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1794-UM010C-EN-E FLEX I/O Very High Speed Counter Modules

1. pari Frequency input VHSC VHSC VHSC module module module module 200000000000000 0000000000000000 COODDDOOOOOOOOOO OODODOOOODOGG000 6000000000000000 00000000000000000 GSGGSGGSGGGSGGGGG OOGGHGSOOGOGGSGSG G POCOOCOCOOOOOCOOGG GGOOOOOOOOOOOOU Gl PPOODOOCOCOOCOOGG 00000000000000 UI ES l LH ES IU 24V DC Note Do not use any digital modules in this configurations Wiring when total current draw is less than 10 A Individual a Digital input VHSC Digital input Digital output vaa module module module module OOO OOO OOO OOO OOO OOO OOO l 000000000000000 0000000000000000 24V DC 24V DC l Note Use this configuration if using any digital output modules that could couple transients to the 24V supply 1794 VHSC module wiring separate from digital wiring Wiring when total current draw is greater than 10 A ATTENTION Take note of the following considerations when wiring A your terminal base units All modules must be frequency or analog modules for the daisychain configuration Use the individual type of configuration for any noisy DC digital 1 0 modules in your system All modules powered by the
2. 00 17 Actual gate interval is time base X gate interval for instance time base of 10 X gate interval of 5 50 ms Maximum value is 3 s Gate interval must be entered when PWM and rate measurement are configured Word 4 Bits 00 15 Channel 1 Gate interval Sets the individual counter gate interval using the time base setting as its time unit 00 17 Actual gate interval is time base X gate interval for instance time base of 10 X gate interval of 5 50 ms Maximum value is 3 s Gate interval must be entered when PWM and rate measurement are configured Word 5 Bits 00 15 Do not use reserved 00 17 Word 6 and 7 Bits 00 15 Channel 0 Rollover Sets the number of counts the counter accumulates before rolling over For example a setting 00 17 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 Word 8 and 9 Bits 00 15 Channel 1 Rollover Sets the number of counts the counter accumulates before rolling over For example a setting 00 17 of 1000 produces a count sequence of 998 999 0 1 2 while incrementing and 2 1 0 999 998 while decrementing
3. 6 Connect output power witing to terminals 37 and 39 for outputs 0 and 1 and terminals 46 and 48 for outputs 2 and 3 ATTENTION Use extreme care when connecting wiring to an A adjacent terminal base unit Wiring for the 1794 TB3G and 1794 TB3GS terminal base units is different from other 1794 terminal base units ATTENTION 24V DC power must be applied to your module before operation If power is not applied the module position will appear to the adapter as an empty slot in your chassis If the adapter does not recognize your module after installation is completed cycle power to the adapter ATTENTION Do not daisychain power or ground from the 1794 AN TB3G 1794 TB3GK or 1794 TB3GS terminal base unit to any AC or DC digital module terminal base unit Rockwell Automation Publication 1794 UM010D EN E July 2013 25 Install Your FLEX 1 0 VHSC Module 26 SISISISISISISISISISISIS S S S S Connections for Terminal Base 1794 TB3G or 1794 TB3GK shown A K B B Z Z 0O00 A A B B Z Z0 Lo L E E 24V inputs 24V inputs qe ey Chassis GND 5V inputs SV inputs Chassis GND SSSSSSSSSSISSSSISS S LRT base power base power Where A A incremental encoder input A 5 or 24V DC 45898 BB 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 o
4. Communicate With Your Module cant word cant word cant word cant word significant word significant word significant word significant word S E T T TT ae Y CG e e Pee lel b Tele ele GE Reserved Output Size a m Configuration Size 56 Words Counter Configuration Filter Selection Channel 0 PWM Output Value 0 95 00 Channel 1 PWM Output Value 0 95 00 EA ners E E T HS O K OO n O OO H E tao se Saara OOOO Rockwell Automation Publication 1794 UM010D EN E July 2013 Channel 1 Scaler 45903 ee H Tiara O aar O D ota REES EE EGE 35 Communicate With Your Module 36 Configuration Size continued 56 Words fo fofofo ofolofols s s si a ale rn ato fofofofofofofols s s si ml rale rn sto fofo o ofofojolsfs s is fale a N N N N ow r AION E E E First Counter 1st On Va First Counter 1st On Va First Count First Count First Counti First Counti First Counter 2nd Off Va ue most sig ue least sign er 1st Off Value least sign er 1st Off Value m er 2nd On Value le er 2nd On Value m OS as OS ue leas First Counter 2nd Off Value mos First Coun First Coun First Count First Coun First Coun First Count Second Co Second Co Second Co Second Coun Second Coun Second Cou Second Co First Counter 3rd On Value m First Counter 4th On Value mos e
5. Read Store Count and continue counting In mode 2 store wait resume see Figure Store Wait Resume on page 2 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 count is available in the Read Data file The stored count remains in the Read Data file until it is overwritten with new data Store Wait Resume Stop counting Store Count Resume counting In mode 3 store reset wait start see Figure Store Reset Wait Start on page 7 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 Store Reset Wait Start Counter has stopped counting Stop count store Start counting and reset to zero from zero In mode 4 store reset start see Figure Store Reset Start on page 8 on the rising edge of a pulse input at the
