34 40 8 PM 11 6 2008 1 34 44 6 PM Central Standard T AWoBRE Progr S robj C__ Progr Trace MrobAC__Progr View Basics m B Remote Systems T 01 34 42 0 PM 01 34 44 0 PM EJ Trace Properties EE Display ni com Panel Wizard Launches Historical Data Viewer You also can use the Panel Wizard to launch the Historical Data Viewer that is available in MAX Refer to Lesson 4 Handling and Logging Your Data for more information about the historical data viewer LabVIEW DSC Module Course Manual 3 16 ni com hh Understanding Code Generated by the Panel Wizard e Code on block diagram comes locked just like zr HMI Wizard W eiejnatinakiineke To unlock right cicieliie lock symbol Avoid unlocking code generated by the Panel Wizard Engine Status TE JERSTRUMENTS Understanding Code Generated by the
160. nchronization Settings dialog box Time Synchronization Settings Time Server Search Order Up D OWN Add Remove Sleep Time seconds 60 National Instruments Corporation 7 43 LabVIEW DSC Module Course Manual 12 Click the Add button 13 Find the Server machine from the list of computers Hint Expand the tree for My Network Places Select Computer F carl Host chimp localhost cougar2 3 4 DelCastillo 3 dmcclelland FRAT WA 4 lkunitz 4 MSHASTEEN Y nate 4 national pswiij 5 4 NI DWL9OGLS RGZW 4 ni e2rpsy4relsw W pbrdell Y remzia W robj 4 supertesti Y Swede 14 Select the server computer and click the OK button Time Synchronization Settings Time Server Search Order Down Add Remove Sleep Time seconds 60 15 The server computer name will appear in the Time Server Search Order section 16 Click the OK button to close each open dialog box LabVIEW DSC Module Course Manual 7 44 ni com On the Server Computer 17 Onthe local C drive navigate to the folder where the SCF file is saved and right click it Name CZ Aspect Documents and Settings Example Programs rk Open Con Explore C3N Search am Sharing and Security OF Cor U Scan for viruses ji J Add to Zip q gi Add to Exercises zip 0 Send To d lt Cut Copy 18 Select Sharing and Security from the
161. nd alone and not require a client process Analysis and Control should be done on the Server VI e Servers should deliver data to interested clients through Tag Engine Tag Engine accepts connections from multiple clients JF STRUMENTS In Lesson 3 Designing Your LabVIEW DSC Application you learned the qualities of a good server for the DSC Module Remember that creating a server VI is adding additional advanced features to the basic services provided by the Tag Engine in Lookout The main component of a DSC Module server application is the Tag Engine By adding a server VI to a DSC Module application you can add advanced control or analysis to the DSC application The main role of a server is to pass data back and forth between clients and hardware The Server VI should be stand alone and perform analysis and control for the system Something often overlooked when designing a server is that there is often limited need to view the values of the data in the server VI This is more in line with the role ofa client VI The server VI can transparently provide data to several clients The clients are then used by the operators to view results and update set points on the server VI LabVIEW DSC Module Course Manual 7 4 ni com o What Features to Include in Your Server Provide necessary code for control algorithms e Analyze and generate a response or perform calculations e Inform clients when server is running Allow
162. nel of the Exercise 4 1 VI notice that the button s name and label are same as the VI that you specified earlier Move the text button to a corner of the tab page 6 Run the Exercise 4 1 VI and modify the Light Intensity and Fan Speed to obtain varying results for Temperature in Chamber After approximately one minute switch to the Historical Data tab page and click the text button 7 The Ex 4 1 Historical Trend VI opens and displays the historical data of the configured tags Change the Light Intensity and the Fan Speed in the Exercise 4 1 VI to see the temperature change accordingly in the Historical Trend indicator 8 Stop and close the Ex 4 1 Historical Trend VI Stop the Exercise 4 1 VI Part D View Historical Data using NI HyperTrend 1 Open the Exercise 4 1 VI if it is not already open Click the Historical Data tab on the front panel 2 Place an NI HyperTrend indicator located on the Controls Palette All Controls DSC Module Trends palette on the front panel Resize the plot to fit the tab page Move the text button to one corner of the tab page so it is still visible fone Historical Data sons TO u M r r JE NI HyperTrend I4 4 gt bl 11725 20037 32 13 PM Central Standard Time 3 1 1 07 31 30 PM 07 32 00 PM STAD 3 Right click the NI HyperTrend indicator and select NI HyperTrend Properties from the shortcut menu 4 Click Add in the Channels Traces section Make sure Citadel 5 is selected
163. ng Historical or Events Browse to the remote computer and type in an existing directory for the data to be logged to The remote computer must have Citadel and the NI Logos Services installed NI Logos is installed with Lookout and with the DSC Module Citadel 5 is installed with either the run time or development environment National Instruments Corporation 7 25 TONA rs LabVIEW DSC Module Course Manual Remote Citadel Retrieval Historical Vis accept network path Make Network Database Path vi Make Network Database Path vi Remote Citadel Retrieval You must add the network path to the Citadel directory to be able to read the remote data Use the Make Network Database Path VI to form the correct directory for historical data VIs LabVIEW DSC Module Course Manual 7 26 ni com Summary What changes do you need to make to your server None just share the database and SCF directories e How can you test network connections The ping command What changes do you need to make to a DSC Module client e New SCF file with network tags and edit wizard code for historical trends How can you ensure your client and server machines have the same time Use the time synchronization server National Instruments Corporation 7 27 LabVIEW DSC Module Course Manual Exercise 7 1 PID Control Server Objective To demonstrate the use of LabVIEW DSC as a server for control
164. ng Tags Allows you to use data from the tags in calculations Allows for feedback loop control Access tag data Process tag data Output data to tags e Can access and change tag attributes while the program is running INSTRUMENTS N NATIONAL Programmatically Accessing Tags As an advanced user of DSC you might want to programmatically access tags on the block diagram of your VI By programmatically accessing your tags you can accomplish many things in your program that you could not do with the HMI Wizard method of accessing data that you learned in Lesson 2 Getting Started with the LabVIEW DSC Module The two most common reasons for programmatically accessing tags are for feedback control and for manipulating tag attributes By accessing your tags from the block diagram of your VI you can use their current values in control loop calculations For example you could control a heater based on the temperature of a room or control the intensity of a light based on the ambient light level of the surroundings Another use of programmatic control is programmatically changing tag attributes This allows you to turn alarms on and off and change deadband values while your programming is running The next few pages will discuss the implementation of programmatic access in your VIs LabVIEW DSC Module Course Manual 6 14 ni com Programmatically R
165. ng Tags to a File You can export the SCF file to a tab delimited ASCII file using the export feature You can choose which fields are exported and the order in which they are exported You can use this feature as a documentation tool as well as making changes in a spreadsheet application and import the tags back into the TCE Importing Tags After you have edited your tags in a spreadsheet you can import them back into the TCE You can combine two SCF files by exporting the contents of both SCF files and combining their data in a spreadsheet If you have a large SCF file that you are working with keep a backup file because debugging errors in a large spreadsheet file can be difficult Note The import option does not work if the tag name and data type fields are missing from the spreadsheet file Importing DAQ Memory Tags Allows you to import existing DAQ Virtual Channels and create tags for them National Instruments Corporation 6 11 LabVIEW DSC Module Course Manual Optional Exercise 6 2 Exercise 6 2 Edit a Large SCF File Approximate time to complete 15 min Page 6 28 To demonstrate how to export a large file of tags to edit the file in a spreadsheet editor and to import it back into the Tag Configuration Editor OBJECTIVE LabVIEW DSC Module Course Manual 6 12 ni com Using the Tag Monitor e Can read or write tags locally or over a network Drag and drop tags into the monitoring window
166. nge at ni com exchange National Instruments Application Engineers make sure every question receives an answer For information about other technical support options in your area go to ni com services or contact your local branch at ni com contact e System Integration lIf you have time constraints limited in house technical resources or other project challenges National Instruments Alliance Partner members can help The NI Alliance Partners joins system integrators consultants and hardware vendors to provide comprehensive service and expertise to customers The program ensures qualified specialized assistance for application and system development To learn more call your local NI office or visit ni com alliance If you searched ni com and could not find the answers you need contact your local office or NI corporate headquarters Phone numbers for our worldwide offices are listed at the front of this manual You also can visit the Worldwide Offices section of ni com niglobal to access the branch office Web sites which provide up to date contact information support phone numbers email addresses and current events National Instruments Corporation A 1 LabVIEW DSC Module Course Manual Appendix A Additional Information and Resources Other National Instruments Training Courses National Instruments offers several training courses for LabVIEW users These courses continue the training you received here and expand it
