Operator Workstation User`s Manual: Using Trend
Contents
1. Destination summary the network PC group and system names are also indicated Displays the name of the attribute being trended Displays the display units for the attribute being trended Displays the interval at which the data is sampled Displays the number of trend samples is collected at the NCM 14 4 Operator Workstation User s Manual Trend Data Scales Use the Trend Data window to display the actual trend data in either table or graph form Trend Data Table Figure 14 2 shows an example of Trend Data organized in table form This is the default format 22 Trend Data ltem Edit View Action GoTo Accessory Help Figure 14 2 Trend Data Window in Table Form Each column in the table corresponds to one of the attributes listed at the top of the window and is labeled with the appropriate ID A to G The columns display the values for the attribute at the various time samples When data is unavailable at sampling the value field appears blank When data is unreliable for example if the NCM goes offline column on the far left displays the time and date of the sample The trend samples appear in chronological order with the most current samples at the top Operator Workstation User s Manual 14 5 Trend Data Graph The graph displays each item based on one of three scales Common Individual or User Defined Common is the default You ll find out how to change the type of scale later in this section The scale2. minutes C 5 minutes C 60 minutes C10 minutes C120 minutes Figure 14 4 Add Trend Dialog Box 3 Fill in the fields Refer to Table Table 14 4 Add Trend Parameters Field Description Attribute Displays the name of the selected attribute Number of Samples Displays the number of samples selected for the attribute 17t Display Units Displays the number of units for the 1 display attribute gne Display Units Displays the number of units for the 2n display attribute Sample Interval Displays the time between the sample interval 4 Click OK 14 10 Operator Workstation User s Manual Beginning Trend To begin trend data collection for selected attributes 1 Select one or more attributes in the Trend Item window 2 On the Action menu click Begin Trend Ending Trend To end trend data collection for selected attributes 1 Select one or more attributes in the Trend Item window 2 On the Action menu click End Trend IMPORTANT Trends restart when the NCM is downloaded even if you have marked the individual object trend as Ended Modifying a Trend Entry To modify trend entry 1 Select an attribute 2 On the Action menu click the Modify Trend Entry The Add Trend dialog box for the selected attribute appears Figure 14 4 Modify the Display units and Sample Time Interval 4 Click OK Clearing a Trend Entry To clear an entry from the Trend database 1 Select the attribute or attributes you want to c
3. Chapter 14 Operator Workstation User s Manual 14 1 Using Trend Introduction The trend data is collected by the NCM and displayed in a graph or table at the OWS This chapter describes how to display the trend item window add a trend entry begin trend end trend modify a trend entry clear a trend entry display a trend data window scale trend data refresh trend data activate fast trend archive trend data clear archived trend data August 1 2001 Johnson Controls Inc www johnsoncontrols com Code No LIT 120178 14 2 Operator Workstation User s Manual Key Concepts Trend The Trend feature differs from the Point History feature in that Point History data collection has a fixed attribute list fixed sample period and fixed number of samples In contrast the Trend feature allows operators to specify the attributes to be trended the sample interval and the number of samples The Trend feature monitors changes in object attribute values over time The Trend feature answers questions like the following How constant is the temperature in a certain area of the building How often does the temperature get close to the warning limit The Trend feature can be accessed from any window displaying objects or from a Reports Destination summary The options are described below Trend Accessed from a Window Displaying Objects When accessed from a Network Map an Object Focus window or a summary displaying obj
4. K Note Because the most recent request overrides all previous requests Fast Trend collection stops for any other PID Loop object from the same DCM Stopping Fast Trend To stop Fast Trend collection on the Action menu click Stop Fast Trend Fast Trending stops for the PID Loop object Archiving Trend Data To archive trend data 1 Go to the Network Map 2 Click on the NCM containing the archive data you want to archive 3 On the Action menu click Archive Data A dialog box appears asking you to confirm the archive for the NC 4 Click OK Note The archive process may fail if there is not enough memory to create a Trend report 14 14 Operator Workstation User s Manual Clearing Archived Trend Data Clearing Selected Reports To clear selected reports 1 Select the trend report you want to clear The selected report appears highlighted 2 On the Action menu click Clear Trend Entry A dialog box appears asking you to confirm the deletion 3 Click OK Purging the File To purge all data from a PC file 1 Click the Reports Destination summary The summary appears 2 Select Trend 3 Click Purge File A dialog box appears asking you to confirm the deletion 4 Click Purge All of the reports in the file are deleted