6. 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 s 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 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 5 MHz clock pulses over a user specified number of 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 5 MHz clock is counted the outputs dynamically track the 5 MHz count This allows you to turn an output on a certain number of 5 MHz counts after the gate reset pin goes active and turn it off a certain number of 5 MHz counts later 1794 VHSC module counts the total number of pulses occurring at the Z gate reset terminal This function is frequency limited to 200 Hz 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 Rockwell Automation Publication 1794 UM010D EN E July 2013 Incoming
7. X4 encoder PWM or the frequency in periodrate Word 1 00 5 continuousrate rate measurement The range of values is 00 17 0 lt value lt 16 777 215 Word 2 00 15 Channel 1 current count The current count consists of 2 words 32 00 17 bits representing the current count of the 24 bit counter in encoder X2 S encoder X4 encoder PWM or the frequency in period rate Word 3 00 5 continuous rate rate measurement The range of values is 00 17 0 lt value lt 16 777 215 Word 4 00 15 Channel 0 stored accumulated count These are 32 bit long word 00 17 values representing the stored count of the counter at the time of some S specified event Word 5 ob j py These words are not updated in counter modes counter X1 encoder X2 oe 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 n PWM configuration it is the counter value at the end of the period specified by the product of the time base times gate interval n period rate and continuous rate it is the total accumulation of unscaled Z pulses 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 n 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 imes gate interval The ra
8. 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 Block Diagram of Counter Mode on page 4 Rockwell Automation Publication 1794 UM010D EN E July 2013 3 Overview of the Very High Speed Counter Module Block Diagram of Counter Mode A Input A zi B Input B Z Store count Single phase pulse generator Gate Reset Input Z 1794 VHSC Count up Count down w LILI LE LI UL B input Count 2 3 2 1 0 Outputs updated continuously 45891 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
9. e Calculate the power requirements of all modules in the FLEX I O system and e Position the keyswitch on the terminal base Power Requirements 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 10 A ATTENTION Total current draw through the terminal base unit is limited to 10 A Separate power connections may be necessary Methods of wiring the terminal base units are shown in Wiring Information on page 23 Rockwell Automation Publication 1794 UM010D EN E July 2013 17 Install Your FLEX 1 0 VHSC Module Install the Module Installation of the module consists of e mount the terminal base unit e install the 1794 VHSC module into the terminal base unit e install the connecting wiring into the terminal base unit If you are installing your module into a terminal base unit that is already installed proceed to See Mount on a DIN Rail on page 18 Mount 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 Install the Terminal Base Unit 1 Remove the cover plug in the male connector 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
10. set to 0 2 14 ow 15 Output 3 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 3 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 15 17 Rockwell Automation Publication 1794 UM010D EN E July 2013 Output 3 Local control bit LC When set to 1 output is controlled the counter if the FlexBus power is lost for instance 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 Not used set to 0 41 Communicate With Your Module Bit Word Definitions Word 2 00 15 Channel 0 PWM Output value When the module is configured for 00 17 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 0 lt value lt 9500 decimal for instance 0 00 lt value lt 95 00 The actual duty cycle at the output depends on the tu
11. ROM checksum test failed 0 1 1 3 EEPROM test failed 1 0 0 4 Programmable Gate Array loading failed All other combinations not used Ch apter Summary This chapter described how to troubleshoot your adapter module by interpreting the status indicators and module channel status word error codes Rockwell Automation Publication 1794 UM010D EN E July 2013 49 Interpret Status Indicators for your FLEX 1 0 Module Notes 50 Rockwell Automation Publication 1794 UM010D EN E July 2013 Overview Appendix A Specifications This appendix contains general and environmental specifications and certifications for the FLEX I O Very High Speed Counter Module Input Specifications Attribute Number of input channels Value 2 groups of A A B B and Z Z pairs with 5V DC or Number of inputs per counter 15 24V DC terminations Input voltage 5V DC or 15 24V DC Determined by terminal base terminations Input current 5V DC terminations 19 1 mA 5V DC 25 7 mA 6V DC 15 24V DC terminations 6 1 mA 15V DC 10 2 mA 24V DC Voltage input off state 5V DC terminations lt 1 25V DC 15 24V DC terminations lt 1 8V DC Current input off state lt 0 25 mA Voltage input on state 5V DC terminations gt 2 6V DC 15 24V DC terminations gt 12 5V DC Current input on state gt 5 mA Voltage on state max 5V DC terminations 6V 15 24V DC terminations Refer