167. nstruments OPCFieldPoint National Instruments OPCLookoutDrivers Run Server Configuration View Server Information Unregister Server Tanks Server These are VI Based servers servers Help Network OPC Servers OPC Client Settings Registered Computers L ce The tag engine can connect to different types of servers such as OPC servers or Vl Based servers A Vl based server is a data server that is written in LabVIEW unlike an OPC server which is typically written in Visual Basic or C Like any server a VI based server can be a real I O server for a device a simulation server or a computational server doing complex computation for your application and serving the results as items The Tag Engine can interface with any server that uses the Tag Engine Server interface LabVIEW DSC Module Course Manual 8 18 ni com DSC Tag Engine t CCDB of two parts Server VI e Registration VI ni com VI Based Servers gt LabVIEW Data Vl Based Server VI gt Real world I O V Based Server Registration VI A VI Based Server consists All Functions DSC Module DSC Module Server development Server VIs Registration Vis g write read oxi Q7 NATIONAL INSTRUMENTS A VI Based server consists of two pa
168. nt from the SCF file on the Server Make sure to not replace the Server SCF file with the one for the Client Deploy Client 31 Run the PID Client VI located in the C Exercises LabVIEW DSC directory 32 Make sure the PID Server VI is running on the server partner s machine Notice which Temperature Chamber you are controlling with the PID Client VI on the client machine End of Exercise 7 3 LabVIEW DSC Module Course Manual 7 48 ni com Notes National Instruments Corporation 7 49 LabVIEW DSC Module Course Manual Notes LabVIEW DSC Module Course Manual 7 50 ni com Lesson 8 Advanced Topics TOPICS A LabVIEW DSC Security B Programmatically Controlling Security C Vl Based Servers Lesson 8 Advanced Topics The LabVIEW Data Logging and Supervisory Control DSC Module provides features such as user management and security programmatic Tag Engine Control and VI Based Servers National Instruments Corporation 8 1 LabVIEW DSC Module Course Manual LabVIEW DSC Security Apply security to your VIs the TCE 3 7 individual tags and the Tag Monitor V Cand Security components 1 User Account Manager User Account Manager 2 Security Wizard e Login settings 3 Login Settings Security Wizard tools access CE Settings 4 Tools Access Control t t t 5 TCE Settings Programmatic Control 6 Programmatic Control LabVIEW DSC Security There are two areas of secu
169. nt members of the Operators group from starting the Tag Monitor 13 Make sure you are logged on as Administrator only Administrators can edit securities Select Tools DSC Module Options and click Tools Access in the Advanced tab gt Options x Environment Startup Advanced 7 Preload tag editor when LabVIEW starts IV Close Tag Monitor when LabVIEW exits IV Close Image Navigator when LabVIEW exits System Log C Program Files N ational i lm 4 Instruments LabViEW 7 0 is IV Use default location Proxy User Registered Computers Engine User q Tools Access Settee r Time Synchronization Security Preferences LabVIEW DSC Module Course Manual 8 24 ni com 14 Select the Tag Monitor tab in the new dialog box Notice that Everyone has access to the Tag Monitor You will allow Everyone to have access but you will exclude the Operators group 15 Click the Edit button 16 In the Access Rights dialog box click the Add button 17 The Add Users and Groups dialog box lists all available user and group accounts in the Names section Highlight Operators and click the Add button Make sure the Access Rights listbox shows No Access Click the OK button four times to close the open dialog boxes and return to LabVIEW Access Rights Tag Monitor User or Group Everyone Access Cancel Add E xi Add Users and Groups xj Domain Loc
170. o are logged First the ID Tag for the data set is specified Next the Run Tag is enabled This ensures that logging is enabled for that particular data set In the next frame data is written to the tag and thus logged to the data set Finally the Run Tag is disabled by passing a FALSE constant to it You can toggle the Run Tag programmatically or even with a hardware trigger You can do this by configuring a tag for the hardware trigger you want to use National Instruments Corporation 5 5 LabVIEW DSC Module Course Manual Retrieving Data Sets List Data Sets Returns the list of data sets that exist within a specific database timeout 30 s database URL database URL out data set information traces error in Tees error out List Data Set Runs Returns the list of completed data runs that belong to a specific data set timeout 30 s multicolumn listbox database URL database URL out data set information trace data runs get all runs info false error out error in no error Read Data Set Run By ID Extracts data for one or more data runs whose run ID or internal ID match the ID specified by the run ID or internal ID input timeout 30 s internal id matching data sets database URL database URL out data set information trace get all runs info false run id error in no error first match data first match run id Per Retrieving Data Sets
171. odule Course Manual Student Guide A NI Certification The LabVIEW Datalogging and Supervisory Control Module course is part of a series of courses designed to build your proficiency with LabVIEW and help you prepare for exams to become an NI Certified LabVIEW Developer and NI Certified LabVIEW Architect The following illustration shows the courses that are part of the LabVIEW training series Refer to ni com training for more information about NI Certification LabVIEW Series LabVIEW Experience LabVIEW LabVIEW LabVIEW Advanced Basics Basics Il Application Introduction Development Development Certified LabVIEW Developer Certified LabVIEW Architect Exam Certification Track Data Acquisition and Signal Conditioning LabVIEW Instrument Control Machine Vision and Image Processing Motion Control Fundamentals LabVIEW Real Time He Application Development LabVIEW Internet Applications LabVIEW Datalogging gt and Supervisory Control Module LabVIEW DSC Module Course Manual vi ni com Student Guide B Course Description The LabVIEW Datalogging and Supervisory Control Module course teaches you to use the LabVIEW Datalogging and Supervisory Control Module to develop datalogging and supervisory control applications This course assumes you have a level of experience with LabVIEW equivalent to completing the material in the LabVIEW Basics I Intro
172. offers a set of PID Toolkit VIs that include the control algorithms for the classic PID control setup The toolkit also offers Fuzzy Logic control tools The PID Control Toolkit is used in Exercise 7 1 Creating a Server for Control to implement a control algorithm with the DSC Module A PID loop controls the temperature in the chamber based on a setpoint LabVIEW DSC Module Course Manual 7 6 ni com Introduction to PID Toolkit e PID Control Toolkit PID Control Fuzzy Logic Advanced Control Now review the PID Control Toolkit that will be used in the next exercise On the Functions palette open and view the palettes available in the PID Control Toolkit The specific VI that is used in this example is the PID vi This VI employs a PID algorithm for simple PID applications or high speed control applications National Instruments Corporation 7 7 LabVIEW DSC Module Course Manual Exercise 7 1 PID Control Server Approximate time to complete 20 min Page 7 28 To use the DSC Module and PID Toolkit to control the response of the temperature chamber with a setpoint OBJECTIVE This exercise uses the PID Toolkit LabVIEW DSC Module Course Manual 7 8 ni com gt gt gt Client Philosophy Review e Clean clear design of relevant values and their meanings Use HMI Wizard to establish connections Use Panel Wizard to connect panels Intuitive descriptions of what
173. og box and then browse to the particular trace that need to be displayed Click OK If desired a more recognizable name may be assigned to the trace Also ensure that the Minimum and Maximum fields of the Properties dialog box match the range of the data being displayed Click Apply and then OK Click Start Stop Plotting in the top right corner of the NI HyperTrend control The historical data from the Citadel database should now be visible Notice that no code is generated when using this control as is the case with the HMI Wizard The NI HyperTrend is an ActiveX object It is a separate program running inside of an ActiveX container in a LabVIEW front panel LabVIEW DSC Module Course Manual 4 10 ni com E Viewing Data Sets in MAX Open MAX or go to Tools DSC Module View Historical Data Citadel 5 Universe Measurement amp Automation Explorer O x File Edit View Tools Help Configuration Al Priew Data z Refresh Options gt show Help EG my System E Data Neighborhood 4 Devices and Interfaces Ef Historical Data a Universe EB My Computer ansaha A C_Program_Files_National_Instruments_LabVIEW_7_O_data Network 21x 5 A Scales Now gt i Software AlarmsjEvents View Ga User Folder E O Remote Systems jelingo_anszha_My_Document FEE red Ramp RampXL1 il 6 ansaha C__Proaram_Files_Ne K2 Databases
