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1794-UM010B-EN-P

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1. Individual t Digital Input VHSC Digital Input Digital Output Module Module Module Module 6000000000000000 _ 0000000000000000 0000000000000000 0000000000000000 palpo550000000000000 100600000000000000 f0000000000000000 f0000000000000000 1 0000000000000000 66000000000000000100000000000000001k00000000000000 0 ES ES E3 E 24V dc 24V dc Note Use this configuration if using any digital output 24V dc modules that could couple transients to the 24V supply VHSC Module wiring separate from digital wiring Wiring when total current draw is greater than 10A Publication 1794 UM010B EN P March 2001 2 4 How to Install Your Very High Speed Counter Module Installing the Module Installation of the very high speed counter module consists of mounting the terminal base unit installing the VHSC module into the terminal base unit installing the connecting wiring to the terminal base unit If you are installing your module into a terminal base unit that is already installed proceed to Mounting the High Speed Counter Module on the Terminal Base on page2 8 Mounting the Terminal Base Unit on a DIN Rail ATTENTION Do not remove or replace a terminal base unit when power is applied Interruption of the flexbus can result in unintended operation or machine motion 1 Remove the cover plug if used in the male connecto
2. Application of New Configurations WO SITUGDIFG SRE eth RARES RE Cice Pbi cesse Fg Adapter Input Status Word Sale Slate Dala x s rr RILIxlReb Reim 43x eis Device Actions Communication Fault Behavior Idle State BRAVO et erbe Pee Mew ima Input Data Behavior upon Module Removal Frequency Resolution Enhancement Applying the Frequency Resolution Enhancement High Speed Counter Module 1794 VHSC Image Table Mapping Chapter 5 What This Chapter Contains Status Indicators nei ey eer ceto e PR Diagnostic Codes Returned by the Module Diagnostics Reported in Word 8 of the Data Input File Whats Next Appendix A Specifications 24V Input Derating Curve Appendix B CSA Hazardous Location Approval Chapter 1 Overview of the Very High Speed Counter Module Chapter Objectives This chapter gives you information on features of the 1794 VHSC module how the module communicates with programmable controllers how the module operates Module Description The VHSC module performs high speed counting for industrial applications The module is an intelligent I O module that interfaces signals with any Allen Bradley programmable controller that has
3. 4 1 4444 2 2 Power Requirements 2 eee ERI ROC EE ees 2 2 Wiring the Terminal Base Units 1794 TB3G shown 2 3 Installing the Module 5284888 eet ex RERO Y Rn 2 4 Mounting the Terminal Base Unit on a DIN Rail 2 4 Panel Wall Mounting 2 6 Mounting the High Speed Counter Module on the Terminal Base Unit eium er Re teen 2 8 Connecting Wiring for the High Speed Counter Module 2 9 Wiring connections for the 1794 VHSC High Speed Counter Module vas Ane tence too estem et s 2 12 Example of Quadrature Encoder Differential Wiring to a 1794 TB3G Terminal Base Unit nct 2 13 Module Indicators 223 ever rer et WE en RT ERES 2 14 Chapter Summary i cua otto deerit eoe Er get d 2 15 Publication 1794 UM010B EN P March 2001 ii Table of Contents Programming Your Very High Speed Counter Module Input Output and Configuration Files for the Very High Speed Counter on ControlNet Troubleshoot the Very High Speed Counter Module Specifications CSA Hazardous Location Approval Publication 1794 UM010B EN P March 2001 Chapter 3 Le MT Ez NR ohna a EE EET Chapter 4 Chapter Objectives o n ler RE ERER ER ts About the ControlNet Adapter Communication Over the FLEX 1 0 Backplane Scheduled Data Transfer Unscheduled Data Transfer Module I O Mapping
4. Output 2 Output enable bit OE When set to 1 output can be turned on 09 11 from a force on compare match or as directed by the PWM settings When OE 0 the associated output is turned off Output 2 Local control bit LC When set to 1 output is controlled the counter if the flexbus power is lost i e the module detects a flexbus reset signal Note When flexbus power is lost communication to the PC is lost When LC 0 the module clears its OE bit at a loss of flexbus power Set this bit as appropriate in the safe state word since a communication fault occurs after adapter power is lost 10 12 Word 1 continued 11 13 Not used set to 0 Output 3 Force output bit FO When set to 1 output is turned on if OE is 12 14 1 When FO 0 output can be controlled by a compare match or as directed by the PWM settings Output 3 Output enable bit OE When set to 1 output can be turned on 13 15 from a force on compare match or as directed by the PWM settings When OE 0 the associated output is turned off Output 3 Local control bit LC When set to 1 output is controlled the counter if the flexbus power is lost i e the module detects a flexbus reset signal Note When flexbus power is lost communication to the PC is lost When LC 0 the module clears its OE bit at a loss of flexbus power Set this bit as appropriate in the safe state word since a communication fault occurs after adapter power is
5. 3 The module converts these signals into binary format and stores these values and controls their output until the adapter requests their transfer Publication 1794 UM010B EN P March 2001 1 16 Overview of the Very High Speed Counter Module 4 The adapter transfers the data over the flexbus 5 The adapter and module determine that the transfer was made without error and inputs values are within a specified range 6 ControlNet transfers the data to the PLC data table Chapter Summary In this chapter you learned how your module operates and how your module communicates with the programmable controller Publication 1794 UM010B EN P March 2001 What This Chapter Contains Before You Install Your Input Module European Union Directive Compliance Chapter 2 How to Install Your Very High Speed Counter Module In this chapter we tell you For information on See page Before You Install Your Module 2 1 European Union Directives 2 1 Power Requirements 2 2 Installing the Module 2 4 on a DIN rail 2 4 on a wall panel 2 6 on the terminal base 2 8 Connecting Wiring 2 9 Module Indicators 2 14 Before installing your 1794 VHSC very high speed counter module You need to As described under Calculate the power requirements of
6. encoder mode direction of count 1 4 operation 1 3 encoder X4 1 3 Index F frequency input module how it works 1 15 G gate reset input 1 6 I O ControlNet unscheduled non discrete 1 0 data transfer 4 2 unscheduled operations messaging from programming devices non discrete I O data transfer 4 2 peer to peer messaging 4 2 indicators states 2 14 status 2 14 troubleshooting 5 1 input mapping 4 6 input status word 4 3 installation module 2 8 of the module 2 4 K keyswitch positions 2 8 L ladder rung messaging 4 2 low voltage directive 2 2 mapping 1794 VHSC 4 6 explanation 4 2 Message instructions 4 2 module description 1 1 module features 1 1 module installation 2 4 2 8 mounting on terminal base 2 8 Publication 1794 UM010B EN P March 2001 1 2 Index PublicatiOon 1794 UM010B EN P March 2001 mounting kit cat no 1794 NM1 2 6 MSGs See Message instructions 0 outputs assigning to counters 1 13 enabling and forcing 1 13 isolation 1 14 operation of 1 13 tying to counters 1 15 P panel wall mounting 2 6 period rate mode operation 1 8 polled I O structure 4 3 R rate measurement connection to counter inputs 1 13 rate measurement mode 1 12 removing and replacing under power RIUP 2 9 rollover value 1 6 S sample period 1 12 scaler operation 1 10 scaling input 1 6 software reset 1 6 specifications A 1 s
7. Publication 1794 UM010B EN P March 2001 Chapter 3 Programming Your Very High Speed Counter Module To initiate communication between the very high speed counter module and your PLC processor you must use RSLogix 5 software Refer to the RSLogix software manuals for information on communicating with this 1794 VHSC very high speed counter module Publication 1794 UM010B EN P March 2001 3 2 Programming Your Very High Speed Counter Module Publication 1794 UM010B EN P March 2001 Chapter Objectives About the ControlNet Adapter Communication Over the FLEX 1 0 Backplane a ControlNet Network Adapter Chapter 4 Input Output and Configuration Files for the Very High Speed Counter on ControlNet In this chapter you will learn about ControlNet Adapter e T O structure safe state data communication fault data idle state behavior input data behavior upon module removal This module must be used with the FLEX I O ControlNet adapters cat no 1794 ACNI5 series B and ACNRI series B or later which support extended data transfer EDT These adapters interface up to 8 FLEX I O modules and a ControlNet processor or scanner The adapter can support ControlNet real time data connections to individual modules or module groups Each connection is independent of the others and can be from different processors or scanners One 1794 ACN15 B and ACNR15 B ControlNet adapter can interface up to eight term
8. uw Allen Bradley Very High Speed Counter User Module Manual Cat No 1794 VHSC Important User Information Because of the variety of uses for the products described in this publication those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements including any applicable laws regulations codes and standards The illustrations charts sample programs and layout examples shown in this guide are intended solely for example Since there are many variables and requirements associated with any particular installation Allen Bradley does not assume responsibility or liability to include intellectual property liability for actual use based upon the examples shown in this publication Allen Bradley publication SGI 1 1 Safety Guidelines For The Application Installation and Maintenance of Solid State Control available from your local Allen Bradley office describes some important differences between solid state equipment and electromechanical devices which should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted publication in whole or in part without written permission of Allen Bradley Company Inc is prohibited Throughout this manual we make notes t
9. 9 and 13 refer to chapter 4 Once the outputs have been enabled they may be forced on by setting bits 0 4 8 or 12 in word 1 The outputs can be forced off by setting the enable bit to 0 Assigning Outputs to Counter Windows By setting bits in the configuration block you can assign the outputs on the module to any of the various counter windows You can assign any output to any count window with no restrictions Publication 1794 UM010B EN P March 2001 1 14 Overview of the Very High Speed Counter Module Operation of Outputs When the outputs for the VHSC module are enabled and assigned to a counter window they operate in an ON OFF fashion For example assume that the module were programmed to turn ON an output when a count value of 2000 was reached Further assume that the user desired to have the output remain energized for a period of 3000 counts and then turn OFF The end result would be that the outputs would turn ON at count of 2000 would remain energized for 3000 additional counts and would turn OFF at 5000 counts The ON and OFF values are circular around zero Refer to figure 1 10 Figure 1 10 On Off Operation of Output Output remains energized for 3000 additional counts BN Output turns on at count value of 2000 sa Output turns off at count value of 5000 10686 I Refer to figure 1 11 Using output 0 as an example when the value in Counter ON Value is less than the value in Counter OFF Value the output t
10. Measurement Mode user specified time interval At the end of the interval the module returns a value representing the sampled number of pulses and a value indicating the incoming frequency When the count and frequency are updated any associated outputs are checked against their associated presets The value representing the total number of pulses is returned in input file words 4 LSW and 5 MSW for channel 0 and 6 LSW and 7 MSW for channel 1 and the value indicating the incoming frequency is returned in words 0 LSW and 1 MSW and 2 LSW and 3 MSW The total count equals the running sum of the number of pulses received during the sample period The operation of rate measurement mode is shown below in Figure 1 9 Figure 1 9 Operation of the Rate Measurement Mode A Input B not used Input Z Encoder Pulse Generator Gate Reset p Time base 1794 VHSC A Input pulse Internal Sampling oe 6 0 tf fo 11 2 3 Accumulated Count Frequency calculated outputs updated here If sample period is 50ms and count 3 then frequency 3 50ms 60Hz Example In figure 1 9 three counts have been accumulated during the user selected time period If you had selected 50 milliseconds as the sample period the frequency returned to the programmable controller processor would be Frequency Counts Sample period 3 counts 50 milliseconds 60Hz Publication 1794 UM010B EN P March 2001 Pulse Width Modu