12. Very High Speed Counter Module 55 Communicate With Your Module 29 Interpret Status Indicators for your FLEX I O Module 47 Specifications 49 These documents contain additional information concerning related Rockwell Automation products Description A description and overview of the 1794 series FLEX 1 0 FLEX 1 0 XT and FLEX Ex modules and compatible control platforms Very High Speed Counter Module Installation Instructions nformation on installing the FLEX 1 0 Very High Speed Counter Module publication 1794 INO67 ControlLogix System User Manual publiation 1756 UM001 Detailed information on how to install configure and troubleshoot the ControlLogix module in your ControlLogix application EtherNet IP Modules Installation Instructions publication ENET IN002 nformation on installing EtherNet IP bridge modules FLEX I O DC Power Supply Installation Instructions publication 1794 INO69 nformation on how to install the FLEX 1 0 DC Power Supply Catalog No 1794 PS13 1794 PS3 EtherNet IP Modules in Logix5000 Control Systems User Manual Detailed information on how to use EtherNet IP modules with Logix5000 controllers publication ENET UM001 and communicate with various devices on the Ethernet network Rockwell Automation Publication 1794 UM010D EN E July 2013 v Preface Resource Description Industrial Automation Wiring and Grounding Guidelines Provides g
13. 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 an 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 output word 0 is reserved for special mode Enhancing Frequency Resolution To use this mode set bit 11 and set a value in output word 2 and or word 3 When the upper byte of word 0 is not zero the red module status indicator will flash and the TF bit is asserted to indicate the module has entered a test mode 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 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 Note To use Frequency Resolution Enhancement feature provides appropriate configuration for each frequency mode Mode 5 6 7 Firmware revision D changed decimal point placement to absolute positioning Revision D firmware also checks for placement to be in the range of 4 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 pre
14. cece cece cece cece een eeenaeenas 33 Input Data Behavior upon Module Removal 45 33 Frequency Resolution Enhancement 0 cee ee eens 33 Chapter Satara cits ual R Ra NR sone ewe TER os R S RT 45 Chapter 4 VY LVI CW TTT 47 Status Eidicators 2 2 clive ges hes fees bed a e Nts he MP oa 47 Diagnostic Codes Returned by the Module 00 0 005 48 S TTT 49 Appendix A ASV ELV A ATETEA AE AE hs Saari See Wi is rt tate Seer 51 Appendix B hE ihe fils dint SSN Ge AA ie GH Reis ay Soe Sa E Bao at OR as oa 55 EEE EAEE L EEEIEI RAE Sat PGE esas 57 Rockwell Automation Publication 1794 UMO010D EN E July 2013 Overview Module Description Chapter 1 Overview of the Very High Speed Counter Module This chapter gives you information on features of the modules how the module communicates with controllers and how the module operates Topic Page Module Description 1 Encoder or Counter Mode 2 Period Rate Mode 8 Continuous Rate Mode 10 Rate Measurement Mode He Pulse Width Modulation 12 Outputs 13 What the Module Does 14 The 1794 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 Ethernet capability The 1794 VHSC module once configured for its intended purpose can continue to operate without FlexBus power IMP
15. input signals count on the leading edge and the trailing edge of 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 Rockwell Automation Publication 1794 UM010D EN E July 2013 A input B input X1 count Quadrature encoder Gate Reset Input Z Forward rotation CCW encoder rotation Overview of the Very High Speed Counter Module 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 See Figure Phase Relationship for Forward or Reverse Directions on page 5 for the relationships between inputs A and B for forward and reverse directions in encoder applications Phase Relationship for Forward or Reverse Directions A Input A Z Store count 1794 VHSC Reverse rotation CW encoder rotation Jeo
16. of the Very High Speed Counter Module Effect of Values in On Off Operation Output remains energized for 3000 additional counts Output turns on at Output turns off at Output turns off at Output turns on at count value of 2000 count value of 5000 count value of 2000 count value of 5000 When values in Counter On Value are less than When values in Counter On Value are greater values in Counter Off Value than values in Counter Off Value Isolation of Outputs The module provides 850V DC isolation between each of the outputs and the FlexBus 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 What the Module Does The very high speed counter module performs high speed scaling calculation 14 operations for various industrial applications The module interfaces with a FLEX I O family EtherNet IP adapter which then communicates with a programmable controller processor The adapter power supply transfers data to and from the module over the FlexBus Instructions in the programmable controller facilitate this communication and let you write output values and configure the module s mode of operation Figure FLEX I O Communication Process on page 15 describes the communication process Rockwell Au