174. og box has tabs for different security areas Network Data Access includes both network users and network machine names After you edit the area of interest another dialog box appears that allows you to modify the access of users or groups as well as an option to add new users or groups LabVIEW DSC Module Course Manual 8 8 ni com F File Individual Tags nl x Securing Your SC gt Tag Configuration Editor Ele Edit Tools Configure Servers if tal 210 Afia el Double click a tag and choose Security from the configuration window Tag Name poi Tag Group lt ALL gt Add additional users or groups and set their access Securing Your SCF File Individual Tags You also can set the security on a tag by tag basis If you go to the TCE and edit a tag you will see that the General tab has a Security button which accesses the Tag Data Access Rights dialog box From this dialog box you can add additional users or groups and set their access privileges National Instruments Corporation 8 9 LabVIEW DSC Module Course Manual The Security Wizard Browse Window Help 13pt Application Font Fo tar gt No Access Hidden Disabled View Only JT Set All to Match Access Full Access Cancel Add Remove _ Hep e The Security Wizard makes it easy to implement security at any time during your development You do not need to
175. ogged with a timestamp of when it changes Logging data in this manner makes it easy to determine the value at any point in time It is important to notice that data logging using LabVIEW DSC is more event driven than time driven This is evident in the manner in which data is logged based on significant change National Instruments Corporation 4 5 LabVIEW DSC Module Course Manual EE Defining Where Citadel Stores Your Data Historical Logging Configuration Select an existing Citadel database for historical data logging or 2 Wh l e you S h 0 u d n eve r enter new values to log data to a new database Press lt Ctrl H gt KRS modify Citadel files you can Lag to computer baht select the directories where Database path i j you store your files 2 WY Can be a local directory or Siew re accessed across a network Z Use the same database for event logging Historical Data and Events w Start logging on system start up Pim E can be logged to the same available 3650 Days 01 00 00 Maximum time between logs hh mm ss o r se p a ra te d j re cto ri e S OK Cancel Help NATIONAL F STRUMENTS Defining Where Citadel Stores Your Data Citadel is a networked multi client database So multiple programs may log to the same Citadel directory You can specify the logging directory in the Historical Logging Configuration dialog This dialog can be accessed when the
176. older and assign a drive letter to the connection so that you can access the Folder using My Computer Specify the drive letter for the connection and the Folder that you want to connect to Drive Z w Folder A Browse Example serverlshare Reconnect at logon Connect using a different user name Sign up For online storage or connect to a network server Cancel 25 Select the computer for the Server your partner s and then add the folder that is shared National Instruments Corporation 7 47 LabVIEW DSC Module Course Manual Importing Network Tags on the Client Machine 26 Select Tools DSC Module Configure Tags to open the Tag Configuration Editor 27 Select File Import Network Tags and navigate to the SCF file shared on the networked folder Select Tags for Network Import Data Source SCF File nirvana AE GeneraliRobert JacksoniLabYvIEW DSC 7 04 Browse L UAB 3 amp 7 Exercises LabvIEW DSC Temp Tags to View Available Tags Selected Tags Server Running Setpoint Chamber Temperature Add Add All gt gt Cooling Fan Control Heat Lamp Control Tag Information Import As Input Output Tags Import s BridgeVIEW 2 x compatible 28 The tags from the SCF file on the Server machine will appear in the Selected Tags section 29 Click the Import button 30 On the Tag Configuration Editor select File Save to save the SCF file in the LabVIEW directory The SCF file on the Client is differe
177. omputers The purpose for registering computers is so that the DSM Module does not have to check every computer on a network to find those that are using the DSC module You can register a computer by right clicking the Network Neighborhood and selecting Register Computer The Register Computer dialog box appears The Register Computer dialog box lets you browse the Windows Network Neighborhood or enter an IP address into the Computer Name field You might not be able to browse to computers that are not on the local network or to devices without an assigned host name like the FP 1600 If you cannot browse the machine you can enter the IP address or host name of the device After you select the name push the register button to register the computer After you register the machine you can expand the entry in the network neighborhood and add tags to the monitoring window just as if they were on the local system National Instruments Corporation 7 17 LabVIEW DSC Module Course Manual Synchronizing System Clocks Options eno Startup Advanced Preload tag edia Close Tag M Close Image 1 Select Options Advanced tab 2 Click Time Synchronization Click Add Find server name from network 5 Click OK for all dialog boxes d OK C 2 Time Synchronization Security NATIONAL JE STRUMENTS LabVIEW DSC Module Network Client To configure a client
178. our applications you will eventually want to obtain the values of data and the statuses of alarms within your VI While this is more complicated than the standard methods of working with your tag values and alarms the rewards from mastering these abilities of DSC are numerous Accessing these values will allow your VIs to react to the alarms and values and also will allow you to present this information in a manner precisely of your choosing Since this is more involved and prone to error than using the Wizards it is advised that you should access values and alarms programmatically only when the basic functionality will not work You can do so with the VIs provided as part of the DSC Module National Instruments Corporation 4 19 LabVIEW DSC Module Course Manual Using the Historical Data VIs timeout 30 s sample interval max points in trace all check start stop time T database URL Oe database URL out historical trace grg_p decimated trace tag name le BEZ historical trace start timestamp amp ofirst timestamp time interval H jii ran stop timestamp now SS j last timestamp error in no error error out error in no error ees error out options Read Traces vi Decimate Trace vi time on ETM quality max value last timestamp min value database URL database URL out average tag namesjtrace patterns all gt 63 trace list standard deviation error in no error plam f
179. out the account Username Password Security level and so on 3 Optionally click Groups and select the group s that the user should be a member of and click Add Note A user receives the privileges of any groups in which they are a member So adding a user to the Administrators group and the Guests group would grant all the privileges for both groups Be careful who you add to the Administrators group they have full access to all the DSC Module features including the User Account Manager LabVIEW DSC Module Course Manual 8 4 ni com Startup Options You can configure LabVIEW DSC to automatically log in or prompt mani a specific user to log in at startup skt armel Show the login prompt at LabVIEW startup time Login automatically with the LabVIEW Registration name Login automatically with the Operating System user name Login automatically using the most recently logged in user Login automatically with the following user account Name Administrator Password ESEE 1 Emvionment Startup Advanced J Preload tag editor when LabVIEW starts JZ Close Tag Monitor when LabVIEW exits 0 Close Image Navigator when LabVIEW exits IT Show login dialog if automatic login fails System Log C Program Files National Lar Instruments LabVIEW 7 0 Use default location Proxy User Engine User Registered Computers k Startup Options Often you would like to control whi
180. own computer or from across a network The wizard also allows you to select a single channel or a whole range of channels from your hardware The wizard takes care of determining all the proper data types of the channels involved It also names the tags to match the channels from the selected hardware so that you can easily identify your data and rename it if desired National Instruments Corporation 1 13 LabVIEW DSC Module Course Manual Panel Wizard Multiple panels organize and simplify the user interface for large applications Wizard attaches the appearance of a new panel to a button no programming required e Same behavior achieved by programming with subVIs in LabVIEW JF STRUMENTS Panel Wizard Many large applications require the use of many windows for the operator to navigate For example a large SCADA system for a water treatment facility might monitor many unique water control systems around the city Rather than squeeze all of the system monitoring onto one panel you can create a separate panel to view each unique system making the user interface less confusing With traditional LabVIEW programming you must program the appearance of new panels by manually creating subVIs and manipulating the visual properties of the panel to achieve the desired panel appearance With the Panel Wizard the DSC Module generates the code to achieve the desired panel navigation LabVIEW DSC Module Course Manu
181. ows the user to select the Tag the Tag Attribute and the value that they would like to set By exposing all these controls on the front panel the user has virtually unlimited control to change the settings of all the tags This helps if the operator really needs that much control The following examples are more limited All three of these examples have block diagram constants which the user cannot change that select the tag and the tag attribute to be changed They only offer a user control to set the new value Here it allows the user to turn datalogging on and off to turn the alarms on and off and to change the deadband value This example still offers the program a large amount of functionality while limiting your ability to alter programs National Instruments Corporation 6 23 LabVIEW DSC Module Course Manual Summary Proper tag management reduces development time e Deadbanding can improve program execution Tag Configuration Wizard I O groups and default parameters help with large tag counts e Reading and writing from the block diagram is necessary to create feedback loops e Tag attributes can be changed programmatically LabVIEW DSC Module Course Manual 6 24 ni com Exercise 6 1 The Effects of Deadbanding Objective To view the effects of deadbanding on data update rates Start LabVIEW and open a blank VI 1 2 3 Select Tools DSC Module Configure Tags to open the Tag Configuration Ed