11. Output and Configuration Files for the Very High Speed Counter on ControlNet 4 5 Communication Fault Behavior You can configure the VHSC response to a communication fault Upon detection of a communication fault the module can leave the module output data in its last state hold last state reset the module output data to zero reset apply safe state data to the module output Idle State Behavior The VHSC module responds to idle state PLC in PROGRAM mode according to the Communication Fault Behavior described above The module can leave the module output data in its last state hold last state reset the module output data to zero reset apply safe state data to the module output Input Data Behavior upon Module Removal I O module input data sent by the adapter upon module removal is configurable The adapter can reset the module output data to zero reset leave the module output data in the last state before module removal hold last state Frequency Resolution Enhancement This mode is only for use in modules with firmware revision D or later The upper byte of the counter control word output word 0 is reserved for special modes Only mode 8 Enhancing Frequency Resolution is available In this mode you can change significant digits of frequency display based on output word 3 for channel 0 and output word 4 for channel 1 Decimal point placement is absolute positioning 2 moves decimal point
12. 2 counters has one preset value associated with it In the encoder or counter modes the preset value represents a reference point or count from which the module begins counting The module can count either up or down from the preset value Preset values are loaded into the count registers through the preset count bits Preset values can range from 0 to 16 777 215 binary Rollover Value Each of the 2 counters has one rollover value associated with it When the rollover value is reached by the encoder counter it resets to 0 and begins counting again The rollover values range from 1 to 16 777 216 binary The rollover value is circular for example if you program 360 the count will be from 358 359 0 1 etc ina positive direction and from 1 0 359 358 etc in a negative direction Software Reset The counters can also be reset by the Reset Count bits found in Word 0 bits 0 and 4 of the Counter Control word When one of these bits is set to 1 the associated counter is reset to zero and begins counting The module can also be reset with the gate reset as explained below Refer to chapter 4 for further details Gate Reset Input There is one gate reset input for each of the 2 counters The gate reset input when active will function in one of the 4 store count modes outlined below Scaling Input Count at the Gate Reset Terminal You can scale the incoming count at the gate reset terminal Scaling allows the incoming pulses at gat
13. Li VEIL TE Do faces 2 Make certain the flexbus connector 3 is pushed all the way to the left to connect with the neighboring terminal base adapter You cannot install the module unless the connector is fully extended 3 Make sure that the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base unit ATTENTION Remove field side power before removing or inserting the module This module is designed so you can remove and insert it under backplane power When you remove or insert a module with field side power applied an electrical arc may occur An electrical arc can cause personal injury or property damage by sending an erroneous signal to your system s field devices causing unintended machine motion causing an explosion in a hazardous environment Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector Worn contacts may create electrical resistance Publication 1794 UM010B EN P March 2001 Connecting Wiring for the High Speed Counter Module 1794 TB3G 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 15 Label placed at top of wiring area 34 and 50 24V dc 35 and 51 common 16 and 33 chassis ground 40 thru 45 chassis ground How to Install Your Very High Speed Counter Module 2 9 Position the module 4 with its alignment bar 5 aligned with the groove 6 on the terminal base
14. Output 5V dc terminations 0 5A pair 12 24V dc terminations 1 0A Short Circuit Current 5V dc terminations 0 9A 12 24V dc terminations 4 0A Outputs are short circuit protected and turn off until power is cycled Delay Time OfftoOn 25us load dependent On to Off 150us load dependent Isolation Voltage 100 tested 850V dc for 1s between six isolated areas including flexbus module 24V dc power A0 B0 Z0 inputs A1 B1 Z1 inputs 00 01 and output power supply 1 O2 03 and output power supply 2 Flexbus Current 75mA 9 5V dc with terminal base power off Power Dissipation 5W maximum 9 31 2V dc Thermal Dissipation Maximum 17 1 BTU hr 9 31 2V dc Indicators 1 green red power status indicator 6 yellow input status indicators logic side 4 yellow output status logic side Keyswitch Position 1 Specifications continued on the next page Specifications A 3 Specifications 1794 VHSC Very High Speed Counter Module General Specifications Module Location Dimensions Inches Millimeters External dc Power Supply Voltage Voltage Range Supply Current Environmental Conditions Operational Temperature Storage Temperature Relative Humidity Shock Operating Nonoperating Vibration Conductors Wire Size Category Agency Certification when product is marked User Manual Installation Instructions Cat No 1794 TB3G or TB3GS Terminal Base 1 8H x 3 7W x 2 1D 45 7 x 94 0 x 53 3 Refer to 24V Derating Cu
15. Press firmly and evenly to seat the module in the terminal base unit The module is seated when the latching mechanism 7 is locked into the module Repeat the above steps to install the next module in its terminal base unit Wiring to the high speed counter module is made through the terminal base unit on which the module mounts Compatible terminal base units are Module 1794 TB3G 1794 TB3GS 1794 VHSC Yes Yes 1794 TB3GS 0 1 2 3 4 5 6 7 8 910 11 12 13 14 15 161718 1920 21 22 2324 25 26 27 28 2930 313233 3435 36 37 38 39 40 41 42 43 44 4546 47 48 49 5051 AARARARARAAAAARAAR 16 33 cOnaonononoanoonanono ECCEEEDEELZLEULCEEENO 34 51 BAAAAAAR AAA AAAAAASA 34 and 50 24V dc 35 and 51 common 16 and 33 chassis ground 40 thru 45 chassis ground Connecting Wiring using a 1794 TB3G and TB3GS Terminal Base Units 1 Connect the individual signal wiring to numbered terminals on the 0 15 row A for 24V inputs terminals 0 5 and 8 13 and 17 32 row B for 5V inputs terminals 17 22 and 25 30 on the terminal base unit Connect the input devices as shown in the wiring table on page 2 12 ATTENTION Do not connect 24V signals to the 5V input terminals Per
16. Read Data file The stored count remains in the Read Data file until it is overwritten with new data Figure 1 6 Store Reset Start Rising Edge Falling Edge Store Count reset to zero LT start counting 10683 Figures 1 3 through 1 6 show the store count feature operating on the rising edge of the gate reset pulse The user has the option of selecting these same features using the falling edge of the gate reset pulse The gate invert bit is active in the store count continuous rate and period rate modes Use the period rate mode to determine the frequency of input pulses by counting the number of internal 5MHz clock pulses over a user specified number of input signal pulses At the end of the specified number of pulses the module returns the frequency and the total number of pulses received A channel configured for period rate mode acts as a period rate counter An internal 5MHz clock is used as a frequency reference This clock is gated by the incoming pulse train at the gate reset input The results of this gating action are the number of pulses or a frequency The frequency is returned in input file words 0 LSW and 1 MSW for channel 0 and word 2 LSW and 3 MSW for channel 1 The total pulses received is stored in input file words 4 LSW and 5 MSW for channel 0 and words 6 LSW and 7 MSW for channel 1 Select the period rate mode by setting the appropriate bits in word 0 of the configuration block 1794 VHSC modul
17. all modules in this FLEX system Power Requirements page 2 2 Position the keyswitch on the terminal base Installing the Module page 2 4 If this product has the CE mark it is approved for installation within the European Union and EEA regions It has been designed and tested to meet the following directives EMC Directive This product is tested to meet Council Directive 89 336 EEC Electromagnetic Compatibility EMC and the following standards in whole or in part documented in a technical construction file EN 50081 2EMC Generic Emission Standard Part 2 Industrial Environment e EN 50082 2EMC Generic Immunity Standard Part 2 Industrial Environment This product is intended for use in an industrial environment Publication 1794 UM010B EN P March 2001 2 2 How to Install Your Very High Speed Counter Module Power Requirements Publication 1794 UM010B EN P March 2001 Low Voltage Directive This product is tested to meet Council Directive 73 23 EEC Low Voltage by applying the safety requirements of EN 61131 2 Programmable Controllers Part 2 Equipment Requirements and Tests For specific information required by EN 61131 2 see the appropriate sections in this publication as well as the following Allen Bradley publications Industrial Automation Wiring and Grounding Guidelines For Noise Immunity publication 1770 4 1 Automation Systems Catalog publication B111 This equipment is class
18. and Al B1 Z1 02 03 at a frequency of 488Hz If inputs or outputs change at or near that frequency the associated indicator will vary in brightness Indicator Indication Explanation A Input A active ot 0 Input A not active B Input B active ot 0 Input B not active Z Input Z active Of Input Z not active OUT 0 1 2 3 Output is on CE Individual output is off Publication 1794 UM010B EN P March 2001 5 2 Troubleshoot the Very High Speed Counter Module Indicator Indication Explanation OK Red solid Hardware diagnostic error TF set to 1 and module channel status contains error code Hardware runtime failure i e watchdog timeout module communication ceases Red flashing Module is configuring hardware NR is set to 1 Module in test mode bits 15 8 of counter control word are non zero TF set to 1 Red flashing Module 24V power is below minimum rating with occasional flashing Green Green solid Module is active and operating normally Green flashing Module is not configured Programming error PE is set to 1 and error code is supplied in bits 11 0 of module channel sttus word Field power fault FP setto 1 Adapter powered down and module local power still active e ControlNet cable disconnected PLC in PROG mode When an input indicator yellow is lighted it indicates that a valid signal active high or active low is present at one of the In
19. be as long as 6 7s 16 777 215 counts X 1 5MHz X 2 half cycles of Z In rate measurement pulses on Z are counted over a sample interval specified by the product of time base X gate interval The time to detect a zero frequency is determined by the sample interval example time base 0 100s gate interval 3 is 300ms to determine ZF Stored data count bit CO C1 for Channel 0 This count cycles thru 00 01 10 11 00 Each time the stored accumulated count words are updated C 0 1 is incremented The PLC sample rate including network delay and program scan must be as fast or faster than the frequency of the event which updates Zero input status bit ZS for Channel 1 This bit represents the present status of the Z input 0 Off 1 Input on Zero frequency detected bit ZF for Channel 1 Only used during frequency configurations period rate continuous rate and rate measurement In period rate and continuous rate counts are acquired during on state of the Z input At very low frequencies the counter saturates indicating a zero frequency detect The time it takes to determine a zero frequency in these 2 configurations can be as long as 6 7s 16 777 215 counts X 1 5MHz X 2 half cycles of Z In rate measurement pulses on Z are counted over a sample interval specified by the product of time base X gate interval The time to detect a zero frequency is determined by the sample interval example time base 0 100s gate int