17. 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 modules 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 Period Rate Mode on page 9 shows a diagram of the module used in the period rate mode Rockwell Automation Publication 1794 UM010D EN E July 2013 Overview of the Very High Speed Counter Module Period Rate Mode A not used Input A B not used Input B Z gate reset Single phase pulse generator Input Z scaler 5 MHz clock 1794 VHSC Incoming pulse train at Z gate reset terminal 5 MHz internal clock L L 1 10 20 Accumulated count RE outputs Assumes symmetrical pulse 50 duty cycle so period sample time on X 2 on and off 45893 Frequency 1 period If count 25 scaler 1 and clock period 1 5 MHz Frequency 1 25 1 X 1 5 MHz X 2 100 KHz In Figure Period Rate Mode on page 9 the incoming pulse train from the gate reset terminal is used to sample pulses from t
18. row B for SV inputs terminals 17 22 and 25 30 on the terminal base unit Connect the input devices as shown in Table Wiring connections for the 1794 VHSC High Speed Counter Module on page 26 ATTENTION Do not connect 24V signals to the 5V input terminals Permanent damage to the module will result 2 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 Table Wiring connections for the 1794 VHSC High Speed Counter Module on page 26 3 Terminate shields to terminals 16 or 33 on row B or 40 45 on row C 24 Rockwell Automation Publication 1794 UM010D EN E July 2013 Install Your FLEX 1 0 VHSC Module 4 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 frequency A modules and digital modules from separate power supplies Do not exceed a length of 10 m 33 ft for DC power cabling 5 If daisychaining the 24V DC power to the next 1794 TB3G 1794 TB3GK or 1794 TB3GS 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 1794 TB3G 1794 TB3GK or 1794 TB3GS base unit
19. specified These windows are always interpreted as counts regardless of the configuration setting 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 52 55 Bits 00 15 Safe State Values When the PLC transitions to PROG mode or a communication fault occurs the module copies the 00 17 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 safe state value outside the range 0 9500 results in a Hold Last State 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 Ch apter Summary In this chapter you learned how to communicate with your module Read the next chapter to learn how to interpret the module LED status indicators Rockwell Automation Publication 1794 UM010D EN E July 2013 45 Communicate With Your Module 46 Rockwell Automation Publication 1794 UM010D EN E July 2013 Chapter 4 Interpret Status Indicators for your FLEX 1 0 Module Overview Use this chapter to troubleshoot the very high speed counter module by interpreting the indicators Status Indicators The module contains indicators for each of the following 1794 VHSC Module k Flex LO i ae Allen Bradley 1794 VHSC VERY HIGH SPEED C
20. status E NETWORK status Flexto O unk status lt COCQGOOG ia ZVO O00000 RRC C OO S OO COO QOOOGO Q000 QOSSOSEGS 45323 Terminal base unit not included 2 6 Self tapping screws 4 Adapter module not included To install the mounting plate on a wall or panel Lay out the required points on the wall or panel as shown in the Figure Drilling Dimensions for Panel or Wall Mounting on page 21 20 Rockwell Automation Publication 1794 UM010D EN E July 2013 Install Your FLEX 1 0 VHSC Module Drilling Dimensions for Panel or Wall Mounting 35 5 58 5 35 5 58 5 35 5 lt lt gt lt gt lt pe lai P lt Millimeters 1 4 23 1 4 23 aa i Inches F l 21 0 83 r PTE 1 TB pa 45327 8 Drill the necessary holes for the 6 self tapping mounting screws 9 Mount the mounting plate for the adapter module using two 6 self tapping screws 18 screws are 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 IN041 10 Hold the adapter at a slight angle and engage the top of the mounting plate in the indention on the rear of the adapter module 11 Press the adapter down flush with the panel until the locking lever locks 12 Position the ter
21. store reset wait start 1 0 0 Mdoe 4 store reset start Bit 15 17 Invert the Z signal 0 Z not inverted 1 Z inverted 42 Rockwell Automation Publication 1794 UM010D EN E July 2013 Communicate With Your Module Configuration Word Definition Configuration Bit Definition Word Word 1 Filter Selection Only 1 filter selection can be chosen at a time Frequency 50 duty cycle Bits 00 03 03 02 01 00 Counter 0 Bits 08 11 11 10 09 08 Counter 1 10 13 13 12 11 10 0 0 0 0 No filter 0 0 0 1 50 kHz 10 us 0 us 1 6 us 0 0 1 0 5 kHz 100 us 0 us 13 2 us 0 1 0 0 500 Hz 1 0 ms 0 ms 1 25 us 1 0 0 0 50 Hz 10 0 ms 0 ms 1 25 ms Bit 12 14 Input A filter bit AF 0 not filtered 1 apply filter to input Bit 13 15 Input B filter bit BF 0 not filtered 1 apply filter to input Bit 14 16 Input Z filter bit ZF 0 not filtered 1 apply filter to input Bit 15 17 Set to 0 Word 2 Bits 00 15 Time base Sets the fundamental time base for both counters Resolution in ms with a minimum of 10 ms intervals 00 17 10 ms 10 1 s 1000 Time base must be entered when PWM and rate measurement are configured The maximum programmed value is 3000 Word 3 Bits 00 15 Channel 0 Gate interval Sets the individual counter gate interval using the time base setting as its time unit