182. p below 74 to go out of alarm This eliminates the problem of causing multiple alarms while a noisy signal hovers about the alarm value Log Deadband of range This deadband allows you to limit the data that is being logged to the database To get the most efficient use of hard drive space the Citadel database only logs data on change If a log deadband is set then Citadel only logs data if it changes by more than the deadband LabVIEW DSC Module Course Manual 6 4 ni com Tag Attributes Operations gt Analog Tag Configuration tempdse xl E n g j n e General Connection Operations Scaling Alarms m Engine e Set deadband for updating Update Deadband of range 050 5 Set Initial Value oo values on the engine e Set initial value on the engine m Logging Data and Events 4 Log Print Events I Log Data Log Deadband of range 1 Log Resolution engineering units 0 01 Cancel ni com NATIONAL F STRUMENTS Tag Attributes Operations Update Deadband of range Determines when the Engine updates the tag with a new value For analog tags the Update Deadband is a percent of the full scale defined on the Scaling tab Use 0 if you want each value read for the tag to always update the database For discrete string and bit array tags Update Deadband is expressed as either Always or On Change With Always the value is treated as new and the timestamp is updated each time
183. pe cmd At the command prompt type ipconfig IP Address 2 Exchange IP Addresses with your neighbor 3 On your computer type ping lt ip address of neighbor s computer gt AWINNT System32 cmd exe Microsoft Windows XP Version 5 1 2666 lt C Copyright 1985 2661 Microsoft Corp Q gt ping 16 6 34 41 Pinging 16 6 34 41 with 32 bytes of data 18 6 34 41 bytes 32 time lt ims TTL 128 16 6 34 41 bytes 32 time lt ims TTL 128 18 68 34 41 bytes 32 time lt ims TTL 128 18 8 34 41 bytes 32 time lt ims TTL 128 Ping statistics for 16 6 34 41 Packets Sent 4 Received 4 Lost Bz loss gt Approximate round trip times in milli seconds Minimum ms Maximum ms Average Gms M Configure the Client Machine 4 From LabVIEW select Tools DSC Module Monitor Tags to open the Tag Monitor 5 Expand My Network Places and locate the server machine your partner s computer National Instruments Corporation 7 41 LabVIEW DSC Module Course Manual 6 Expand LabVIEW and double click each Network Tag to add it to the Full Name field in the Tag Monitor pf Untitled National Instruments Tag Monitor File View Items Options Help I dmcclelland A W FPATWA 1 9 robj LabVIEW Setpoint Setpoint 102 12 30 2003 9 21 39 4 lkunitz T WrobjiLabVIEW Server Running Server Ru False 12 30 2003 9 23 38 J MSHASTEEN 1 9 robj LabVIEW Heat Lamp C Heat Lamp 5 17704534531 12 30 2003 9 23 38 Y nate 1 9 rob
184. r Hardware Complete the following steps for selecting the proper hardware 1 Analyze Your Needs What phenomena do you want to measure and control Is it temperature humidity distance and so on Make a list of each signal to be monitored or process to be controlled 2 Choose Appropriate Sensors and Controls Inputs Determine what type of sensor you need to measure each of your inputs For each type of signal write down the output of the sensor which is usually a voltage a current or a digital pulse e Outputs Determine what type of outputs you need to control each process List all the output signals that you need to control the process 3 Choose Proper Hardware Find proper hardware to input and output voltages currents and digital signals Some common choices include the following e FieldPoint Compact rugged Programmable Automation Controllers PACs that can easily be distributed throughout a factory and monitored over a network e Data Acquisition Boards Computer based hardware that is best for high speed data acquisition near a PC e PLCs Third party Programmable Logic Controllers National Instruments Corporation 2 3 LabVIEW DSC Module Course Manual OPC Interface to the Hardware Your Computer Forms backbone of DSC allowing tags to access data BO E OLE for Process Control OPC m gt Industry standard for compatibility pe y i Multi vendor interoperability
185. r VIs the Tag Configuration Editor TCE and the Tag Engine The TCE allows you to determine which channels of your hardware connect to which tags and how the channels connect Like other frequently used DSC features the TCE includes a wizard to speed your development and simplify the tag creation process The wizard allows you to list your hardware items create tags and then save lists of tags in SCF files The Tag Engine runs in the background The tags that are configured in the Tag Engine get updated and read by the OPC Servers The application then can read and write directly from the Tag Engine The Tag Engine provides direct access to hardware values of multiple OPC Servers all in one place National Instruments Corporation 2 7 LabVIEW DSC Module Course Manual m Using the Tag Configuration Editor TCE The Three Most Important TCE Tools a i Tag Configuration Editor motor scf LabvIEW Edit Tools Configure Servers Window Help HBA H Analog Input Analog Input Mg PMSetPoint Analog Input Output etl ID Tag String Memory Load Save or Create a New SCF File e Configuration Wizard Set1 Run Tag Discrete Memory Set1_active Discrete Input e Create New Tags sz JERSTRUMENTS Using the Tag Configuration Editor Because the TCE provides to you the ability to define and customize your tags you understand must what it does and how to use it You can launch
186. r a tag from the Tag Engine This VI indicates if a tag is in alarm which alarm state it is in when the alarm occurred at which value it occurred and whether it has been acknowledged Alarm amp Event Query VI Use this VI to extract data from a historical alarm and event database If you also supply a valid control reference to a table or multicolumn listbox the query results will be sent to the control Get Alarm Summary Status VI Use this VI to check the status of alarms in the system The information returned includes whether any tag is in alarm how many tags are in alarm how many of these alarms are unacknowledged and if any tag has an unacknowledged alarm Acknowledge Alarm VI Use this VI to acknowledge alarms from your application You can acknowledge the alarm condition of a single tag or a group of tags For example you can call it when a button is pressed in your HMI Read Event History VI Use this VI to display all the alarms and events that have occurred since the Tag Engine started for a set of tags or tag groups within a given alarm priority range You also can filter out acknowledged alarms Additional details on each of the above functions can be found in the Context Help and the LabVIEW Help National Instruments Corporation 4 21 LabVIEW DSC Module Course Manual Summary How do I make sure that tag data and events are logged When is a tag logged e How is Deadband calculated What
187. r creating an intuitive front panel that mimics the real world application that you are collecting data from or controlling LabVIEW DSC includes an Image Navigator that contains pictures to help you create a more advanced user interface for your applications LabVIEW DSC Module Course Manual 3 4 ni com Using HMI Wizard to Speed Development View Data in Two Steps Light Intensity Fan Speed Sp NIE PI 1 Right click a control or a o indicator and select HMI aal 207 Visible L gt Wiza rd p Tag Value P gt EST 2 A Select an existing tag 1GA Frequency gt a CETE r Indicator e K Create gt Or Temper Replace gt JV Match control label to tag name avid 3 B Create a new tag and v Match scale to tag configuration Max 10 00 cums the control indicator link to Min oc fice gt that tag Plone OK Cancel ni com NATIONAL JERSTRUMENTS How Do I Use HMI Wizard to Speed Development You can use the HMI Wizard to connect to your data in two easy steps After you have a control or indicator for the desired tag type right click it and select HMI Wizard Then simply select the desired tag or create your own This is all that is required to quickly connect a front panel control or indicator to a tag The HMI wizard is a critical component of the DSC Module speeds up your development time and is used throughout the development of DSC applications National Instru
188. re Servers Window Help 218 Zle BIE Chamber Temperature Cooling Fan Control Heat Lamp Control Server Running Setpoint National Instruments Corporation Analog Analog Analog Discrete Analog 7 35 Tag Acces Input Input Out Input Out Memory Memory LabVIEW DSC Module Course Manual d Save the SCF e When prompted click the Yes button to restart the Tag Engine The SCF file has been saved Do you want to shutdown and restart the Tag Engine with the changes from this SCF file 4 Close the Tag Configuration Editor Block Diagram 1 Open the block diagram for the PID Server Ex 7 1 VI and modify the code 2 Place the Setpoint control inside the PID While Loop to control the setpoint a Place the control inside the While Loop b Connect broken wires so the Setpoint control is wired to the Setpoint input for the PID VI and to the Merge Signals Express VI 3 Adda Write Tag VI to the PID While Loop to update when the server is running a Place a Write Tag VI located on the Functions All Functions DSC Module VIs Tags palette on the block diagram b Right click the Tag Name input and select Create Constant from the shortcut menu Select the Server Running tag c Right click the value input of the Write Tag VI and select Create Constant from the shortcut menu b DOUOUUUUUUUUUUUUUUUN Setpoint Setpoint EEE aveform Chart Heat Lamp Control fv Server