20. channel A for a bidirectional count Channel B determines direction B low floating the count direction is up B high the count direction is down Encoder X4 mode quadrature input signals count on the leading edge and the trailing edge of channel A and channel B for a bidirectional count Channel B determines direction B low floating the count direction is up B high the count direction is down Overview of the Very High Speed Counter Module 1 5 Direction of Count The module can count either up or down depending upon the condition of the B input for each counter In encoder applications the counter will increment on the leading edge of input A while input B determines the direction of the count You also have the option of X1 X2 and X4 multiplying of the input pulses Figure 1 2 shows the relationships between inputs A and B for forward and reverse directions in encoder applications Figure 1 2 Phase Relationship for Forward or Reverse Directions High Speed Counter Module Quadrature Encoder 1794 VHSC CCW Encoder Rotation CW Encoder Rotation Forward Rotation Reverse Rotation A Input 6 17 48 4 9 dO At 12 12 d H0 9 8 17 6 15 4 3 2 1 X4 Count 10679 I The following paragraphs apply to both encoders and counters Publication 1794 UM010B EN P March 2001 1 6 Overview of the Very High Speed Counter Module Publication 1794 UM010B EN P March 2001 Preset Value Each of the
21. count is available in the Read Data file The stored count remains in the Read Data file until it is overwritten with new data Figure 1 4 Store Wait Resume Stop counting Resume counting Store Count P Pod 10681 I In mode 3 store reset wait start figure 1 5 the rising edge of the pulse on input Z gate reset terminal causes the counter to stop counting store the current count value in the Read Data file and reset the count to zero The counter does not count while the Z input on the gate reset terminal remains high Counting resumes from zero on the falling edge of the pulse at the Z gate reset terminal The stored count is available in the Read Data file The stored count remains in the Read Data file until it is overwritten with new data Figure 1 5 Store Reset Wait Start Counter has stopped counting Start counting from zero Stop count store and reset to zero 10682 1 Publication 1794 UM010B EN P March 2001 1 8 Overview of the Very High Speed Counter Module Store Count reset to zero start counting Operation in Period Rate Mode Publication 1794 UM010B EN P March 2001 In mode 4 store reset start figure 1 6 on the rising edge of a pulse input at the Z gate reset terminal causes the counter to store the accumulated count value in the Read Data file and reset the counter to zero The counter continues counting while the Z gate reset input is high The stored count is available in the
22. input o Z Fmins frequency at which the 24 bit counter overflows 0 149Hz Fmins frequency at which the 24 bit counter overflows 0 298Hz Word 14 Fmins frequency at which the 24 bit counter overflows 0 596Hz Fmins frequency at which the 24 bit counter overflows 1 192Hz w ZH6 Fmins frequency at which the 24 bit counter overflows 2 384Hz Z 32 Fmins frequency at which the 24 bit counter overflows 4 768Hz Z 64 Fmins frequency at which the 24 bit counter overflows 9 537Hz Z 128 Fmins frequency at which the 24 bit counter overflows 19 073Hz Channel 1 Scaler This word scales the Z signal in period rate and continuous rate modes If the filter is applied the filtered Z signal is scaled Set only 1 bit of the Scaler Bits 00 15 Selecting a Scaler causes accumulated counts to be adjusted accordingly i e selecting a 00 17 Scaler of 128 increases the accumulated count by 128 after 128 Z pulses have been received We recommend using the filter to reduce erroneous frequency readings any time you use the Scaler on the Z input w faz Fmins frequency at which the 24 bit counter overflows 0 149Hz 01 Z 2 Fmins frequency at which the 24 bit counter overflows 0 298Hz Z 4 Fmins frequency at which the 24 bit counter overflows 0 596Hz Z 8 Fmins frequency at which the 24 bit counter overflows 1 192Hz w ZH6 Fmins frequency at which the 24 bit counter overflows 2 384Hz Z 32 Fm
23. left 2 places dividing the frequency value by 100 1 moves the decimal point 1 place multiplying by 10 and so on This allows frequency values to fit in a single word Publication 1794 UM010B EN P March 2001 4 6 Input Output and Configuration Files for the Very High Speed Counter on ControlNet Applying the Frequency Resolution Enhancement To use this mode proceed as follows ATTENTION Use this enhancement mode with caution since no checks are performed to verify data Unintended operation can occur 1 Power up the FLEX chassis or put the PLC into RUN mode or both Let the 1794 VHSC module initialize as normal Wait for the OK indicator on the module to go solid green 2 You must place ladder logic in your PLC that performs the following A Set a value between 4 and 2 into output word 2 and or 3 B Then set 1 the M11 bit in the upper byte of control word 0 When the upper byte of the output word is not zero the status indicator flashes red and the TF bit bit 12 input word 8 is asserted C Next reset 0 the M11 bit in the upper byte of output control word 0 Clearing the upper byte of output word 0 restores the module to an operational state clears the TF bit in input word 8 and returns the indicator to green The module is now in inhanced mode 3 To turn this feature off A Set output word 2 or 3 to zero no value B Set 1 the M11 bit C Then reset 0 the M11 bit Publication 1794 U
24. lost 14 16 15 17 Not used set to 0 Channel 0 PWM Output value When the module is configured for PWM the time base is enabled the counter for the respective channel its gate interval rollover and 1st on and 1st off value are used Ties can be used to direct the PWM signal to any or all outputs The range of the PWM values is 00 17 0 lt value lt 9500 decimal i e 0 00 lt value lt 95 00 The actual duty cycle at the output depends on the turn on and turn off times of the MOSFET energy storage capability of the cable load and the resistance from output to return 7 c Word 2 Channel 1 PWM Output value When the module is configured for PWM the time base is enabled the counter for the respective channel its gate interval rollover and 1st on and 1st off value are used Ties can be used to 00 15 direct the PWM signal to any or all outputs The range of the PWM values is 00 17 0 value 9500 decimal i e 0 0096 value 95 0096 The actual duty cycle at the output depends on the turn on and turn off times of the MOSFET energy storage capability of the cable load and the resistance from output to return Word 3 Publication 1794 UM010B EN P March 2001 Input Output and Configuration Files for the Very High Speed Counter on ControlNet 4 15 Configuration AP Word EN Definition Counter Configuration The upper byte of this word configures counter 1 the lower byte counter 0 B
25. push the flexbus connector into the side of the adapter to complete the backplane connection wany 5 Repeat the above steps to install the next terminal base Publication 1794 UM010B EN P March 2001 2 6 How to Install Your Very High Speed Counter Module Panel Wall Mounting Installation on a wall or panel consists of laying out the drilling points on the wall or panel drilling the pilot holes for the mounting screws mounting the adapter mounting plate installing the terminal base units and securing them to the wall or panel If you are installing your module into a terminal base unit that is already installed proceed to Mounting the High Speed Counter Module on the Terminal Base on page2 8 Use the mounting kit Cat No 1794 NM1 for panel wall mounting 1794 NM1 Mounting Kit Contents 1 Mounting Plate for Adapter 2 18 6 self tapping screws 2 for the adapter and 2 each for up to 8 modules ULL T Mes TL Adapter Module 77 not included _ Ly s Terminal Base Unit not included Publication 1794 UM010B EN P March 2001 Inches Millimeters A 83 21 Y 3 lt 1 4 How to Install Your Very High Speed Counter Module 2 7 To install the mounting plate on a wall or panel 1 Lay out the required points on the wall panel as shown in the drilling dimension drawing Drilling Dimensions for Panel Wall Mou
26. unprogrammed window Bit 08 Counter 0 window ON and OFF values are equal and not zero or counter 0 window ON and OFF value greater than 16 777 215 Bit 09 Counter 1 window ON and OFF values are equal and not zero or counter 1 window ON and OFF value greater than 16 777 215 Bit 10 Reserved Bit 11 During hardware self tests when either flexbus power or terminal base power is first applied and a fatal error occurs the TF bit is asserted and the red module status indicator turns on An error code is placed in the lower byte of the module channel status word to indicate the failed resource Use a CIO instruction to access this information When using a CIO instruction this would be word 10 Read Word Definition Biso fo 0 1 1 RAM test failed 0150 F2 ROM checksum test failed Word 8 EE EEPROM test failed pt Popol 4 Programmable Gate Array loading failed All other combinations not used What s Next To find out more about the VHSC module See appendix A A For Specifications EN specifications on the 1794 VHSC module ca Publication 1794 UM010B EN P March 2001 5 4 Troubleshoot the Very High Speed Counter Module Publication 1794 UM010B EN P March 2001 Appendix A Specifications Specifications 1794 VHSC Very High Speed Counter Module Input Specifications Number of Counters Number of Inputs per Counter Input Voltage Input Current typical Input Off State Voltage Input Off State Current In
27. 99 Overview of the Very High Speed Counter Module How to Install Your Very High Speed Counter Module Table of Contents Chapter 1 Chapter Objectives crx nee runs mire ER 1 1 Module Description user dieu ete tree 1 1 Features ofthe Module 1 1 Operation in Encoder or Counter Mode 1 2 Courier Mod sieer eri nE nE D E tease rente 1 3 Encoder Mode ooo us Rez desta eae aaa aa 1 4 Preset ValS a eeu eh eu Ea Se e bt ies Cea 1 6 Rollover Value mte ER ERREUR REC Rx E 1 6 Software Reset 6642228 Lex EE ERE veis 1 6 Gate Reset Input ise rere RR RR EE 1 6 Operation in Period Rate Mode en e epe p ER 1 8 Continuous Rate Mode 1 11 Operation in Rate Measurement Mode 1 12 Pulse Width Modulation 1 13 QUIDIIS a oec o te mech anata eth ee ae eme ean 1 13 Enabling and Forcing Outputs 1 13 Assigning Outputs to Counter Windows 1 13 Operation of Outputs 1 14 What the Very High Speed Counter Module Does 1 15 Chapter SUMMER ee Ue pe fe tes te 1 16 Chapter 2 What This Chapter Contains 2 1 Before You Install Your Input Module 2 1 European Union Directive Compliance 2 1 EMG Directive Lost Re tn Se a utis ir sde aie 2 1 Low Voltage Directive
28. Base 1794 TB3G shown 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 SISISISISISISISISISISISISISISIS A A B BZ Z O0 O0 A A B B Z Z 02 03 p 24V Inputs 24N du 22 23 24 27 SISISISISISISISISISISISIS EISE m puru ye de Ee S SV Inputs SV Inputs Chassis Gnd 24V COM V 30 6 SS SIs IE 24V COM tr for Shields _ C Base Power Base Power Where A incremental encoder input A 5 or 24V dc B B incremental encoder input B 5 or 24V dc Z Z incremental encoder input Z 5 or 24V dc O sourcing outputs R returns for sourcing outputs V 5 or 24V dc isolated power externally supplied for outputs 1A max V negative isolated power connection 1A max 24V dc 24V dc terminal base power for module COM return for 24V dc terminal base power for module Chassis Gnd chassis ground for input or output cable shields Publication 1794 UM010B EN P March 2001 2 12 How to Install Your Very High Speed Counter Module Wiring connections for the 1794 VHSC High Speed Counter Module Terminal Base Units 1794 TB3G TB3GS Channel 0 Channel 1 24V Inputs Incremental Encoder Input Input A Input Input B Input B Input Z Input Z 5V Inputs Input Z Input Z Outputs oes eas ee or Te T a s sw 7 24V dc base Terminals 34 and 50 power 24V dc COM Terminals 35 and 51 5V or 24V Terminals 37 and 46 Output Pwr V Output Pwr Terminals 39 and 48 Chassis GND T
29. ControlNet capability The VHSC module once configured for its intended purpose can continue to operate without flexbus power Note Customer power is required for the module inputs and outputs After scanning the inputs and updating the outputs the input data is converted to a specified data type in a digital format to be transferred to the processor s data table on request Command and configuration data is sent from the programmable controller data tables to the module via ControlNet Features of the Module The HSC module counts pulses from encoders such as Allen Bradley Bulletin 845 pulse generators or mechanical limit switches proximity switches etc and returns either a count or frequency in binary format The module s features include 2counters configurable for 3 encoder modes counter mode period rate mode continuous rate mode rate measurement and pulse width modulation PWM 4 outputs isolated in pairs outputs are current sourcing at 5 or 12 24V dc 0 5mA max SV 1A max 12 24V single ended or differential inputs e 2 phase encoder inputs up to a frequency of 250KHz X 4 mode single phase counter inputs up to a frequency of 1MHz input voltage range of 5 or 24V dc Publication 1794 UM010B EN P March 2001 1 2 Overview of the Very High Speed Counter Module Operation in Encoder or Counter Mode Publication 1794 UM010B EN P March 2001 returns input as count or frequency in bin