22. to 1 and module channel status contains error code e Hardware runtime failure that is watchdog timeout module communication ceases Flashing red e Module is configuring hardware NR is set to 1 e Module is in test mode bits 8 15 of counter control word are nonzero TF set to 1 Flashing red with occasional flashing green Module 24V power is below minimum rating Solid green Module is active and acting normally Flashing green e Module is not configured e Programming error PE is set to 1 and error code is supplied in bits 0 11 of module channel status word e Field power fault FP set to 1 e Adapter powered down and module local power still active e ControlNet cable disconnected e PLC in PROG mode Rockwell Automation Publication 1794 UM010D EN E July 2013 Interpret Status Indicators for your FLEX 1 0 Module Diagnostic Codes Returned Tran incomplete incorrect or conflicting set of configuration parameters are sent by the Module 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 Diagnostics Reported by Input Data Word 8 Read Word Word 8 Word Bit Indication 00 A reserved configuration or mode was programmed 01 ZF BF AF were selected and no filter was programmed or multipl
23. 24 bit counter overflows 2 384 Hz 05 2 32 Fmins frequency at which the 24 bit counter overflows 4 768 Hz 06 Z 64 Fmins frequency at which the 24 bit counter overflows 9 537 Hz 07 2 128 Fmins frequency at which the 24 bit counter overflows 19 073 Hz 44 Rockwell Automation Publication 1794 UM010D EN E July 2013 Communicate With Your Module Configuration Word Definition Configuration Bit Definition Word Words 16 19 Bits 00 Output Ties These bits connect the specified output to the appropriate compare window There are 8 windows 4 per 01 counter Each output can be connected to any number of windows from 1 to 8 02 F1 Tie output to first counter 1st window F2 Tie output to first counter 2nd window 05 F3 Tie output to first counter 3rd window 06 F4 Tie output to first counter 4th window 07 S1 Tie output to second counter 1st window S G S2 Tie output to second counter 2nd window pi S3 Tie output to second counter 3rd window S4 Tie ouput to second counter 4th window Set to 0 Words 20 51 Bits 00 15 Counter On and Off These words program each of the 4 counter s first and second counter on and off values The 00 17 first compare window for each counter is used in PWM and when programmed for PWM the associated compare window should remain at 0 The range of each entry is 0 lt value lt 16 777 215 When a tie is connected to a window comparator that window must be
24. 31 2V DC includes 5 AC ripple Supply current 100 mA 24V DC Dimensions HxWxD 94 x 94 x 69 mm with module installed on 3 7 x 3 7 x 2 7 in terminal base Isolation voltage 50V continuous Basic Insulation Type 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 02 03 and output power supply 2 Tested 850V DC for 1s FlexBus current 75 mA 5V DC with terminal base power off Power dissipation max 5 0 W 31 2V DC Thermal dissipation max 17 1 BTU hr 31 2V DC Indicators field side driven logic side indication 1 green red power status indicator 6 yellow input status indicators logic side 4 yellow output tatus indicators logic side Keyswitch position 1 Rockwell Automation Publication 1794 UM010D EN E July 2013 Specifications Environmental Specifications Attribute Temperature operating Value IEC 60068 2 1 Test Ad Operating Cold IEC 60068 2 2 Test Bd Operating Dry Heat IEC 60068 2 14 Test Nb Operating Thermal Shock 0 55 C 32 131 F Temperature nonoperating IEC 60068 2 1 Test Ab Un packaged Non operating Cold IEC 60068 2 2 Test Bb Un packaged Non operating Dry Heat IEC 60068 2 14 Test Na Un packaged Non operating Thermal Shock 40 85 C 40 185 F Relative humidity IEC 60068 2 30 Test Db Unpackaged Damp H
25. ORTANT 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 Ethernet Module Features The 1794 VHSC module counts pulses from encoders such as Allen Bradley Bulletin 845 pulse generators or mechanical limit switches or proximity switches and returns either a count or frequency in binary format Rockwell Automation Publication 1794 UM010D EN E July 2013 1 Overview of the Very High Speed Counter Module The module features include s 2 counters configurable for 3 encoder modes counter mode period rate mode continuous rate mode rate measurement and pulse width modulation PWM e 4 outputs isolated in pairs e outputs are current sourcing at 5 or 12 24V DC 0 5 mA max 5V 1 A max 12 24V s single ended or differential inputs e 2 phase encoder inputs up to a frequency of 250 KHz X 4 mode s single phase counter inputs up to a frequency of 1 MHz e input voltage range of 5 or 24V DC e returns input as count or frequency in binary format e input counts as high as 16 777 215 e upto 1 MHz in period rate or rate measurement frequency modes e outputs can be tied to any or all counter windows e each output has a user selectab