189. re that is generally provided by the hardware manufacturer You will need to configure the server correctly but you generally will not need to program the server The LabVIEW DSC Tag Engine is already written as an OPC client You will have to configure the DSC Module communicates with the OPC server but it will not necessarily require programming LabVIEW DSC Module Course Manual 2 4 ni com EE Verifying OPC Connections Verify proper readings with Server Explorer File Servers Edit View Options Help Das 2 J2 4 using Wizards E a My Computer no 1 Use OPC Wizard with the server See 2 Connect to the server and name its group 3 Choose the channels to test Available OPC Items Selected OPC Items Connect to server E CE myn Properties Add Edit Groups Delete Moto PMSensor MotorRPMSetPoint SINE 0 0 8 0 2 0 SINE 1 0 5 0 10 0 SINE 2 0 6 0 3 0 fb SQUARE 1 0 5 0 0 5 SQUARE 1 0 5 0 3 0 b VT_BOOL vT_BOOLI b VT_BOOL2 fb VT_I2 1 0 1000 0 P YT _12 1 0 1000 0 z 4 A Map Network Server Server OPCDemo Machine MOPTIPLEXGX111 Run As Local Server EXE s Connected to server gt ed ni com NATIONAL F STRUMENTS Verifying OPC Connections When connecting your hardware it often is useful to verify that your hardware is reading data correctly and that it is being properly sent to the computer Doing this e
190. rity in the DSC Module The first area is the LabVIEW environment itself Here you can restrict access to controls and indicators to certain users or groups of users by using the Security Wizard The second area is in the Tag Configuration Editor TCE You can implement security so that certain users cannot change the SCF file by adding removing tags or changing any of the other settings in the TCE You also can implement network security to restrict tag access to specified computers or IP addresses LabVIEW DSC Module Course Manual 8 2 ni com The User Account Manager pf National Instruments User Account Manager 10 x User Options Help Full Name The User Account Manager is where new user accounts are CBE ZEB gt Groupne Description created and added to groups and ga nto caf their security privileges managed 4 a 4 System Operators Members granted system level access to the system Groups make it easy to apply security settings to a whole set of users simultaneously TEE INSTRUMENTS The User Account Manager The first step to using security is creating user accounts and organizing them into groups through the User Account Manager To use the User Account Manager select Tools DSC Module Security Edit User Accounts Here you can create and modify accounts for all users of the application and set the security level for users or groups of users To create a new user choose Us
191. rk Tags e Synchronize Windows clocks e Share Windows directories e Import Network Tags an JF STRUMENTS There are three major steps for configuring client VIs The details are outlined in the following slides The LabVIEW DSC Module Run Time Engine is required After installing the Run Time engine synchronize the clocks on the two computers and then share the Windows folders used for database access Finally import network tags from the local machine LabVIEW DSC Module Course Manual 7 14 ni com Install DSC Run Time Engine The DSC Module Run Time Engine is required Configure networked tags on a client Quickly deploy the client to a networked machine e Executables built with LabVIEW Application Builder Place in the DSC Module Run Time folder Ensure correct tags before deploying ssj JF STRUMENTS The first step when deploying DSC Module clients to networked machines is to install the DSC Module Run Time Engine on the client machine This is not a free Run Time license Visit ni com and for more information You can build an executable with the Application Builder but you must place it in the LabVIEW DSC Module Run Time folder with DSCengine exe on the client PC National Instruments Corporation 7 15 LabVIEW DSC Module Course Manual Testing the Network e Can you ping from one machine to another If not talk to your network administrator e T
192. rol _ r Cooling Fan Con 9 72 URL ene 4 Connect the STOP button on the block diagram a Place a Not function located on the Functions Arithmetic amp Comparison Express Boolean palette on the block diagram b Place an Or function located on the Functions Arithmetic amp Comparison Express Boolean palette on the block diagram 5 Connect the Stop button to the top input for the Or function National Instruments Corporation 7 39 LabVIEW DSC Module Course Manual 6 Connect the Running output from the Engine Status VI to the Not function and then to the bottom input for the Or function al i Engine Status 7 Save the Vlas PID Client Ex 7 2 viinthe C Exercises LabVIEW DSC directory 8 Run the Client VI and change Setpoint value Watch it also update the server 9 Notice the operation of Server Running when you start and stop the PID Server VI End of Exercise 7 2 LabVIEW DSC Module Course Manual 7 40 ni com Exercise 7 3 Deploying a Client to a Remote Machine Objective To deploy the PID client created in the previous exercise to a networked machine In this exercise you will work with a colleague Using the Client you created and a networked SCF file you will control the Temperature Chamber on the Server computer partner s machine from the client machine your computer Test IP Address 1 To determine the IP address of your computer click Start Run and ty
193. rts a server VI and a registration VI The Registration VI only needs to run once It s purpose is to create an entry in a CCDB Common Configuration Database file that is accessible to the tag engine and inserts information such as the data items and the path to the server VI When the Tag Engine starts it launches the Server VI which then communicates between the engine and the I O points real world I O or other I O points For more information on using VI Based servers refer to the following zone ni com search for VI Based server Shipping examples in LabVIEW select Example Finder Toolkits and Modules Datalogging and Supervisory Control Servers e VI Based Server Development Toolkit Reference Manual National Instruments LabVIEW 7 0 manuals National Instruments Corporation 8 19 LabVIEW DSC Module Course Manual Optional Exercise 8 4 Using a Vl Based Server to Create a New Tag Approximate time to complete 30 min Page 8 30 To modify and run a Vl based server example to create a new I O tag Create a VI that writes and reads from this tag OBJECTIVE PATION r Optional Exercise 8 4 The following are the objectives of this exercise To become familiar with the DSC Module Server Registration VIs to add a new tag to an existing VI based server To read and write from the new tag added to the VI based server LabVIEW DSC Module Course Manual 8 20 ni com
194. ry using Tag Monitor to view network tags af pproximate round trip ti Minimum Oms Maximum C WINDOWS gt _ UE INSTRUMENTS Testing the Network Before using the LabVIEW Datalogging and Supervisory Control module network functionality you should ensure that you have a correctly functioning network The easiest way to test the network is to try the ping command To try pinging a machine start at an MS DOS prompt and type ping lt hostname gt Ping is a program that sends a test packet to the host and checks how long it takes to reply If you get no response then your network is incorrectly configured You must have a network setup that supports the TCP IP protocol You might want to talk with your network administrator department for additional help If you can ping hosts on the network then you can try using the Tag Monitor to read write network tags from those machines The following slide details using the Tag Monitor to check network tags LabVIEW DSC Module Course Manual 7 16 ni com View available Network Tags 2 Untitled National Instruments Tag Monitor oj x File View Items Help Name Value Timestamp Quality Register Computer x Select Computer p Computer Name REMO s M i Begister x NATIONAL JE STRUMENTS Monitoring Network Tags When you expand the Network Neighborhood in the Tag Monitor you see a list of all registered c
195. s Select Tools DSC Module Launch Engine to start the Tag Engine National Instruments Corporation 2 17 LabVIEW DSC Module Course Manual Using the Tag Engine The Tag Engine will ZAD J start and stop automatically GO SIE as your VI requires it These Administyet controls are not needed in those cases You can change the SCF loaded at the Default SCF at Tools DSC Module Options Mor scf LabVIEW Start the Engine Stop the Engine Using the Tag Engine Using the Tag Engine is quite simple LabVIEW will by default run the Tag Engine when a VI containing tags is run For normal usage you never must manually start and stop the VI However occasionally situations arise where you must control the Tag Engine In addition to starting and stopping the Tag Engine you might also need to change the SCF files This can be done by selecting Tools DSC Module Options and then changing the default SCF file LabVIEW DSC Module Course Manual 2 18 ni com Summary e DSC developing basics e Understanding hardware e Tags What are they How do you use them Lesson Summary With this lesson you have gained a better understanding the DSC Module You now know how to configure tags both for testing and for your own hardware You also have the knowledge to begin designing your VI and use tags to improve interoperability You know how to use Tag Groups and SCF files to
196. s Corporation 5 25 LabVIEW DSC Module Course Manual Retrieving Data with Data Set VIs 1 Optional To view a more complex and sophisticated data set viewer open the NI Example Finder and navigate to Open and run the Ex 5 1 Simple Data Sets Viewer VI located in the c Solutions LabVIEW DSC Lesson 5 5 1 directory Examine the block diagram shown in Figure 5 1k It uses the List Data Set Runs VI to display all the runs in the specified data set When a data set run is selected the Read Data Set Run by Id VI reads the run and displays it The x axis limits also are set using Property Nodes to display just one run You can use the zoom tools of the graph to view the entire data set Default selected run is none Sets the time axis range Historical Data i i let o i internal id jy Z Multicolumntistbox Lema DBL _ The comparison checks if check if user has not selected a new run This VI retrieves the data of the selected run The run is passedin by its internal id i This YI lists all runs motor tests within the specified set Set1 The result populates the Data Runs MulticolumnsListbox The user can then select a run from the list on the panel Fi Figure 5 1k Simple Data Sets Viewer VI Block Diagram the Data Sets Viewer VI located in the Toolsets and Modules Datalogging and Supervisory Control Retrieving Historical Dat