30. M010B EN P March 2001 Input Output and Configuration Files for the Very High Speed Counter on ControlNet 4 7 High Speed Counter Module 1794 VHSC Image Table Mapping Module Image Fac Channel 0 Current Count least significant word ES Channel 0 Current Count most significant word ControlNet Files cet B Channel 1 Current Count least significant word Input File Size 1 to 9 Words lt EJ Channel 1 Current Count most significant word al Channel 0 Stored Accumulated Count least significant word 5 Channel 0 Stored Accumulated Count most significant word g Channel 1 Stored Accumulated Count least significant word Channel 1 Stored Accumulated Count most significant word e Pe re wal TF os os os os ci co zr zs ci co z zs o Reseved fum Reserved o fvr cr cn o fvr cP cr CRE mom LS peer ofue oefrof o u o rof o ue or fro gl Channel 0 PWM Output Value 0 95 00 E Channel 1 PWM Output Value 0 95 00 Configuration File Size SC Geetd e A 000 K meme O DENEN NNNM Fem 0 CS MM MM NNNM EA NNNM a eeror Nd Channel 1 Rollover Value least significant word OT K art tam D TT T KA PR ET O D nr md C E se Publication 1794 UM010B EN P March 2001 4 8 Input Output and Configuration Files for the Very High Speed Counter on ControlNet Configuration File Size 6 0 0 0 o o 0 0 0 sa ss sz si ra ra Fo Ft EE CAERERERERERERCRERETETESETED ES ET Rens First Count
31. and rate measurement configurations Channel 1 Rollover Sets the number of counts the counter accumulates before rolling over For example a setting of 1000 produces a count sequence of 998 999 0 1 2 while incrementing and 2 1 0 999 998 while decrementing Rollover is a 32 bit number with a usable range of 16 777 216 In PWM this value is zero in count X1 encoder X2 encoder and X4 encoder configurations it must be some specified nonzero number The value doesn t matter in period rate continuous rate and rate measurement configurations Channel 0 Preset This word sets the preset value the counter is loaded with when CP is asserted This number has a range of 0 lt value 16 777 216 Channel 1 Preset This word sets the preset value the counter is loaded with when CP is asserted This number has a range of 0 value 16 777 216 Input Output and Configuration Files for the Very High Speed Counter on ControlNet 4 17 CORN EN Definition Channel 0 Scaler This word scales the Z signal in period rate and continuous rate modes If the filter is applied the filtered Z signal is scaled Set only 1 bit of the Scaler Bits 00 15 Selecting a Scaler causes accumulated counts to be adjusted accordingly i e selecting a 00 17 Scaler of 128 increases the accumulated count by 128 after 128 Z pulses have been received We recommend using the filter to reduce erroneous frequency readings any time you use the Scaler on the Z
32. and the green indicator momentarily turns on the 24V dc power is below the module minimum Field power fault bit FP If the 24V dc module power drops the FP bit is asserted the green module indicator flashes the module outputs turn off and the module enters an idle state reporting status as it waits for power to be restored Note this bit does not indicate status of either output customer power supply Programming error bit PE This bit is asserted if incomplete incorrect or conflicting set of configuration parameters are sent to the module The green module status indicator will flash and an error code will be placed in bits 11 0 of the module channel status word The module will not enter a normal operating state Bit definitions are shown in Chapter 5 Publication 1794 UM010B EN P March 2001 4 12 Input Output and Configuration Files for the Very High Speed Counter on ControlNet Output Word Definition 00 15 00 17 Counter Control Word Channel 0 Counter reset bit CR A 0 to 1 transition of this bit clears the counter Outputs are adjusted according to the window compare values Channel 0 Counter preset bit CP A 0 to 1 transition of this bit sets the counter to the value specified by the preset words Outputs are adjusted according to the window compare values 0 Channel 0 Value reset bit VR A 0 to 1 transition of this bit clears the stored accumulated count words D 03 This bit is always 0 Ch
33. annel 1 Counter reset bit CR A 0 to 1 transition of this bit clears the counter Outputs are adjusted according to the window compare values Word 0 Channel 1 Counter preset bit CP A 0 to 1 transition of this bit sets the 05 counter to the value specified by the preset words Outputs are adjusted according to the window compare values Channel 1 Value reset bit VR A 0 to 1 transition of this bit clears the stored accumulated count words 07 This bit is always 0 08 10 10 12 Reserved for factory use Frequency Resolution enhancement bit M11 Refer to input word 8 11 13 Set this bit to 1 for enhancement Note that you must place a value between 4 and 42 in output word 3 and or 4 12 15 14 17 Reserved for factory use Publication 1794 UM010B EN P March 2001 Input Output and Configuration Files for the Very High Speed Counter on ControlNet 4 13 Output Word Definition 00 15 00 17 Output Control Word Output 0 Force output bit FO When set to 1 output is turned on if OE is 1 When FO 0 output can be controlled by a compare match or as directed by the PWM settings Output 0 Output enable bit OE When set to 1 output can be turned on from a force on compare match or as directed by the PWM settings When OE 0 the associated output is turned off Output 0 Local control bit LC When set to 1 output is controlled the counter if the flexbus power is lost i e the module detects a flexbus re
34. ary format input counts as high as 16 777 215 upto 1MHz in period rate or rate measurement frequency modes outputs can be tied to any or all counter windows each output has a user selectable on off value outputs can be tied back to an input for cascading each counter has a user selectable preset and rollover value totalization is provided in period rate continuous rate and rate measurement modes module can continue counting without flexbus power after configuration outputs have safe state values which can be applied when there is a network failure or the PLC is switched to PROGRAM mode pulse width modulation PWM mode is available The 1794 VHSC module operates in the following modes counter mode encoder X1 mode e encoder X2 mode encoder X4 mode period rate mode continuous rate mode rate measurement frequency mode pulse width modulation PWM The operation of the module in these modes is described below The operation of encoder and counter modes is virtually identical The only difference between the two modes is in the type of feedback used Use the counter mode if you need the module to read incoming pulses from a maximum of 2 encoders single ended or differential counters pulse generators mechanical limit switches etc and return them to the programmable controller as a binary number 0 16 777 215 Use the encoder modes if you need the module to read incoming qua
35. ation Allen Bradley 1 ALLEN BRADLEY DR MAYFIELD HEIGHTS OH 44124 9705 NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES PLEASE REMOVE D Rockwell Automation Allen Bradley a Rockwell Automation Business has been helping its customers improve productivity and quality for more than 90 years We design manufacture and support a broad Allen Bradley range of automation products worldwide They include logic processors power and motion control devices operator interfaces sensors and a variety of software Rockwell is one of the world s leading technology companies Worldwide representation CE L7 i Argentina Australia Austria Bahrain Belgium Brazil Bulgaria Canada Chile China PRC Colombia Costa Rica Croatia Cyprus Czech Republic Denmark Ecuador Egypt El Salvador Finland France Germany Greece Guatemala Honduras Hong Kong Hungary Iceland India Indonesia Ireland Israel Italy e Jamaica Japan Jordan Korea Kuwait Lebanon Malaysia Mexico Netherlands New Zealand Norway Pakistan Peru Philippines Poland Portugal Puerto Rico Qatar e Romania Russia CIS Saudi Arabia Singapore Slovakia Slovenia South Africa Republic Spain Sweden Switzerland Taiwan Thailand Turkey United Arab Emirates United Kingdom United States Uruguay Venezuela Yugoslavia Allen Bradle
36. de state Clearing the upper byte of output word 0 restores the module to an operation state clears the TF bit and returns the indicator to green 0x08 This test mode is only for use in modules with firmware revision D or later Change significant digits of frequency display based on word 14 for channel 0 and word 15 for channel 1 2 moves decimal point left 2 places dividing the frequency value by 100 1 moves the decimal point 1 place multiplying by 10 and so on This allows frequency values to fit in a single word CAUTION Use this test mode with caution since no check is performed to assure that the returned frequency is meaningful Firmware revision D changed decimal point placement to absolute positioning Revision D firmware also checks for placement to be in the range of 4 to 2 A value outside the range moves the decimal point to the zero position Moving the decimal point to the left allows high frequencies commonly present in rate measurement to fit within a single word Moving the decimal point to the right allows low frequencies commonly present in period and continuous rate modes to have resolution displayed to 0 1Hz and 0 01Hz Do not use scalars of Z 128 Z 64 Z 32 and Z 16 when using this test mode Not ready status bit NR Whenever 24V dc power is applied to the module the hardware must be initialized The NR bit will be asserted and the red module indicator will flash If the red indicator continues flashing
37. drature pulses and return them to the programmable controller as a binary number 0 16 777 215 In these modes the module accepts two phase quadrature feedback and counts up or down depending upon the condition of the phase B input for each counter Overview of the Very High Speed Counter Module 1 3 The operation of the module in the encoder counter modes is as follows counter mode channel B is direction control up or down Channel A input is used for pulse The count is bidirectional with the direction determined by channel B encoder X1 This is a bidirectional count mode counting up or down using quadrature input signals encoder X2 This is a bidirectional count mode using quadrature input signals with 2 times the resolution of X1 encoder X4 This is a bidirectional count mode using quadrature input signals with 4 times the resolution of X1 Each of the counters in encoder counter mode has values associated with it These are preset value rollover value Counter Mode The counter mode allows the module to read incoming pulses and return them to the programmable controller processor as a binary number 0 16 777 215 In the counter mode direction up counting or down counting is determined by the phase B input which can be a random signal If Phase B is high the counter will count down If phase B is low or floating that is not connected the counter counts up If Phase B is Counter wi
38. e reset to be divided by a number in the range of 1 2 4 8 16 32 64 and 128 Store Count The store count feature allows the module to store the current count value of the associated counter The store count feature is triggered by the state of the gate reset terminal on the module The stored count of each counter is placed in a separate word in the Read Data file The stored count value will remain in the Read Data file until a new trigger pulse is received at the Gate Reset terminal When a new trigger pulse is received the old count value will be overwritten by the new value Overview of the Very High Speed Counter Module 1 7 In mode 1 store continue figure 1 3 the leading edge of a pulse input on input Z gate reset terminal causes the current value in the counter to be read and stored The counter will continue counting The stored count will be available in the Read Data file The stored count information will remain in the block transfer read file until it is overwritten by new data Figure 1 3 Store Continue Read Store Count and continue counting N 10680 1 In mode 2 store wait resume figure 1 4 a rising edge of a pulse input on the Z input gate reset terminal reads and stores the current counter value in the Read Data file and inhibits counting while the gate reset input is high Counting resumes when the input goes low Mode 2 does not reset the counter although it does store the count value The stored