26. OUNTER MODULE m 45906 A 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 and A1 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 B Insertable label for writing individual I O assignments C Power status indicator indicates power applied to module and status of module Rockwell Automation Publication 1794 UM010D EN E July 2013 47 Interpret Status Indicators for your FLEX 1 0 Module Use the following table to determine the indicator conditions and status Status Indicator Identification Indicator State Status A status of input A Yellow Input A active Off Input A not active B status of input B Yellow Input B active Off Input B not active Z status of input Z Yellow Input Z active Off Input Z not active Out 0 1 2 3 Yellow Output is on Off Individual output is off When an active indicator yellow is lighted a valid signal active high or active low is present at the input terminals The module power status indicator OK shows power applied to the module and the status of the module Power Status Indicator Interpretation Indicator OK 48 State Solid red Status e Hardware diagnostic error TF set
27. 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 Word 10 and 11 Bits 00 15 Channel 0 Preset This word sets the preset value the counter is loaded with when CP is asserted This number has 00 17 a range of 0 lt value lt 16 777 216 Word 12 and 13 Bits 00 15 Channel 1 Preset This word sets the preset value the counter is loaded with when CP is asserted This number has 00 17 a range of 0 lt value lt 16 777 216 Rockwell Automation Publication 1794 UM010D EN E July 2013 43 Communicate With Your Module Configuration Word Definition Configuration Bit Definition Word Word 14 Bits 00 15 Channel 0 Scaler This word scales the Z signal in period rate and continuous rate modes If the filter is 00 17 applied the filtered Z signal is scaled Set only 1 bit of the Scaler Selecting a Scaler causes accumulated counts to be adjusted accordingly for instance selecting a 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 S
28. User Manual Allen Bradley 1794 FLEX I O Very High Speed Counter Module Catalog Numbers 1794 VHSC Allen Bradley Rockwell Software Automation Important User Information Solid state equipment has operational characteristics differing from those of electromechanical equipment Safety Guidelines for the Application Installation and Maintenance of Solid State Controls publication SGI 1 1 available from your local Rockwell Automation sales office or online at http www rockwellautomation com literature describes some important differences between solid state equipment and hard wired electromechanical devices Because of this difference and also because of the wide variety of uses for solid state equipment all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable In no event will Rockwell Automation Inc be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment The examples and diagrams in this manual are included solely for illustrative purposes Because of the many variables and requirements associated with any particular installation Rockwell Automation Inc cannot assume responsibility or liability for actual use based on the examples and diagrams No patent liability is assumed by Rockwell Automation Inc with respect to use of information circuits equipment or software described i
29. X2 count 10 12 X4 count a N The following paragraphs apply to both encoders and counters Rockwell Automation Publication 1794 UM010D EN E July 2013 5 Overview of the Very High Speed Counter Module Preset Value Each of the 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 and so on in a positive direction and from 1 0 359 358 and so on 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 For mor
30. 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 Rockwell Automation Publication 1794 UM010D EN E July 2013 7 Overview of the Very High Speed Counter Module Period Rate Mode is available in the Read Data file The stored count remains in the Read Data file until it is overwritten with new data Store Reset Start Rising edge Falling edge Store Count Store Count reset to zero reset to zero start counting start counting The figures show the store count feature operating on the rising edge of the gate reset pulse The user has the option of electing 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 5M Hz 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
31. 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 For more information Table 1794 VHSC High Speed Counter Module Image Table Mapping on page 35 Device Actions Device actions include e communication fault behavior e idle state behavior e input data behavior upon module removal 32 Rockwell Automation Publication 1794 UM010D EN E July 2013 Communicate With Your Module Communication Fault Behavior You can configure the 1794 VHSC response to a communication fault Upon detection of a communication fault the module can s leave the module output data in its last state hold last state s reset the module output data to zero reset e apply safe state data to the module output Idle State Behavior The 1794 VHSC module responds to idle state according to the Communication Fault Behavior described above The module can s leave the module output data in its last state hold last state e reset the module output data to zero reset e 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 s reset the module output data to zero reset s leave the module output data in the last state before module removal hold last state Frequency Resolution En