197. s with long lists of channels this reduces the time it takes to create all the tags that you need Using this tag with properly chosen default parameters allows for quick tag creation National Instruments Corporation 6 9 LabVIEW DSC Module Course Manual Why Would I Use I O Groups IB Analog Tay Configuation Molo PHSensor General Connection Operations Scaling Alams e I O Groups control update rates ere Allows different channels to tee ag update at different rates Desdband ofrange 1 00 Less processor usage moe Server Name NatonalinstumentsOPCDemo More efficient programs se National Instruments OPCDemo v Group Description J Update Rate secs 1 20 INSTRUMENTS N NATIONAL I O Groups In the DSC Module I O Groups define how fast items are read from the server and when a value is considered to be changed by the OPC server if the server supports deadbanding By default the DSC Module creates one group for each server You may have multiple groups for a single server but you should not have one group include two different servers The typical use for multiple groups would be to have one group of tags read at a slow rate and one group of tags that is read at a faster rate What should I choose for my update rate To some extent this will be system specific but generally Windows cannot reliably do anything faster than once every
198. se 7 3 Deploying a Client to a Remote Machine Approximate time to complete 15 min Page 7 41 To distribute the client created in Exercise 7 2 to another computer and control the setpoint on the server machine OBJECTIVE National Instruments Corporation 7 21 LabVIEW DSC Module Course Manual Application Specifics for DSC Module Clients e Details of LabVIEW Client e Details for a Lookout Client e Remote Citadel LabVIEW Ele Edt Tools Help T4 LabVIEW xpress LabVIEW for Windows The following slides cover the application specifics of integrating the DSC Module with regular LabVIEW applications or with Lookout applications In the setup discussed the DSC Module functions as the server and either a LabVIEW or Lookout client accesses data from the DSC Module server The LabVIEW client without the DSC Module installed uses the functionality of front panel DataSocket but the advanced features of the DSC Module are not available in this setup LabVIEW DSC Module Course Manual 7 22 ni com LabVIEW Client Machine LabVIEW Client Process LabVIEW Client Architecture LV DSC Module Server Machine Server Tag Engine Read Write Tags VI connects to Engine using Front Panel DataSocket No LabVIEW interface to Citadel ni com Can be a LabVIEW executable N I O Hardware
199. select Create Property Node from the shortcut menu Click the Light Intensity Property Node and select the Colors 4 property Right click the input to the Property Node and select Create Constant from the shortcut menu Replace the numbers in the cluster with a color box constant located on the Functions All Functions Numeric Additional Numeric Constants palette Place an Index Array function and a Build Array function located on the Functions All Functions Array palette on the block diagram Place an Unbundle function and a Bundle function located on the Functions All Functions Cluster palette on the block diagram Place a Subtract function located on the Functions Arithmetic and Compare Numeric palette on the block diagram Add a local variable to the block diagram Right click the Light Intensity control and select Create Local Variable from the shortcut menu This will reserve the control for use with the HMI Wizard in the next exercise National Instruments Corporation 3 23 LabVIEW DSC Module Course Manual 4 Arrange the functions and complete the wiring necessary to complete the top While Loop Add a Wait Function located on the Functions All Functions Time and Dialog palette to the While Loop 5 Inthe bottom While Loop create code necessary to adjust the speed of the Spinning Fan indicator a Right click the Spinning Fan indicator and select Create Local Variable from the shortcut menu to create a loca
200. ses Solutions a folder containing the solutions to each exercise D Installing the Course Software Complete the following steps to install the course software 1 2 E Course Goals Insert the course CD Copy the contents to the top level of the C directory This course presents the following topics Using LabVIEW to build high channel count applications Developing network applications for distributed control Implementing security within LabVIEW applications Developing applications with automatic datalogging full alarm management and event logging Developing a human machine interface HMI for your application Logging and extracting historical data This course does not present any of the following topics LabVIEW DSC Module Course Manual Information and concepts covered in LabVIEW Basics I Introduction course Control PID and or Fuzzy Logic theory Analog to digital A D theory Operation of GPIB RS 232 Motion CAN or VISA Every built in LabVIEW object function or library VI refer to the LabVIEW Help for more information about LabVIEW features not described in this course Development of a complete application for any student in the class refer to the NI Example Finder available by selecting Help Find Examples for example VIs you can use and incorporate into VIs you create viii ni com Student Guide F Course Conventions gt w bold italic monospace
201. t Panel variable in LabVIEW LabVIEW DSC Module Course Manual 3 6 ni com l Unlocking and Modifying the Generated Code HMI Wizard locks code to prevent accidental modification e Unlock code by right clicking the lock icon seee 6 To add code unlock the code Frequency v Frequency is ieee pO and modify ni com Unlocking and Modifying the Generated Code Code generated by the HMI Wizard is initially locked on the block diagram Locking code allows users the opportunity to examine the code without the worry of accidental modification However to unlock the code of the HMI Wizard simply right click the lock and select Release Wizard Lock The ability to generate code allows new DSC Module users to quickly create applications The ability to unlock and modify code reduces development time for experienced users Code generated by HMI Wizard serves as a starting point for advanced applications Important Note After you unlock code you cannot relock it The HMI Wizard modifies code that has not been unlocked Also using the HMI Wizard to modify unlocked code is not recommended because it recreates the code National Instruments Corporation 3 7 LabVIEW DSC Module Course Manual Image Navigator e Image navigator provides a set of graphics for TATY LabVIEW DSC e Import pictures onto the front panel to repr
202. t and MotorRPMSensor tags to the set Click the OK button and save changes when prompted Read the following caution regarding the dialog that appears next Click the OK button Caution At this point the configuration itself is done However you must make sure the Data Set Logger gets launched when you start the Tag Engine The most efficient way to ensure the Tag Engine will start the Data Set Logger is to include at least one Data Set Logger item in the SCF file as in Figure 5 1d Select Edit Configuration Wizard to launch the Configuration Wizard LabVIEW DSC Module Course Manual 5 22 ni com 10 Navigate to Data Set Logger RPM Data Set select the active tag and click the Add Item s button to add it Click the OK button I gt Select Items for Automatic Tag Generation Servers Selected Items Data Set Logger APM Data Set_active H RPM Data Set AB active Add Item s gt gt A currentid A desc Add as Range AB end_condition rz s a i gt Tag Configuration Editor dataset scf LabYIEW File Edit Tools Configure Servers Window Help Zao EE Tagnone tag Group Data Type Tag access MotorRPMSensor Analog Input MotorRPMSetPoint Analog Input Output RPM Data Set ID Tag String Memory RPM Data Set Run Tag Discrete Memory RPM Data Set_active Discrete Input Figure 5 1d Adding a Tag From the Data Set Logger to the SCF file 11 Save the SCF file and restart the tag engine if it is already running so t
203. tabase name and click Add to view all the data stored in it Click the OK button 4 Notice the tags are listed in the Trace Properties tab Click the Display tab to display historical data for all the tags Click the Start Stop Plotting switch on the top right corner to view the data 5 To view more recent data run the Exercise 4 1 VI and change the fan and light settings Notice that this display behaves and looks similar to the NI HyperTrend indicator in LabVIEW 6 Stop the Exercise 4 1 VI Notice that MAX continues logging Click the Start Stop Plotting switch on the top right corner to stop logging Challenge View Historical Data using ActiveX Use an ActiveX container located on the Controls Palette All Controls Containers ActiveX Containers palette to view historical data logged by Citadel Hint The NI HyperTrend indicator in LabVIEW is actually an ActiveX object End of Exercise 4 1 National Instruments Corporation 4 29 LabVIEW DSC Module Course Manual Exercise 4 2 Using Alarms Objective Configuring alarms and viewing them in LabVIEW View alarms using Alarm 8 Events Display 1 Open the Exercise 4 1 VI Select File Save As and save it as Exercise 4 2 VI inthe C Exercises LabVIEW DSC directory Select Tools DSC Module Configure Tags to open the Tag Configuration Editor Double click the Chamber Temperature tag to open the tag configuration dialog box Click the Alarms tab and place a checkm