39. eas in this manual which are different from previous editions are marked with change bars as shown to the right of this paragraph to indicate the addition of new or revised information Publication 1794 UM010B EN P March 2001 soc ii Summary of Changes Publication 1794 UM010B EN P March 2001 Preface Using This Manual Purpose of This Manual This manual shows you how to use the Very High Speed Counter module with an Allen Bradley programmable controller It helps you install program and troubleshoot your module Audience You must be able to program and operate an Allen Bradley programmable controller PLC to make efficient use of this module We assume that you know how to do this in this manual If you do not refer to the appropriate programming and operations manual for the associated programmable controller before you attempt to use this module Vocabulary In this manual we refer to the Very High Speed Counter module as the module the 1794 VHSC or the VHSC module the programmable controller as the controller or the PLC Manual Organization This manual is divided into 5 chapters The following chart shows each chapter with its corresponding title and a brief description of the topics covered in that chapter Explanation of modes outputs and how the Overview of the Very High Speed Counter Module module communicates with the processor s How to install key connect wiring gro
40. emplacements de Classe 1 Division 2 Groupes A B C D ou ne convient qu l utilisation dans des endroits non dangereux Les produits portant le marquage appropri de la CSA c est dire Classe 1 Division 2 Groupes A B C D sont certifi s l utilisation pour d autres quipements o la convenance de combinaison application ou utilisation est d termin e par la CSA ou le bureau local d inspection qualifi Important Par suite de la nature modulaire du syst me de contr le PLC le produit ayant le taux le plus lev de temp rature d termine le taux d ensemble du code de temp rature du syst me de contr le d un PLC dans un emplacement de Classe 1 Division 2 Le taux du code de temp rature est indiqu sur l tiquette du produit Taux du code de temp rature CLI DIV 2 GP A B C D SP __TEMP Les avertissements suivants s appliquent aux produits ayant la certification CSA pour leur utilisation dans des emplacements dangereux Le taux du code de temp rature est indiqu ici AVERTISSEMENT Risque d explosion La substitution de composants peut rendre ce mat riel inacceptable pour lesemplacements de Classe Division 2 Couper le courant ou s assurer quel emplacement est d sign non dangereux avant de remplacer lescomposants Avant de d brancher l quipement couper le courant ou s assurer que l emplacement est d sign non dangereux Avant de d brancher les connecteu
41. er 1st Off Value least significant word First Counter 1st Off Value most significant word ae Fae wwe TT TT IN First Counter 3rd On Value most significant word First Counter 3rd Off Value least significant word Publication 1794 UM010B EN P March 2001 Configuration File Size continued 56 Words Input Output and Configuration Files for the Very High Speed Counter on ControlNet 4 9 sa SesondCouter rdOnVale essispniontwod a5 Second Counter 3rd On Value most significant word e Sea cowmersra onu patins NE Output Control Safe State Channel 0 PWM Safe State 52 Counter Control Safe State EJ Channel 1 PWM Safe State Input Word E Definition Word 0 sge Channel 0 current count The current count consists of 2 words 32 bits 00 17 representing the current count of the 24 bit counter in encoder X2 encoder 00 15 X4 encoder PWM or the frequency in period rate continuous rate rate Word 1 00 17 measurement The range of values is 0 lt value lt 16 777 215 Word 2 ae Channel 1 current count The current count consists of 2 words 32 bits 00 17 representing the current count of the 24 bit counter in encoder X2 encoder 00 15 X4 encoder PWM or the frequency in period rate continuous rate rate Word 3 00 17 measurement The range of values is 0 lt value lt 16 777 215 Channel 0 stored accumulated count These are 32 bit long word values representing the stored count o
42. erminals 16 33 and 40 thru 45 ATTENTION Total current draw through the terminal base unit is limited to 10A Separate power connections to the terminal base unit may be necessary Publication 1794 UM010B EN P March 2001 How to Install Your Very High Speed Counter Module 2 13 Example of Quadrature Encoder Differential Wiring to a 1794 TB3G Terminal Base Unit eere Quadrature Encoder ex 845H SJ 24DRY Z Store Count Gate Reset Mechanical Switch 0 15 16 33 B SS 9 1794 TB3G 24V Base Power Solenoid Attention Keep exposed area of inner conductor as short as possible Publication 1794 UM010B EN P March 2001 2 14 Module Indicators Publication 1794 UM010B EN P March 2001 How to Install Your Very High Speed Counter Module The high speed counter module has one red green status indicator OK that is on when power is applied to the module and one yellow indicator for each input and output NI Flex LO Allen Bradley 1794 VHSC VERY HIGH SPEED COUNTER MODULE mm A Power status indicator indicates power applied to module and status of module B Insertable label for writing individual I O assignments Status Indicators A Status of input A B Status of input B Z Status of gate input Z OUT Output indicators 1 for eac
43. ers data to and from the module over the flexbus Instructions in the PLC facilitate this communication and let you write output values and configure the module s mode of operation The following illustration describes the communication process 2 The adapter transfers your configuration data External devices transmit to the module frequency signals to the module Flexbus D e MESE O eid san The adapter transfers the data LE Ze over the flexbus RN alla 0000000000000000 a i ee OD I GE di DE 16 ET i6 dT 1i dI CC 4I 1f iD 1i 1 Semen E 22 OOOOOOOOOOOO0O0O0000 kal i The adapter and module determine L that the transfer was made without error and input values are within a specified range ControlNet transfers the data to the programmable controller data table The module converts frequency signals into integer format and stores these values until the adapter requests their transfer 1 The adapter transfers your configuration data and commands to the module 2 External devices generate input signals module that are transmitted to the
44. erval 3 is 300ms to determine ZF Input Output and Configuration Files for the Very High Speed Counter on ControlNet 4 11 Input Word Word 8 continued 06 07 08 11 10 13 12 14 13 15 14 16 15 17 Definition Stored data count bit CO C1 for Channel 1 This count cycles thru 00 01 10 11 00 Each time the stored accumulated count words are updated C 0 1 is incremented The PLC sample rate including network delay and program scan must be as fast or faster than the frequency of the event which updates Output status indicators OS Bit 08 corresponds to output 0 bit 09 to output 1 bit 10 to output 2 and bit 11 to output 3 0 output Off 1 output On Test fail bit TF If the flexbus power or terminal base power is applied and the module fails during hardware tests a fatal error occurs The TF bit is asserted and the red module indicator turns on An error code will be set in the module channel status word which can be read using a CIO instruction The TF bit is also asserted if the upper byte of the counter control word is not zero The upper byte of the counter control word is reserved for special modes Only mode 8 Enhancing Frequency Resolution is available To use this mode set bit 11 and set a value in output woed 3 and or 4 When the upper byte of word 12 is not zero the red module status indicator will flash and the TF bit is asserted to indicate the module has entered a test mo
45. es count the total number of pulses occurring at the Z gate reset pin This function is frequency limited to 200Hz X the scaler value You can reset this count by setting the VR bit Figure 1 7 shows a diagram of the module used in the period rate mode Overview of the Very High Speed Counter Module 1 9 Figure 1 7 Period Rate Mode A not used Input A B not used Input B Z gate reset Single Phase Pulse Generator Input Z scaler 5MHz Clock 1794 VHSC Incoming pulse train at Z gate reset terminal 5MHz internal clock 1 10 20 Frequency and Outputs Accumulated Count updated here Assumes symmetrical pulse 50 duty cycle so period sample time on X 2 on and off Frequency 1 period If count 25 scaler 1 and clock period 1 5MHz Frequency 1 25 1 X 1 5MHz X 2 100KHz In Figure 1 7 the incoming pulse train from the gate reset terminal is used to sample pulses from the 5MHz internal clock As the frequency of the incoming pulse train at the gate reset terminal increases the number of sampled pulses from the 5Mhz clock decreases This relationship is shown in NO TAG Since accuracy is related to the number of pulses received over the sample period the accuracy will decrease with increasing input frequencies at the Gate Reset terminal To some extent the decrease in accuracy can be lessened by scaling the input frequency through the use of a scaler A scaler value of 1 will only return a
46. f input signal pulses Each output is turned on as soon as the turn on count is reached and turned off as soon as the turn off count is reached As the internal 5MHz clock is counted the outputs dynamically track the 5MHz count This allows you to turn an output on a certain number of 5MHz counts after the gate reset pin goes active and turn it off a certain number of 5MHz counts later 1794 VHSC modules count the total number of pulses occurring at the Z gate reset terminal This function is frequency limited to 200Hz X the scaler value This total count is returned in input file words 4 LSW and 5 MSW for channel 0 and 6 LSW and 7 MSW for channel 1 You can reset this count by setting the VR bit Figure 1 8 Period Rate and Continuous Rate Output Operation with Scaler of 1 A not used Input A Input B Encoder Pulse Generator Input Z scaler 5MHz Clock 1794 VHSC Incoming pulse train at Z gate reset terminal 5MHz internal clock Accumulated Count Frequency updated here Outputs updated continuously Assumes symmetrical pulse 5096 duty cycle so period sample time on X 2 on and off Frequency 1 period If count 25 scaler 1 and clock period 1 5MHz Frequency 1 25 1 X 1 5MHz X 2 100KHz Publication 1794 UM010B EN P March 2001 1 12 Overview of the Very High Speed Counter Module Operation in Rate Use the rate measurement mode to count incoming pulses for a
47. f the counter at the time of some specified event Word 4 00 15 These words are not updated in counter modes counter X1 encoder X2 00 17 encoder X4 encoder without store modes selected With store modes selected it is the counter value at the time of the specified Z input event In PWM configuration it is the counter value at the end of the period specified by the product of the time base times gate interval In period rate and continuous rate it is the total accumulation of unscaled Z pulses i e if scaling is set to 128 the accumulator will increase by 128 counts The maximum frequency that accumulation can follow is 200Hz X 00 15 Scaler value Word 5 00 17 In rate measurement it is the total number of pulses seen at the A input accumulated over each period as specified by the product of time base times gate interval The range of values occupy the entire 32 bit size from 0 value 4 294 967 295 These words are not cleared by changing the configuration Publication 1794 UM010B EN P March 2001 4 10 Input Output and Configuration Files for the Very High Speed Counter on ControlNet Definition Channel 1 stored accumulated count These are 32 bit long word values representing the stored count of the counter at the time of some specified event These words are not updated in counter modes counter X1 encoder X2 encoder X4 encoder without store modes selected With store modes selected it is the counter val