32. ata behavior 36 gate reset 10 install physically 21 installation 23 drilling 24 55 Index hazardous location 26 install connecting wiring 22 install module 21 mount terminal base 21 mounting kit 24 terminal base mounting 25 wall or panel mounting 24 K keyswitch 25 position 25 L location hazardous 26 male connector 22 messaging from programming devices 34 peer to peer 34 mode continuous rate 14 period rate 14 rate measurement 15 module installation 21 position 29 specifications 53 mounting kit 24 network EtherNet IP 21 0 operation unintended 22 output values 18 outputs connecting to counters 18 enabling 17 force 17 isolation 18 56 P panel mounting 24 power backplane 26 cabling 29 module 29 supply 29 S specification DIN rail 23 specifications certifications 56 derating curve 56 environmental 55 general 53 status indicator 49 54 T terminal base 22 24 26 27 28 29 36 grounding 29 replace 22 wiring 28 terminal base unit 28 U unscheduled messaging 34 operations 34 V value rollover 10 scaler 12 14 VHSC module wiring 28 W wiring 24 28 29 1794 TB3G 1794 TB3GS 1794 TB3GK 27 connect 29 connecting 22 frequency module 28 Rockwell Automation Publication 1794 UM010D EN E July 2013 Rockwell Automation Support Rockwell Automation provides technical information on the Web to assist you in using its products At hetp www rockwellautomation co
33. caler on the Z input 00 Z Fmins frequency at which the 24 bit counter overflows 0 149 Hz 01 Z 2 Fmins frequency at which the 24 bit counter overflows 0 298 Hz 02 2 4 Fmins frequency at which the 24 bit counter overflows 0 596 Hz 03 Z 8 Fmins frequency at which the 24 bit counter overflows 1 192 Hz 04 Z 16 Fmins frequency at which the 24 bit counter overflows 2 384 Hz 05 2 32 Fmins frequency at which the 24 bit counter overflows 4 768 Hz 06 Z 64 Fmins frequency at which the 24 bit counter overflows 9 537 Hz 07 2 128 Fmins frequency at which the 24 bit counter overflows 19 073 Hz Word 15 Bits 00 15 Channel 1 Scaler This word scales the Z signal in period rate and continuous rate modes If the filter is 00 17 applied the filtered Z signal is scaled Set only 1 bit of the Scaler Selecting a Scaler causes accumulated counts to be adjusted accordingly for instance selecting a 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 00 Z Fmins frequency at which the 24 bit counter overflows 0 149 Hz 01 Z 2 Fmins frequency at which the 24 bit counter overflows 0 298 Hz 02 2 4 Fmins frequency at which the 24 bit counter overflows 0 596 Hz 03 Z 8 Fmins frequency at which the 24 bit counter overflows 1 192 Hz 04 Z 16 Fmins frequency at which the
34. e filters were selected 02 A timebase was entered that was not a multiple of 10 or the timebase is out of range gt 3000 that is 3 s 03 A configuration requiring a timebase was selected and no gate interval was set or the gate interval is out of range gt 3 s or the product of timebase and gate interval is greater than 3 s 04 A rollover of zero was programmed through PWM was not selected a rollover was programmed and PWM was selected or the rollover is out of range 1 lt rollover lt 16 777 216 05 The preset 1 lt preset lt 16 777 216 is out of range 06 A configuration was selected that requires a scalar and no scalar was programmed or multiple scalars were selected 07 A tie has been connected to an unprogrammed window 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 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 10 Reserved 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 Error Code Definitions Read Word Bit 02 01 00 Dec Definition Word 8 00 07 0 0 1 1 RAM test failed 0 1 0 2
35. e 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 gate 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 In mode 1 store continue see Figure Store Continue on page 7 the leading edge of a pulse input on input Z gate reset terminal causes the current value in Rockwell Automation Publication 1794 UM010D EN E July 2013 Overview of the Very High Speed Counter Module 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 Store Continue
36. eat 5 95 non condensing Vibration IEC60068 2 6 Test Fc Operating 5g 10 500 Hz Shock operating IEC60068 2 27 Test Ea Unpackaged shock 30 g Shock nonoperating EC60068 2 27 Test Ea Unpackaged shock 50 g Emissions CISPR 11 Group 1 Class A with appropriate enclosure ESD Immunity IEC 61000 4 2 6 kV contact discharges 8 kV air discharges Radiated RF immunity IEC 61000 4 3 10V m with 1 kHz sine wave 80 AM from 80 2000 MHz 10V m with 200 Hz 50 Pulse 100 AM at 900 MHz 10V m with 200 Hz 50 Pulse 100 AM at 1890 MHz 10V m with 1 kHz sine wave 80 AM from 2000 2700 MHz EFT B immunity IEC 61000 4 4 2 kV 5 kHz on power ports 2 kV 5 kHz on signal ports Surge transient immunity IEC 61000 4 5 1 kV line line DM and 2 kV line earth CM on power ports 1 kV line line DM and 2 kV line earth CM on signal ports 2 kV line earth CM on shielded ports Conducted RF immunity IEC 61000 4 6 10V rms with 1 kHz sine wave 80 AM from 150 kHz 80 MHz Enclosure type rating None open style Wire size Determined by installed terminal base Wiring category 2 on signal ports 2 on power ports Terminal base screw torque Determined by installed terminal base DT Use this Conductor Category information for planning conductor routing Refer to Industrial Automation Wiring and Grounding Guidelines publication 1770 4 1 Roc