5. ects the Trend feature displays online data for up to seven objects The trend data is collected by the NCM and stored in an NCM buffer Trend Accessed from a Reports Destination Summary When accessed from a Reports Destination summary a summary of reports sent to a PC file the Trend feature displays archived data for objects that have trend data sent to the PC file Operator Workstation User s Manual 14 3 Trend Item Window Use the Trend Item window Figure 14 1 to access the Data window and set up trend Trend Item 5_CLG Iof x ltem Edit View Action GoTo Accessory Help JCHDQTRS Johnson Controls Hdqtrs Se GRP NC25 STANDARD Object Grp NC25 GOV_HSE Bldg 5 Clg Equipment IP Object Group Chilled Water System Status Tiem Attribute Display Units No Trend DCM 1 Began DCM 9 SCAN Began CHP6 S TROUBLE ATIDCM1 SUB_SLOT No Trend AO1DCM1 No Trend ARDCM1 4 LA Field Status Item Attribute Display Units Sample Interval Total NC Samples Figure 14 1 Trend Item Window Table 14 1 details the information found in the Trend Item window When accessed from a Reports Destination summary Status and Total NC Samples fields do not appear Table 14 1 Fields in the Trend Item Window Description Displays the status of trend collection for the attribute No Trend Began End Displays the name of the object whose attributes are being trended If accessed from a Reports
6. escription Displays the name of the attribute being trended Displays the date and time of the sample Displays the value of the attribute at the time sample indicated by the current graph cursor position When you move the graph cursor to another time sample position the value in this field updates If the graph cursor is moved to a time sample when the data is unreliable this field Displays the minimum displayed value Lesser values appear as the minimum value Displays the maximum displayed value Greater values appear as the maximum value Default Fast Trend Settings When operators first activate a Fast Trend graph it uses a default setup The default period length is six seconds meaning that the attributes are sampled every six seconds Table 14 3 shows the default Fast Trend setup Table 14 3 Default Fast Trend Attributes Attribute Display Low Display High Setpoint 30 0 80 0 Output 0 0 100 0 Feedback 30 0 80 0 Archiving Trend Data Operators can archive any current trend data for all of the objects on an NC This prevents any data not yet archived from being lost during an NCM download When you initiate the archive both trend and totalization data for the NC are archived Clearing archived trend data deletes it from the Reports Destination summary PC file This option is only available in a Trend Item window accessed from a Reports Destination summary 14 8 Operator Workstation User s Manual Detailed P
7. h is displayed at the top of the Focus window 14 12 Operator Workstation User s Manual Changing Fast Trend Setup To change the Fast Trend setup 1 Go to the Focus window of the PID Loop object that contains the Fast Trend information you want to display 2 On the Action menu click Start Modify Fast Trend option The Fast Trend Setup dialog box appears Figure 14 6 FAST TREND SETUP PID Loop Period secs Attribute 1 Name SETPOINT Min displayed value 80 000 Max displayed value Attribute 2 Name YVALUE Min displayed value 0 000 Max displayed value 100 000 l Select default attributes Attribute 3 Cancel Name FEEDBACK Min displayed value iE 80 000 Max displayed value Attribute 4 Min displayed value Max displayed value il Figure 14 6 Fast Trend Setup Dialog Box 3 Modify the fields Refer to Table 14 5 Table 14 5 Fast Trend Field Period secs Name Min displayed value Max displayed value Description 4 Click OK Specifies the interval between Fast Trend samples 1 to 32 767 seconds Displays the name of the attribute Displays the minimum value for the attribute Displays the maximum value for the attribute Operator Workstation User s Manual 14 13 Restarting Fast Trend To restart Fast Trend collection 1 On the Action menu click Start Modify Fast Trend The Fast Trend Setup dialog box appears 2 Click O