48. g Module 1 0 Mapping The I O map for the VHSC module is divided into read words and write words Read words consist of input and status words and write words consist of output and configuration words The number of read words or write words can be 0 or more The length of each I O module s read words and write words vary in size depending on module complexity Each I O module will support at least 1 input word or 1 output word Status and configuration are optional depending on the module The VHSC module has 9 input words no status words 4 output words and 56 configuration words Application of New Configurations When a configuration is sent to the 1794 VHSC module it is checked for consistency before being applied If an error is found in the configuration the PE bit input word 8 bit 15 is asserted and the module locally retains its previous configuration To isolate any problems an improperly configured module may have the user application program i e ladder program should monitor this error Input Output and Configuration Files for the Very High Speed Counter on ControlNet 4 3 If the configuration is considered acceptable the counter application specific integrated circuit ASIC is disabled i e counting is suspended and outputs are shut off while the ASIC is loaded with the new operational parameters 1 0 Structure Output data is received by the adapter in the order of the installed I O modules The Output data f
49. h output Indicator A OUT 0 1 2 3 Explanation Yellow Input A active Input A not active Yellow Input B active Input B not active Yellow Input Z active Input Z not active Yellow Output is on Individual output is off Chapter Summary How to Install Your Very High Speed Counter Module 2 15 Indicator Indication Explanation OK Red solid Hardware diagnostic error TF set to 1 and module channel status contains error code Hardware runtime failure i e watchdog timeout module communication ceases Red flashing Module is configuring hardware NR is set to 1 Module in test mode bits 15 8 of counter control word are non zero TF set to 1 Green solid Module is active and operating normally Green flashing Module is not configured Programming error PE is set to 1 and error code is supplied in bits 11 0 of module channel status word Field power fault FP setto 1 Adapter powered down and module local power still active ControlNet cable disconnected e PLC in PROG mode When an input indicator yellow is lighted it indicates that a valid signal active high or active low is present at one of the Input terminals In this chapter we told you how to install your input module in an existing programmable controller system and how to wire to the terminal base units Publication 1794 UM010B EN P March 2001 2 16 How to Install Your Very High Speed Counter Module
50. ified as open equipment and must be mounted in an enclosure during operation to provide safety protection The wiring of the terminal base unit is determined by the current draw through the terminal base Make certain that the current draw does not exceed 10A ATTENTION Total current draw through the terminal base unit is limited to 10A Separate power connections may be necessary How to Install Your Very High Speed Counter Module 2 3 Methods of wiring the terminal base units are shown in the illustration below Wiring the Terminal Base Units 1794 TB3G shown ATTENTION Do not daisy chain power or ground from the terminal base unit to any ac or dc digital module terminal base unit Daisy chaining E i Frequency Input VHSC VHSC VHSC Module Module Module Module 0000000000000000 _ 0000000000000000 0000000000000000 0000000000000000 M ET TT TT Ese TOO DO000000000000000 DO000000000000000 DOO00000000000000 DOO000 00000000 O0000000000000000 00000000000000000 00000000000000000 0000000000000000 3 IE Lu LU Li ETT 24V dc Note Do not use any digital modules in this configuration Wiring when total current draw is less than 10A
51. inal base units with installed FLEX I O modules forming a FLEX I O system of up to eight slots The adapter communicates to other network system components typically one or more controllers or scanners and or programming terminals over the ControINet network The adapter communicates with its I O modules over the backplane 1 0 Module 1 0 Module 1 0 Module ow Read Configuration Words Configuration Configuration 15 Slot 0 Slot 1 Slot 7 Data is exchanged scheduled when mapped or unscheduled using CIO instructions 4 2 Input Output and Configuration Files for the Very High Speed Counter on ControlNet Publication 1794 UM010B EN P March 2001 Scheduled Data Transfer Scheduled data transfer iscontinuous isasynchronous to the ladder logic program scan occurs at the actual rate displayed in the Actual Packet Interval field on the programming software ControlNet I O mapping monitor screen Unscheduled Data Transfer Unscheduled operations include unscheduled non discrete I O data transfers through ControlNet I O Transfer CIO instructions peer to peer messaging through Message MSG instructions messaging from programming devices Unscheduled messaging on a ControlNet network is non deterministic Your application and your configuration number of nodes application program NUT amount of scheduled bandwidth used etc determine how much time there is for unscheduled messagin
52. ins frequency at which the 24 bit counter overflows 4 768Hz Z 64 Fmins frequency at which the 24 bit counter overflows 9 537Hz Z 128 Fmins frequency at which the 24 bit counter overflows 19 073Hz Output Ties These bits connect the specified output to the appropriate compare window There are 8 windows 4 per counter Each output can be connected to any number of windows from 1 ot 8 F1 Tie output to first counter 1st window F2 Tie output to first counter 2nd window F3 Tie output to first counter 3rd window F4 Tie output to first counter 4th window S1 Tie output to second counter 1st window S2 Tie output to second counter 2nd window S3 Tie output to second counter 3rd window S4 Tie output to second counter 4th window Bits 08 15 Setto 0 10 17 Word 15 Words 16 to 19 Publication 1794 UM010B EN P March 2001 4 18 Input Output and Configuration Files for the Very High Speed Counter on ControlNet Conr don Definition Counter On and Off These words program each of the 4 counter s first and second counter on and off values The first compare window for each counter is used in PWM and when programmed for PWM the associated compare window should remain at 0 The Bits 00 15 range of each entry is 0 value 16 777 215 When a tie is connected to a window 00 17 comparator that window must be specified These windows are always interpreted as counts regardless of the configuration se
53. ion 2 Do not replace components unless power has been switched off or the area is known to be non hazardous Do not disconnect equipment unless power has been switched off or the area is known to be non hazardous e Do not disconnect connectors unless power has been switched off or the area is known to be non hazardous Secure any user supplied connectors that mate to external circuits on an Allen Bradley product using screws sliding latches threaded connectors or other means such that any connection can withstand a 15 Newton 3 4 Ib separating force applied for a minimum of one minute CSA logo is a registered trademark of the Canadian Standards Association PLC is a registered trademark of Allen Bradley Company Inc Approbation d utilisation dans des emplacements dangereux par la CSA La CSA certifie les produits d utilisation g n rale aussi bien que ceux qui S utilisent dans des emplacements dangereux La certification CSA en vigueur est indiqu e par l tiquette du produit et non par des affirmations dans la documentation l usage des utilisateurs Exemple d tiquette de certification d un produit par la CSA CL DIV 2 GP A B C D TEMP Pour satisfaire la certification de la CSA dans des endroits dangereux les informations suivantes font partie int grante de la documentation des produits industriels de contr le Allen Bradley certifi s par la CSA Cet quipement convient l utilisation dans des
54. its 00 03 09 02 or 00 Counter 0 Bits08 11 11 10 o9 08 0 13 13 42 11 10 Counter t Counter DT fee Hg 1 Period Rate Configuration EXEXESES Continuous Rate Word 0 HKH 1 Rate Measurement 4 Mode Selection Fer w e o on o fo fo Store count disabled pojot Mode 1 store continue Po ft 0 Mode 2 store wait resume EENE Mode 3 store reset wait start mgg Mode 4 store reset start Bit 15 17 Invert the Z signal 0 Z not inverted 1 Z inverted Publication 1794 UM010B EN P March 2001 4 16 Input Output and Configuration Files for the Very High Speed Counter on ControlNet Configuration Word Bits 00 03 Bits 08 11 10 13 Word 1 Bits 00 15 00 17 Word 2 Bits 00 15 Word 3 00 17 Bits 00 15 00 17 Bits 00 15 Word 5 00 17 Bits 00 15 00 17 Word 4 Word 6 and 7 Bits 00 15 00 17 Word 8 and 9 Word 10 and Bits 00 15 11 00 17 Word 12 and Bits 00 15 13 00 17 Publication 1794 UM010B EN P March 2001 Definition Filter Selection Only 1 filter selection can be chosen at a time Frequency 50 duty cycle EEC 08 EXER EX ES No filter ss emp s 50kHz 10us Ous 1 6us KE ES EI 5kHz 100us Ous 13 2us EGESEZ EZ 500Hz 1 0ms 0ms 1 25us Mod 50Hz 10 0ms Oms 1 25ms Input A filter bit AF 0 not filtered 1 apply filter to input Input B filter bit BF 0 not filtered 1 apply filter to inp
55. lation Outputs Overview of the Very High Speed Counter Module 1 13 Sample Period You can set the sample period used in the frequency calculation in the rate measurement mode Allowable values are 10 milliseconds to 3 seconds in 10 millisecond increments The default value is 1 second Connection to Counter Inputs The only user connections used in the rate measurement mode are to phase A of the module The Z gate reset and channel B terminals are not used in this mode The module can generate a pulse width modulation signal that may be tied to any output By specifying a period configuration word 2 and gate interval configuration word 2 or 3 together with the PWM configuration word 2 or 3 a counter and its first ON OFF window comparator is assigned and the signal generated The actual duty cycle is specified by output words 2 and 3 The VHSC module has 4 outputs isolated in groups of 2 Each of the outputs is capable of sourcing current and will operate between 5 and 24 volts dc You must connect an external power supply to each of the outputs The outputs can source 1A dc alone or in combination The outputs are hardware driven and will turn on in about 25us when the appropriate count value has been reached Enabling and Forcing Outputs Outputs may be forced on or off independent of count or frequency value To force the outputs they must first be enabled Enabling the outputs is done through a data table word 1 bits 1 5
56. ll count direction High Down Low or floating not connected Up The module reads incoming pulses from a maximum of 2 encoders single ended or differential counters pulse generators mechanical limit switches and so forth and returns a count to the programmable controller processor in a binary number 0 16 777 215 The counter mode accepts only one phase feedback This relationship is shown in figure 1 1 Publication 1794 UM010B EN P March 2001 1 4 Overview of the Very High Speed Counter Module Figure 1 1 Block Diagram of Counter Mode B Input Count Publication 1794 UM010B EN P March 2001 1794 VHSC Count Down 3 2 1 0 Outputs updated continuously Encoder Mode The encoder mode allows the module to read incoming pulses and return them to the programmable controller processor as a binary number 0 16 777 215 In this mode the module will accept two phase quadrature feedback The module senses the relationship between the 2 phases and counts up or down accordingly Encoder X1 mode quadrature input signals count on the leading edge or the trailing edge of channel A for a bidirectional count The phase relationship between Channel A and Channel B determines direction channel A leading and channel B floating the count direction is up channel A lagging and channel B high the count direction is down Encoder X2 mode quadrature input signals count on the leading edge and the trailing edge of
57. manent damage to the module will result Publication 1794 UM010B EN P March 2001 2 10 How to Install Your Very High Speed Counter Module Publication 1794 UM010B EN P March 2001 Connect individual output wiring to terminals 6 7 and 14 15 on the 0 15 row A and terminals 23 24 and 31 32 on the 16 32 row B on the terminal base unit Connect output return wiring for channels 0 1 2 and 3 to terminals 23 24 31 and 32 respectively Connect the output devices as shown in the wiring table on page 2 12 Terminate any shield to terminals 16 or 33 on row B or 40 through 45 on row C Connect 24V dc to terminal 34 on the 34 51 row C and 24V common to terminal 35 on the 34 51 row C ATTENTION To reduce susceptibility to noise power VHSC modules and digital modules from separate power supplies Do not exceed a length of 33 ft 10m for dc power cabling If daisy chaining the 24V dc power to the next base unit connect a jumper from terminal 50 24V on this base unit to terminal 34 and from terminal 51 24V dc common to terminal 35 on the next base unit Connect output power wiring to terminals 37 and 39 for outputs 0 and 1 and terminals 46 and 48 for outputs 2 and 3 ATTENTION Do not daisy chain power or ground from the VHSC terminal base unit to any ac or dc digital module terminal base unit How to Install Your Very High Speed Counter Module 2 11 Connections for Terminal