204. that can write to the setpoint for the PID Server and read values from the DSC Module Tag Engine OBJECTIVE In Exercise 7 2 you create a DSC Module client that can access tags and serve as a remote client in your DSC Module application National Instruments Corporation 7 11 LabVIEW DSC Module Course Manual C Client Server Architecture Network System DSC Module Client Machine DSC Module Server Machine Client VIs Citadel PAON TS Read Write ags Transparent Tags HMI Wizard Access to Server Tags Client Tag Engine Must Have DSC Module Runtime system installed Server Tag Engine t I O Hardware j NATIONAL JO STRUMENTS ni com LabVIEW DSC Module Network Architecture In a networked environment with multiple computers the DSC Module architecture is similar to the architecture for a stand alone system The major difference in the setup is that a client is running on a different machine on the network Communication between the Server machine Tag Engine and the client machine Tag Engine is transparent to the DSC Module The Tag Engine of the client uses network tags to communicate with the server Tag Engine The client uses the HMI Wizard to read or write to the same tag names that were configured for the local system The client system also can access the database files of the server although it requires modifying the block diagram Bec
205. that the hypertrend continues logging Click the Start Stop Plotting switch on the top right corner to stop logging Also notice that no block diagram code is generated for this object 10 Save the VI LabVIEW DSC Module Course Manual 4 28 ni com Part E View Historical Data using MAX 1 Open MAX Select Historical Data and right click Citadel 5 Universe Click New Trace View to create a new trace view under Citadel 5 in MAX 2 Right click New Trace View and select Add Remove from the shortcut menu to add or remove traces from this view Qe New Trace Yiew Measurement amp Automation Explorer a File Edit View Tools Help Configuration A E Add Remove S Archive fp Export to Text o x gt show Help 3 My System Data Neighborhood Devices and Interfaces Ef Historical Data E 9 Citadel 5 Universe 10 New Trace View H Scales EK fey Software H LEJ Remote Systems 8 Archive Export gt Gl Delete Rename b View Data Set Run 3 26 2004 6 42 15 PM Central Standard Ti K a gt l p entral Standard Time 1 06 42 00 PM Add Remove Traces and Data Set R Duplicate 3 Under My Computer navigate to the database name where you are storing logged data from the temperature chamber Select the Chamber Temperature tag and click Add Add other tags if you want to see their historical data You also can select the da
206. tings in the DSC Module Each is important in eliminating unnecessary data processing and data logging T O Group Deadband of range This deadband is applied to the OPC Server itself I O group deadband is a percentage of the total range defined by the OPC Server When set the OPC Server does not send an interrupt to the Tag Engine to update a value unless the value change is greater than the deadband The I O Group Deadband is a part of the OPC Server subscription that is defined in the I O Group Like other settings in the I O Group the I O group deadband is a request that is sent to the OPC Server The OPC Server can ignore the I O group deadband For example it is ignored by the FieldPoint OPC Server Update Deadband of range This deadband is similar to the I O Group Deadband but it is applied to the Tag Engine The update deadband is a percentage of the Engineering Scale When this is set the Tag Engine ignores updates from the OPC Server if the value change is not greater than the deadband Alarm Deadband of range This deadband is also a percentage of the engineering scale The alarm deadband acts like a hysteresis in that the tag does not return to a normal state until it has left the alarm condition by at least Alarm Deadband For example if the range is 0 100 and the Alarm Deadband is 1 and you have a HI Alarm set at 75 if the tag value goes above 75 the tag is in alarm After the tag is in alarm the value must dro
207. to other areas Visit ni com training to purchase course materials or sign up for instructor led hands on courses at locations around the world National Instruments Certification Earning an NI certification acknowledges your expertise in working with NI products and technologies The measurement and automation industry your employer clients and peers recognize your NI certification credential as a symbol of the skills and knowledge you have gained through experience areas Visit ni com training for more information about the NI certification program LabVIEW Resources This section describes how you can receive more information regarding LabVIEW LabVIEW Publications The following publications offer more information about LabVIEW LabVIEW Technical Resource LTR Newsletter Subscribe to LabVIEW Technical Resource to discover tips and techniques for developing LabVIEW applications This quarterly publication offers detailed technical information for novice users and advanced users In addition every issue contains a disk of LabVIEW VIs and utilities that implement methods covered in that issue To order the LabVIEW Technical Resource contact LTR publishing at 214 706 0587 or visit www ltxrpub com LabVIEW Books Many books have been written about LabVIEW programming and applications The National Instruments Web site contains a list of all the LabVIEW books and links to places to purchase these books LabVIE
208. ton gt Select Items for Automatic Tag Generation x Servers Selected Items Cookie Factory MotorRPMSensor En Data Set Logger Motor RPM SetPoint El Dummy Server 5 National Instruments DaqO pe Add as Range FH El National Instruments Lookout0PCServer S National Instruments OPCDemo El NI OPC Demo Server Analog Items Created Items Remove All _ Digital Items E Remove ltem s Function Items int E National Instruments OPCFieldPoint Item Properties 4 B National Instruments OPCLookoutDrivers Server Name Registered Computers E Tanks Server Tag Name Set Tag Defauts DataSocket Properties OK Cancel Figure 5 1a Add Simulated Tags to SCF File Note You will use the OPCDemo to simulate the device The OPCDemo reads the value of the setpoint and tries to adjust the sensor value to it with some time delay The delay creates an impression of a real device LabVIEW DSC Module Course Manual 5 20 ni com 4 Create two additional tags the Chamber Temperature Heat Lamp Control and Cooling Fan Control tags should already exist a b Create a string memory tag and name it RPM Data Set ID Tag In this example you will identify each run by a string with the following format Test HH24 MM SsS for example Test 14 58 33 The timestamp is taken when the test starts The ID can be
209. tor accesses to determine which tags are available 4 On the front panel the array labeled Item Info currently has three items in it dummy_input dummy_output and dummy_Io Add another element to the array so that your VI Based server contains four tags Increment the array to element 3 and enter the information as shown in the following figure LabVIEW DSC Module Course Manual 8 30 ni com Run the VI and close it when it is finished Select Tools DSC Module Configure Tags to open the Tag Configuration Editor Select File New to create a new SCF file Accept the default values on the next window Save the SCF file as VI_Based Server scf and accept the default settings SOK COs TAN Gy an Click the Configuration Wizard select the item called My Temp from the Dummy Server and click the Add Items s button to add a tag gt Select Items for Automatic Tag Generation S x Servers Selected Items Cookie Factory My Temp Data Set Logger Demo Add ltem s gt gt Dummy Server 2 Dummy Device Add as Range AB dummy_input AB dummy IO a dumny output Remove Item s 2 MAMI National Instruments DaqOpc lt w National Instruments LookoutOPCS erver National Instruments OPCD emo National Instruments OPCFieldPoint National Instruments OPCLookoutDrivers Registered Computers Tanks Server Item Properties Server Name Tag Name 0 0 E H F
210. tralia 1800 300 800 Austria 43 0 662 45 79 90 0 Belgium 32 0 2 757 00 20 Brazil 55 11 3262 3599 Canada Calgary 403 274 9391 Canada Ottawa 613 233 5949 Canada Qu bec 450 510 3055 Canada Toronto 905 785 0085 Canada Vancouver 604 685 7530 China 86 21 6555 7838 Czech Republic 420 224 235 774 Denmark 45 45 76 26 00 Finland 385 0 9 725 725 11 France 33 0 1 48 14 24 24 Germany 49 0 89 741 31 30 India 91 80 51190000 Israel 972 0 3 6393737 Italy 39 02 413091 Japan 81 3 5472 2970 Korea 82 02 3451 3400 Malaysia 603 9131 0918 Mexico 01 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 0800 553 322 Norway 47 0 66 90 76 60 Poland 48 22 3390150 Portugal 351 210 311 210 Russia 7 095 783 68 51 Singapore 65 6226 5886 Slovenia 386 3 425 4200 South Africa 27 0 11 805 8197 Spain 34 91 640 0085 Sweden 46 0 8 587 895 00 Switzerland 41 56 200 51 51 Taiwan 886 2 2528 7227 Thailand 662 992 7519 United Kingdom 44 0 1635 523545 For further support information refer to the Additional Information and Resources appendix To comment on the documentation send email to techpubs ni com Contents Student Guid eo e di d A Aka A WZA A dE 5 AINE Cert fi atoms a sA JO r r o Ee a aaa o dwa 6 Bs Course Description i dad dada doda iii delenit 7 C What You Need to Get Started iscsi oai e aeaa Ok ai dz 7 DELSZIIKACANCEZYNA ZOO 8 E Course Goal 8 isa kiki di dn n Wieki bebe Seats din ao dea etude leah ies 8 Fe Course Co
211. ts own ID stored in the ID Tag Caution Data Set Logger is what makes sure that tags configured for data set are logged to the respective data set You must make sure the Data Set Logger gets launched when you start the Tag Engine The most elegant way to ensure the Tag Engine starts the Data Set Logger is to include at least one Data Set Logger item in the SCF file So when the Tag Engine is started the Data Set Logger item included invokes the Data Set Logger to start LabVIEW DSC Module Course Manual 5 4 ni com Logging Data Sets DOOOOOOOOOOOOOOOOOOOOOOOO DOGG 1 Generates unique Run ID and writes it to the ID Tag 2 Writes ON to the control tag This will start the run oooga DOGODOOOOWOOWOOWOWOD Dono Enables Start Test button Test Disabled istop button 7 7 pDisabled GOTO TON On Ono nO non Onn On Ono non on nO no non ono nO nO nnn nnn 3 Generates waveform of Setpoints 4 Writes OFF to the control tag This will end the run SZEF JERSTRUMENTS Logging Data Sets This slide shows how to log data sets using LabVIEW Notice that you do not specify the data set name when logging to a data set Because certain tags are associated with a particular data set writing to the tag automatically logs to the data set Thus you can associate a tag with multiple data sets In such a case when writing data to that tag all the data sets associated als