8. lear 2 On the Action menu click Clear Trend Entry A dialog box appears asking you to confirm the deletion 3 Click OK Displaying the Trend Data Window To display the Trend Data window 1 Display the Trend Item window 2 Select up to seven attributes to display in the Trend Data window 3 On the Action menu click Trend Data The Trend Data window appears Figure 14 2 Scaling Trend Data Operator Workstation User s Manual 14 11 To change the Trend scale l 4 5 Select an object to trend and display the Trend Data window The Trend Data window appears in table form On the View menu click Show as Drawing The Trend Data windows display data in graphical form On the Action menu click Change Scale The Change Scale dialog box appears Figure 14 5 Trend Data Change Scaling Method C Individual C User Defined System Object Attribute Minimum Maximum VMA AIT AI 26 VALUE Cancel Figure 14 5 Change Scale Dialog Box Modify the fields Click OK The Trend Data window appears in the selected scale Activating Fast Trend To activate Fast Trend l Go to any window displaying the PID Loop object whose Fast Trend information you want to view For example go to a System summary displaying the object Click the object The PID Loop Object Focus window appears On the Action menu click Start Modify Fast Trend The Fast Trend Setup dialog box appears Click OK The Fast Trend grap
9. objects When Fast Trend is activated a Fast Trend graph appears at the top of a PID Loop Object Focus window This graph displays dynamic Fast Trend information for up to four selected attributes The buffer in the NCM can hold up to 180 Fast Trend samples When the buffer is full old samples are removed to make room for new samples Fast Trending takes place only while the PID Loop Object Focus window is open When you close the window the buffer is cleared In addition whenever you change any of the Fast Trend setup parameters the buffer is cleared and trending starts over 14 6 Operator Workstation User s Manual Only one PID Loop object from each DCM can display Fast Trend information at one time When more than one request is made for Fast Trend information from the same DCM the most recent request overrides the previous request Figure 14 3 shows an example of a Fast Trend graph iojxi Item Edit Yiew Action GoTo Accessory Help E Johnson Controls Hdgtrs STANDARD Object Grp NC44 Ground Floor System PID Loop 1 FastTrend Value Display Low Figure 14 3 Fast Trend Graph in PID Focus Window When data is unreliable gaps appear in the attribute lines Table 14 2 describes the trend data information that appears at the top of the Fast Trend graph Operator Workstation User s Manual 14 7 Table 14 2 Fast Trend Graph Fields Field Attribute Date and Time Value Display Low Display High D
10. rocedures Displaying the Trend Item Window Displaying the Trend Item Window from the Network Map To display the Trend Item window from the Network Map 1 Click a system on the map 2 On the Go To menu click Trend The Trend Item window appears Figure 14 1 Displaying the Trend Item Window from a Window Displaying Objects To display the Trend Item Window from a window displaying objects 1 Display the summary or Focus window Note Ifyou are using an Object Focus window skip step 2 2 Select the system name in the stair step directory or select an object 3 On the Go To menu click Trend The Trend Item window appears Figure 14 1 Displaying the Trend Item Window from a Reports Destination Summary To display the Trend Item window from a Reports Destination summary 1 Click the PC file that contains the desired Trend report The Reports Destination summary for the selected PC file appears 2 Click Trend The Trend Item window appears Figure 14 1 Operator Workstation User s Manual 14 9 Adding a Trend Entry To add and define trend collection for an object attribute 1 Select an object in the Trend Item window 2 On the Action menu click Add Trend Entry The Add Trend dialog box appears Figure 14 4 Trend Item Add Trend Entry Attribute URE Number of samples Cancel 1st Display units 2nd Display units il Sample Interval C1 minute 15 minutes 2 minutes C 30
11. values are displayed on the Y axis Each line in a graph corresponds to one of the trended attributes listed at the top of the window and is labeled with the appropriate ID A to G If data is unavailable gaps appear in the line The time is displayed at the bottom of the chart with the most current samples on the far right The values displayed in the Value field at the top of the window reflect the current position of the graph cursor Scaling Trend Data Fast Trend Operators can scale Trend data using one of three scales Common Individual or User Defined Common is the default Common scale is the only scale that displays values on the Y axis With the Common scale the high and low values are based on the overall high value and overall low value for all of the objects being trended The middle value displayed on the Common scale graph is the mid range between the highest and lowest value that any of the objects have reached Individual scale determines the highest and lowest values for each attribute being trended The highest value on the graph will be the same for all objects even if the high values of each object is different User Defined scale is like Individual except it has a user defined high and low value for each of the objects being trended rather than using the actual high and low values each object has reached The Fast Trend feature provides the higher sample rate required to check the response of PID Loop
Download Pdf Manuals
Related Search