58. n accurate input frequency if incoming pulses have a 50 duty cycle Publication 1794 UM010B EN P March 2001 1 10 Overview of the Very High Speed Counter Module Publication 1794 UM010B EN P March 2001 Table 1 A Relationship Between Sampled Pulses and Input Frequency Input Frequency at Z Sampled Pulses for 1 2 Cycle Gate Reset of Z Gate Reset Pulse Terminal in Hz 2 1 25M 5 500K 10 250K 20 125K 50 50K 100 25K 200 12 5K 500 5K 1KHz 2 5K 2KHz 1 25K 5KHz 500 10KHz 250 20KHz 125 50KHz 50 100KHz 25 Operation of scaler In period rate mode the scaler lets the incoming pulse train at the Z gate reset terminal be divided by a user defined number Acceptable values for the scaler are 1 2 4 8 16 32 64 and 128 There is one scaler value for each counter ATTENTION Sample period times scaler must be less than 6 71 seconds in order to avoid a zero frequency detect indication Connection to Counter Inputs The only input to the module in the period rate mode is made to the Z gate reset terminal The counter inputs channel A and B are not used in the period rate mode Continuous Rate Mode Overview of the Very High Speed Counter Module 1 11 The continuous rate mode is similar to the period rate mode previously described except the outputs in this mode are dynamic outputs Use this mode to determine the frequency of input pulses by counting the number of internal 5MHz clock pulses over a user specified number o
59. nting of FLEX I O 2 3 1 4 2 3 1 4 35 5 68 5 355 595 355 2 Drill the necessary holes for the 6 self tapping mounting screws 3 Mount the mounting plate 1 for the adapter module using two 6 self tapping screws 18 included for mounting up to 8 modules and the adapter Important Make certain that the mounting plate is properly grounded to the panel Refer to Industrial Automation Wiring and Grounding Guidelines publication 1770 4 1 4 Hold the adapter 2 at a slight angle and engage the top of the mounting plate in the indention on the rear of the adapter module 5 Press the adapter down flush with the panel until the locking lever locks 6 Position the terminal base unit up against the adapter and push the female bus connector into the adapter 7 Secure to the wall with two 6 self tapping screws 8 Repeat for each remaining terminal base unit Note The adapter is capable of addressing eight modules Do not exceed a maximum of eight terminal base units in your system Publication 1794 UM010B EN P March 2001 2 8 How to Install Your Very High Speed Counter Module Mounting the High Speed Counter Module on the Terminal Base Unit The 1794 VHSC module mounts on a 1794 TB3G or TB3GS terminal base unit 1 Rotate the keyswitch 1 on the terminal base unit 2 clockwise to position 1 as required for this module 2 000000 SS LL LL LS TT La
60. o alert you to possible injury to people or damage to equipment under specific circumstances ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attention helps you identify a hazard avoid the hazard recognize the consequences Important Identifies information that is especially important for successful application and understanding of the product Important We recommend you frequently backup your application programs on appropriate storage medium to avoid possible data loss FLEX I O DeviceNet DeviceNetManager and RediSTATION are trademarks of Allen Bradley Company Inc PLC PLC 2 PLC 3 and PLC 5 are registered trademarks of Allen Bradley Company Inc All other brand and product names are trademarks or registered trademarks of their respective companies Summary of Changes This publication contains new and revised information not included in the last release New Information Information has been added to allow you to enhance frequency resolution on smodules with firmware revision D or later Appendix B has been added to illustrate the criteria for CSA hazardous location approval Revised Information Chapter 4 has been revised to include information on using the frequency resolution feature included in later modules In addition the data table image has been revised to include the mode Change Bars The ar
61. or Slot 0 is received first followed by the Output data for Slot 1 and so on up to slot 7 The first word of input data sent by the adapter is the Adapter Status Word This is followed by the input data from each slot in the order of the installed I O modules The Input data from Slot 0 is first after the status word followed by Input data from Slot 2 and so on up to slot 7 Network READ Output Data Adapter Input Status Word ControlNet Adapter Read Data Adapter Status Slot 0 Input Data Slot 1 Input Data Slot 7 Input Data The input status word consists of I O module fault bits 1 status bit for each slot node address changed 1 bit created by PLC 5 controller T O status 1 bit created by PLC 5 controller I O Module Fault Bits ST Bit 15 10 through 15 98765432 10 r jce o sriceo e o sS sS S S S S S S Not Used ajajajaj alaaa Created by PLC 5 controller I O State Bit Node Address Changed Bit The adapter input status word bit descriptions are shown in the following table Publication 1794 UM010B EN P March 2001 4 4 Input Output and Configuration Files for the Very High Speed Counter on ControlNet Bit Description CS Explanation ru il This bit is set 1 when an error is detected in slot position 0 fee ti This bit is set 1 when an error is detected in slot position 1 This bit is set 1 when an error is detected in slot position 2 ME This bit is set 1 when an err
62. or is detected n slot Doc 3 4 This bit is set 1 when an error is detected in slot position 4 This bit is set 1 when an error is detected in slot position 5 6 This bit is set 1 when an error is detected in slot position 6 This bit is set 1 when an error is detected in slot position 7 Ab Le Ex du Mores D node address switch setting has been controller I O State Created by EX Bit 0 idle PLC 5 controller Bit 1 run Not used set to 0 Possible causes for an I O Module Fault are transmission errors on the FLEX I O backplane afailed module amodule removed from its terminal base incorrect module inserted in a slot position the slot is empty the slot contains a non discrete module Safe State Data The ControlNet adapter does not provide storage for alternate module output data during communication faults or processor idle state This safe state data is stored in the VHSC module and may be defined using configuration software Safe state data assures that a known output will be applied to the output devices to maintain a previously designated safe operating condition during the previously mentioned failure modes This data is sent in the configuration block see Image Table Mapping later in this chapter Device Actions Device actions include communication fault behavior idle state behavior input data behavior upon module removal Publication 1794 UM010B EN P March 2001 Input
63. put terminals Diagnostic Codes If an incomplete incorrect or conflicting set of configuration Returned by the Module parameters are sent to the module the PE bit is asserted the green module status indicator flashes and an error code is displayed in bits 0 11 of the module channel status word These codes are identified below Use a CIO instruction to access this information Diagnostics Reported in Word 8 of the Data Input File Read Word Indication Word 8 Bit 00 A reserved configuration or mode was programmed ZF BF AF were selected and no filter was programmed or multiple Bits 01 filters were selected Bits 02 A timebase was entered that was not a multiple of 10 or the timebase is out of range 3000 i e 3s A configuration requiring a timebase was selected and no gate Bit 03 interval was set or the gate interval is out of range 3s or the product of timebase and gate interval is greater than 3s A rollover of zero was programmed though PWM was not selected Bit 04 a rollover was programmed and PWM was selected or the rollover is out of range 1 rollover 16 777 216 Bit 05 The preset 0 preset 16 777 215 is out of range Publication 1794 UM010B EN P March 2001 Troubleshoot the Very High Speed Counter Module 5 3 Read Word Indication Bit 06 A configuration was selected that requires a scalar and no scalar was programmed or multiple scalars were selected Bit 07 A tie has been connected to an
64. put On State Voltage Input On State Current On State Voltage Maximum Input Frequency Maximum Input Filter Selections 2 2 groups of A A B B and Z Z pairs with 5V dc or 15 24V dc terminations 5V dc or 15 24V dc determined on terminal base terminations 5V dc terminations 19 1mA 9 5V dc 25 7mA 9 6V dc 15 24V dc terminations 6 1mA 15V dc 10 2mA 9 24V dc 5V dc terminations 1 25V dc 15 24V dc terminations 1 8V dc lt 0 250mA 5V dc terminations gt 2 6V dc 15 24V dc terminations gt 12 5V dc gt 5mA 5V dc terminations 6V 15 24V dc terminations Refer to 24V Input Derating curve below 1 0MHz counter and encoder X1 no filters 500kHz encoder X2 no filters 250kHz encoder X4 no filters 5 Off 10us 100us 1 0ms 10 0ms per A B Z group Specifications continued on the next page Publication 1794 UM010B EN P March 2001 A 2 Specifications Publication 1794 UM010B EN P March 2001 Specifications 1794 VHSC Very High Speed Counter Module Output Specifications Number of Outputs 2 isolated groups of 2 0 5A max 5V dc 1 0A max 12 24V dc Output Control Outputs can be tied to 8 compare windows Output Supply Voltage Range 5 7V dc 10 31V dc Off State Leakage Current 0 3mA On State Voltage Drop 5V dc terminations 0 9V dc 0 5A 12 24V dc terminations 0 9V dc 1 0A On State Current Maximum 5V dc terminations 0 5A 12 24V dc terminations 1 0A Maximum Current per
65. r of the unit to which you are connecting this terminal base unit 2 Check to make sure that the 16 pins in the male connector on the adjacent device are straight and in line so that the mating female connector on this terminal base unit will mate correctly 3 Position the terminal base on the 35 x 7 5mm DIN rail A A B pt no 199 DR1 Ilo pee ur Dt N aay zl Position terminal base at a slight angle and hooked over the top of the DIN rail 4 Make certain that the female flexbus connector C is fully retracted into the terminal base unit Publication 1794 UM010B EN P March 2001 How to Install Your Very High Speed Counter Module 2 5 2000000000000005 4 566 SSL OO OO0000 OOOO0O0000006 OO 666 Q000 c LEOCCOSCOSOOO Slide the terminal base unit over tight against the adapter Make sure the hook on the terminal base slides under the edge of the adapter and the flexbus connector is fully retracted Press down on the terminal base unit to lock the terminal base on the DIN rail If the terminal base does not lock into place use a screwdriver or similar device to open the locking tab press down on the terminal base until flush with the DIN rail and release the locking tab to lock the base in place 30077 M EEEE S M eee l22loooc COG Coe edoococooocooceES SO Gently
66. rs couper le courant ou s assurer que l emplacement est reconnu non dangereux Attacher tous connecteurs fournis par l utilisateur et reli s aux circuits externes d un appareil Allen Bradley l aide de vis loquets coulissants connecteurs filet s ou autres moyens permettant aux connexions de r sister une force de s paration de 15 newtons 3 4 Ib 1 5 kg appliqu e pendant au moins une minute Le sigle CSA est la marque d pos e de l Association des Standards pour le Canada PLC est une marque d pos e de Allen Bradley Company Inc Publication 1794 UM010B EN P March 2001 B 2 CSA Hazardous Location Approval Publication 1794 UM010B EN P March 2001 Numbers 1794 VHSC troubleshoot 5 1 A adapter input status word 4 3 C CE compliance 2 1 CIOs See ControlNet 1 0 Transfer instructions compatible terminal bases 2 9 connecting wiring 2 9 considerations pre installation 2 1 continuous rate mode 1 11 ControlNet 1 0 unscheduled non discrete 1 0 data transfer 4 2 unscheduled operations ladder rung messages 4 2 messaging from programming devices 4 2 peer to peer messaging 4 2 ControlNet I O Transfer CIO instructions 4 2 counter mode block diagram 1 3 operation 1 3 curent draw through base units 2 2 D daisy chaining wiring 2 3 diagnostics codes returned by module 5 2 DIN rail mounting 2 4 drilling dimensions wall panel mounting 2 7 E encoder phase relationship 1 5