212. twork configuration you might have a slightly different properties screen that only allows you to specify one password for read only and one for full access You can still enable sharing but you cannot have as much control over which users can access the system National Instruments Corporation 7 19 LabVIEW DSC Module Course Manual Importing Network Tags R Ta ud iguration Editor Temp Chamber scf LabVIEW 1 Edit Tools Configure Servers Window Help cek Sle 2515 a Ele E 1 File lmport lt a Network Tags a a 2 Browse to SCF file of server UW avee eera 2Yome 3 Add All tags Tad Click Import Save SCF file Tag Information Z Import As Input Output Tags Import As BridgeVIEW 2 x compatible Import Importing Network Tags In order to create network tags you must go to the Tag Configuration Editor and create a new SCF file Then select File Import Network Tags Use the Browse button to browse to your SCF file Click Add All to create network tags for all of the tags of the server Click Import to create the selected tags Save the SCF file Do not save over the SCF file of the server Even though you have a file with the same tag names the SCF file of the network client is different from the SCF file of the server LabVIEW DSC Module Course Manual 7 20 ni com Exerci
213. ule Course Manual Compact FieldPoint Terminal Connector Blocks Smart I O are KO SDI Controller o Rugged Metal Backplane Compact FieldPoint modules offer the most rugged platform for embedded control and network distributed measurements All compact FieldPoint modules are built to last including a solid metal back plate steel screw fasteners and flexible wiring and cabling options Because of these rugged features Compact FieldPoint modules are rated to 50 g shock and 5 g vibration as well as an operating range of 25 to 60 C Furthermore they are expandable with removable CompactFlash storage and contain multiple RS 232 RS 485 serial ports LabVIEW DSC Module Course Manual 1 18 ni com FieldPoint Communication EJ R ETHERNET E LabVIEW Real Time 10BaseT 100BaseT SERIAL sngaald NOILVGNNO4 WIRELESS FieldPoint communication options include the following e Serial FP 1000 RS 232 485 and FP 1001 RS 485 e Wireless SRM6000 Spread Spectrum Radio Modem connected to FP 1000 RS 232 Network Module Ethernet FP 20xx for use with LabVIEW RT and FP 16xx 10BaseT or 100BaseTX HI Fieldbus FP 3000 e Wireless Ethernet National Instruments Corporation 1 19 LabVIEW DSC Module Course Manual Demo PID Temperature Controller Preview of Exercise 7 2 Develop an understanding of what can be done with the DSC Module OBJECTIVE Ope
214. ule Course Manual Optional Exercise 6 2 Edit a Large SCF File Objective To create a large SCF file then edit the tag parameters using Excel 1 If the Tag Engine is currently running double click the Tag Engine Icon in the taskbar to display the Engine Manager window In the Engine Manager click the Stop icon to stop the Engine Select Tools DSC Module Configure Tags to open the Tag Configuration Editor Select File New to create a new SCF file and click the OK button Select Edit Configuration Wizard to open the Tag Configuration Wizard Expand the National Instruments OPCLookoutDrivers server Lookout Protocol Drivers and Modbus so that the addresses are visible Select the address range 40001 49999 and click the Add as Range button Change the value in the Create This Many Items field to 1000 and click the OK button Select the address range 1 9999 and click the Add as Range button Change the value in the Create This Many Items field to 1000 and click the OK button Click the OK button to automatically generate the tags It will take a minute or two to process all 2 000 tags In the Tag Configuration Editor select File Save As and save the file as large scf in the C Exercises LabVIEW DSC directory Select File Export enter large txt as the filename to export to and click the OK button to export if Select Tag Fields for Export x Spreadsheet File txt ene m Available Tag Fiel
215. ut an alarm limit The actual alarms available vary depending on the tag type The dialog box in this slide shows the alarm for an analog tag String tags do not support alarms Discrete tags can generate an alarm if the tag is high or if the tag is low Bit arrays allow you to generate an alarm based on the status of multiple bits in the array For analog tags there are four possible alarms HI HI_HI LO and LO_LO It is assumed that LO LO lt LO lt HI lt HI HI The Priority is used only to document how important the alarm is 15 is considered high priority and 1 is considered low priority National Instruments Corporation 4 15 LabVIEW DSC Module Course Manual e Viewing Alarms Using the HMI Wizard 42 Al Controls DSC Mock 4 gt gt ra doj Gz T gt 1 Select DSC Module Alarms and Events Alarm Summary Display Listbox from the Control Palette 2 Apply the HMI Wizard to the indicator and set to use the Alarm Summary 3 Add desired tags and click OK ni com NATIONAL JERSTRUMENTS Using the HMI Wizard to View Alarms To view current alarms or a summary of events place an Alarm Summary Display Listbox indicator on the front panel Right click the indicator and select HMI Wizard Specify which tags to monitor for alarms in the Tags tab You also can set
216. ween true and false at a faster rate This simulates the speed of the actual spinning fan National Instruments Corporation 3 25 LabVIEW DSC Module Course Manual 3 Create the HMI Wizard Code for Light Intensity a Open the front panel Right click the Light Intensity slider and select HMI Wizard from the shortcut menu to open the HMI Wizard Select the appropriate tag from Tag Value pull down menu For Light Intensity select Channel 0 of PWM If the wire connections on the Temperature Chamber are reversed you can select a different channel or change the connections FP 10_0_34_16_FP PWM 520 2_Channel 1 FP 10_0_34_16_FP TC 120 1_Channel 0 fit lt ALL gt Remove the checkmark from the Match control label to tag name checkbox and click the OK button to generate code with the HMI Wizard gt HMI Wizard for Analog Control Data Connection Alarms Tag Value Tag FP 10_0 3416 FP PWM 5z0 l Control Properties C Match control label to tag name Match scale to tag configuration Max 100 00 Min 0 00 Units d Repeat steps a through c For Fan Speed control Select Channel 1 of the FieldPoint PWM 4 Open the block diagram and notice the code created by the HMI Wizard Each control created a Sequence Structure that includes a DataSocket URL to the tag selected in the HMI Wizard In addition to the two Sequence Structures for two input tags a While Loop is created that monitors the Tag Engine
217. y once per second then hardware that samples at a high frequency is not likely necessary 2 Configure your tags Not only can you assign a tag to represent a data channel available on your hardware but you also can configure tags to maximize their effectiveness By properly configuring tags you can do things such as filter out some types of noise automatically change how the Tag Engine updates the values of a tag and other properties as well 3 Customize your VI While the wizards provide you needed functionality for your simpler applications as you grow more comfortable with DSC you might want to modify the code of a wizard and use it as a base for your own to create versatile applications Refer to Lesson 3 Designing Your LabVIEW DSC Application for more information about customizing VIs LabVIEW DSC Module Course Manual 2 2 ni com Choosing the Proper Hardware e Analyze Your Needs Decide what you want to measure and control e Choose Appropriate Sensors and Outputs Determine the sensors and output signals you need Choose the Hardware Select hardware that can measure and output appropriate signals e FieldPoint Compact rugged PACs for distributed data acquisition e Data Acquisition Cards Computer based hardware for data acquisition near PC e PLCs Third party controllers Contact a National Instruments Technical Representative for help INSTRUMENTS N NATIONAL Choosing the Prope
218. y selecting Tools DSC Module Configure Tags In TCE you can open the Historical Logging Configuration dialog box by selecting Configure Historical The Historical data lifespan parameter can be set here National Instruments Corporation 5 11 LabVIEW DSC Module Course Manual gt gt gt Compacting Your Database Compress databases regularly to free extra space and reduce amount of disk space used Use the Compact Database VI located in Functions Palette DSC Module Vis Historical Data Compact Database database URL error in no error error out show status bar T an JF STRUMENTS Compacting Your Database Compact Database VI Use this VI to compact a Citadel database Compacting a database frees extra room in the database that was created by deleted archived or lifespan expired trace data Deleting or archiving traces usually leaves empty disk space that is still taken up by the database Compacting the database eliminates the empty space Compact the database before backing it up or merging databases This is similar to defragmenting the hard drive for your PC LabVIEW DSC Module Course Manual 5 12 ni com Importance of Archiving and Backing Up Data Prevents against complete loss of logged data due to computer problems or corrupted databases e Promotes redundancy to reduce vulnerability of lost data Stores data on a remote hard drive or other storage devices e Ac

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