67. rve below 24V dc nominal 19 2 to 31 2V dc includes 5 ac ripple 100mA 24V dc 0 to 55 C 32 to 131 F 40 to 85 C 40 to 185 F 5 to 95 noncondensing operating 5 to 80 noncondensing nonoperating 30g peak acceleration 11 1 ms pulse width 50g peak acceleration 11 1 ms pulse width Tested 5g 10 500Hz per IEC 68 2 6 12 gauge 4mm stranded maximum copper wire rated at 75 C or greater 3 64 inch 1 2mm insulation maximum 21 e CSA certified e CSA Class Division 2 Groups A B C D certified UL listed e UL Class Division 2 Groups A B C D certified CE marked for all applicable directives Publication 1794 UM010C EN P Publication 1794 IN067CJ EN P 1 Use this conductor category information for planning conductor routing Refer to publication 1770 4 1 Industrial Automation Wiring and Grounding Guidelines for Noise Immunity 24V Input Derating Curve On state Voltage V dc 0 10 20 5 30 40 50 Ambient Temperature C The area within the curve represents the safe operating range for the module under various conditions of user supplied 24V dc supply voltages and ambient temperatures This includes all possible mounting positions including inverted horizontal 55 60 Publication 1794 UM010B EN P March 2001 A 4 Specifications Publication 1794 UM010B EN P March 2001 Appendix B CSA Hazardous Location Approval CSA Hazardous Location Approval CSA certifies produc
68. set signal Note When flexbus power is lost communication to the PC is lost When LC 0 the module clears its OE bit at a loss of flexbus power Set this bit as appropriate in the safe state word since a communication fault Word 1 occurs after adapter power is lost 03 Not used set to 0 Output 1 Force output bit FO When set to 1 output is turned on if OE is 1 When FO 0 output can be controlled by a compare match or as directed by the PWM settings Output 1 Output enable bit OE When set to 1 output can be turned on from a force on compare match or as directed by the PWM settings When OE 0 the associated output is turned off Output 1 Local control bit LC When set to 1 output is controlled the counter if the flexbus power is lost i e the module detects a flexbus reset signal Note When flexbus power is lost communication to the PC is lost When LC 0 the module clears its OE bit at a loss of flexbus power Set this bit as appropriate in the safe state word since a communication fault occurs after adapter power is lost ce ce e Cc D Publication 1794 UM010B EN P March 2001 4 14 Input Output and Configuration Files for the Very High Speed Counter on ControlNet Output Word Definition 07 Not used set to 0 Output 2 Force output bit FO When set to 1 output is turned on if OE is 08 10 1 When FO 0 output can be controlled by a compare match or as directed by the PWM settings
69. tatus indicators 2 14 store count mode 1 1 mode 2 1 mode 3 1 mode 4 1 6 7 7 8 T terminal bases compatible 2 9 troubleshooting 5 1 U unscheduled non discrete 1 0 data transfer 4 2 W wall panel mounting 2 6 wiring methods of 2 3 wiring connections 2 9 1794 VHSC 2 12 Allen Bradley A B Publication Problem Report Wy If you find a problem with our documentation please complete and return this form Pub Name Very High Speed Counter Module User Manual al Check Problem s Type Describe Problem s Internal Use Only L Technical Accuracy L text L illustration Completeness procedure step illustration definition info in manual What information is missing example guideline feature accessibility L explanation L other L info not in manu Clarity What is unclear Sequence What is not in the right order L Other Comments Use back for more comments Your Name Location Phone Return to Marketing Communications Allen Bradley Co 1 Allen Bradley Drive Mayfield Hts OH 44124 6118 Phone 216 646 3176 FAX 216 646 4320 Publication ICCG 5 21 August 1995 PN 955107 82 PLEASE FASTEN HERE DO NOT STAPLE Other Comments PLEASE FOLD HERE Ete EA ie pes POSTAGE WILL BE PAID BY THE ADDRESSEE ON Rockwell Autom
70. ts for general use as well as for use in hazardous locations Actual CSA certification is indicated by the product label as shown below and not by statements in any user documentation Example of the CSA certification product label CL DIV 2 GP A B C D TEMP To comply with CSA certification for use in hazardous locations the following information becomes a part of the product literature for CSA certified Allen Bradley industrial control products This equipment is suitable for use in Class I Division 2 Groups A B C D or non hazardous locations only The products having the appropriate CSA markings that is Class Division 2 Groups A B C D are certified for use in other equipment where the suitability of combination that is application or use is determined by the CSA or the local inspection office having jurisdiction Important Due to the modular nature of a PLC control system the product with the highest temperature rating determines the overall temperature code rating of a PLC control system in a Class I Division 2 location The temperature code rating is marked on the product label as shown Temperature code rating CLI DIV 2 GP A B C D TEMP The following warnings apply to products having CSA certification for use in hazardous locations Look for temperature code rating here WARNING Explosion hazard Substitution of components may impair suitability for Class Divis
71. tting and can be computed as follows counts Scaler X 2 5E6 desired frequency for period rate and continuous rate counts time base X desired frequency for rate measurement Words 20 to 51 Safe State Values When the PLC transitions to PROG mode or a communication fault occurs the module copies the safe state words into its real time working buffer The definitions are identical to the those in the counter control word except entering a PWM Bits 00 15 safe state value outside the range 0 9500 results in a Hold Last State 00 17 Word 52 is Counter Control Safe State word 53 is Output Control Safe State word 54 is Channel 0 PWM Safe State word 55 is Channel 1 PWM Safe State Words 52 to 55 Publication 1794 UM010B EN P March 2001 What This Chapter Contains Status Indicators Chapter 5 Troubleshoot the Very High Speed Counter Module Use this chapter to troubleshoot the very high speed counter module by interpreting the indicators The module contains indicators for each of the following QS AB Flex LO AB Allen Bradley 1794 VHSC VERY HIGH SPEED COUNTER MODULE mn A Power status indicator indicates power applied to module and status of module B Insertable label for writing individual I O assignments C Status Indicators A Status of input A B Status of input B Z Status of gate input Z The indicators are multiplexed in 2 groups A0 BO Z0 O0 O1
72. ue at the time of the specified Z input event In PWM configuration it is the counter value at the end of the period specified by the product of the time base times gate interval In period rate and continuous rate it is the total accumulation of unscaled Z pulses i e if scaling is set to 128 the accumulator will increase by 128 counts The maximum frequency that accumulation can follow is 200Hz X Scaler value In rate measurement it is the total number of pulses seen at the A input accumulated over each period as specified by the product of time base times gate interval The range of values occupy the entire 32 bit size from 0 value 4 294 967 295 These words are not cleared by changing the configuration Module Channel Status Word 00 15 Word 6 00 17 00 15 Word 7 00 17 Words 8 02 03 05 Publication 1794 UM010B EN P March 2001 Zero input status bit ZS for Channel 0 This bit represents the present status of the Z input 0 Off 1 Input on This bit is uneffected by Z invert Zl in the counter configuration word Zero frequency detected bit ZF for Channel 0 Only used during frequency configurations period rate continuous rate and rate measurement In period rate and continuous rate counts are acquired during on state of the Z input At very low frequencies the counter saturates indicating a zero frequency detect The time it takes to determine a zero frequency in these 2 configurations can
73. und and an Installing the Very High Speed Counter Module explanation of the indicators on the module 3 Programming Your Very High Speed Counter Use RSLogics to program this module Module 4 Input Output and Configuration Files for the Very Identification and description of bit words for input High Speed Counter on ControlNet output and configuration 5 Troubleshoot the Very High Speed Counter Module Using the indicators for troubleshooting and diagnostic codes Specifications for the 1794 VHSC module CSA Hazardous Location Approval Approval criteria for the module Publication 1794 UM010B EN P March 2001 P 2 Using This Manual Related Products Product Compatibility Related Publications Publication 1794 UM010B EN P March 2001 You can install your input module in any system that uses Allen Bradley ControlNet programmable controllers and the 1794 I O structure Contact your nearest Allen Bradley office for more information about your programmable controllers This module can be used with 1794 ACNTS series B and ACNR15 series B or later ControlNet Adapters Communication between the module and the processor is bidirectional The PLC sends module information using ControlNet messages to the adapter The PLC receives module status information through ControlNet messages from the adapter For a list of publications with information on Allen Bradley programmable controller products consult our publication index SD4
74. urns on at 2000 and off at 5000 If the value in Counter ON Value is greater than the value in Counter OFF Value the output turns off at 2000 and on at 5000 Figure 1 11 Effect of Values in On Off Operation Output remains energized for 3000 additional counts Output turns ON Output turns OFF Output turns OFF Output turns ON at count of 5000 at count of 2000 at count of 5000 ALPOUT Or ARUN When values in Counter ON Value are less than When values in Counter ON Value are greater than values in Counter OFF Value values in Counter OFF Value 10687 1 Isolation of Outputs The module provides 850V dc isolation between each of the outputs and the flexbus Publication 1794 UM010B EN P March 2001 What the Very High Speed Counter Module Does Overview of the Very High Speed Counter Module 1 15 Connecting Outputs to Counters You can connect any of the outputs to any of the counter inputs In this way it is possible to use the outputs to reset a counter or to cascade counters If using the outputs this way make certain that the output voltage is compatible with the chosen input module interfaces with a FLEX I O family The very high speed counter module performs high speed scaling calculation operations for various industrial applications The ControlNet 1794 ACN15 series B or ACNRIS series B or later adapter which then communicates with a programmable controller processor The adapter power supply transf
75. ut Input Z filter bit ZF 0 not filtered 1 apply filter to input Setto 0 Time base Sets the fundamental time base for both counters Resolution in ms with a minimum of 10ms intervals 10ms 10 1s 1000 Time base must be entered when PWM and rate measurement are configured The maximum programmed value is 3000 Channel 0 Gate interval Sets the individual counter gate interval using the time base setting as its time unit Actual gate interval is time base X gate interval i e time base of 10 X gate interval of 5 50ms Maximum value is 3s Gate interval must be entered when PWM and rate measurement are configured Channel 1 Gate interval Sets the individual counter gate interval using the time base setting as its time unit Actual gate interval is time base X gate interval i e time base of 10 X gate interval of 5 50ms Maximum value is 3s Gate interval must be entered when PWM and rate measurement are configured Do not use reserved Channel 0 Rollover Sets the number of counts the counter accumulates before rolling over For example a setting of 1000 produces a count sequence of 998 999 0 1 2 while incrementing and 2 1 0 999 998 while decrementing Rollover is a 32 bit number with a usable range of 16 777 216 In PWM this value is zero in count X1 encoder X2 encoder and X4 encoder configurations it must be some specified nonzero number The value doesn t matter in period rate continuous rate
76. y Headquarters 1201 South Second Street Milwaukee WI 53204 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Publication 1794 UM010B EN P March 2001 Supersedes publication 1794 6 5 10 December 1998 Copyright 2001 Rockwell Automation Printed in USA

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