37. eneral guidelines for installing a Rockwell Automation industrial system publication 1770 IN041 Product Certifications website http ab com Provides declarations of conformity certificates and other certification details Application Considerations for Solid State Controls A description of important differences between solid state programmable controller publication SGI 1 1 products and hard wired electromechanical devices Allen Bradley Industrial Automation Glossary publication AG 7 1 A glossary of industrial automation terms and abbreviations You can view or download publications at http www rockwellautomation com literature To order paper copies of technical documentation contact your local Rockwell Automation distributor or sales representative Common Techniques Used The following conventions are used throughout this manual in this Manual s Bulleted lists such as this one provide information not procedural steps s Numbered lists provide sequential steps or hierarchical information s Italic type is used for emphasis vi Rockwell Automation Publication 1794 UM010D EN E July 2013 Summary of Changes Preface Overview of the Very High Speed Counter Module Install Your FLEX 1 0 VHSC Module Table of Contents New and Updated Information sees eee iii Who Should Use this Manual v Purpose of this Manual v Additional Resources 2 3 4 0 dieseled ainisarholoiadulhuetuaan ne bade v Common Techniqu
38. ential Wiring to a 1794 TB3G or 1794 TB3GK Terminal Base Unit Z Store count L Gate reset Quadrature encoder for example 845H SJ__24DRY__ Mechanical switch 1794 TB3G 24V Base power 45899 Solenoid ATTENTION Keep exposed area of inner conductor as short as possible gt Ch apter Summ ary This chapter provided you with instructions on how to install the module in an existing programmable controller system and how to wire to a terminal base unit 28 Rockwell Automation Publication 1794 UM010D EN E July 2013 Overview Communication Over the 1 0 Backplane 5 Chapter 3 Communicate With Your Module Read this chapter to familiarize yourself with configurable features on the 1794 VHSC Very High Speed Counter module For Information About See Page Communication Over the I O Backplane 29 1 0 Structure 31 Safe State Data 32 Device Actions 32 1794 VHSC High Speed Counter Module Image 35 Table Mapping Input Status Word Bits 32 Bit Word Definitions Re Configuration Word Definition 42 One 1794 AENT or 1794 AENTR EtherNet IP adapter can interface up to eight terminal 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
39. es Used in this Manual sese eee vi Chapter 1 OVERVIEW hihi ZARA T a poeta ah vend awe od hoe e eee iad a 1 Module Descriptions 27 tes ihe sea da Tre EE e asec aes 1 Module Features eee 1 Encoder or Counter Mode 7 Counter L HT 3 Pecoder Mode etd iica cakes A A Maan esuoe 4 Direction of Count Les ie contest pod Hacherso wnt ete Jat Raw ed coo 5 Preset Walk aN Aaa HR easel oun aU RA aS 6 Rollover Y altered S S Mie overs DETE sled see gee Bad ada 6 Software L aS anstey Maen eee Wek oak a het oie 6 Gate Reset lnpitt ss x Xa A ART a Aae beeen ermine DER hs 6 Peri d Rate MOG ani sr tud ota tutu awed adeo aoe eau delves 8 Operation of Scaler yi 0c234 iy 4a edad 10 Connection to Counter Inputs x e e e e e e e e cece eee eee 10 Continuous Rate Mode 10 Rate Measurement Mode cccccecccccceececuceseceees 11 Sample Pero dete as dvalt cers aiden clea tet sear a PE A G 12 Connection to Counter Inputs s e e e cece ee eee ees 12 Pulse Width Modulation xis aseizAa vase dre faced as Roa w ayer cece 12 OQ tp ts ees ania E Eai A E EEEE E RERED 13 Enabling and Forcing Qutputssxcadyvusdntnewcueuiedeswosinimens 13 Assigning Outputs to Counter Windows 000 0008 13 Operation of Oum x e cy ease vated see 13 Isolation of Outputs x x 14 Connecting Outputs to Counters 06 0 cece eee es 14 What the Module Does 14 Chapter SUMA sensoa Swe cane RUS EEO sania eel EREE 15 Chapter 2 OVERVIEW yk oh
40. g tab to lock the base in place D aras D mopute status D NETWORK status Pesto D unk status 45321 Gently push the FlexBus connector into the side of the adapter or proceeding terminal base to complete the backplane connection m amp O aas 8 H mopute status Network status Pesto Dunk status N eel a Rockwell Automation Publication 1794 UM010D EN E July 2013 19 Install Your FLEX 1 0 VHSC Module For specific wiring information refer to the installation instructions for the module you are installing in this terminal base unit 7 Repeat the above steps to install the next terminal base unit Ensure that the cover of the FlexBus connector on the last terminal base unit is in place Mount on a Panel or Wall Installation of a FLEX I O system on a wall or panel consists of e laying out the drilling points on the wall or panel e drilling the pilot holes for the mounting screws e mounting the adapter mounting plate e installing the terminal base units and securing them to the wall or panel Use the mounting kit Cat No 1794 NM1 for panel or wall mounting 1794 NM1 Mounting Kit Millimeters inches S Alien Bradiey 2 MODULE
41. hancement This mode is only for use in modules with firmware revision D or later Frequency Resolution Enhancement is a precise configuration which handles the decimal position adjustment to frequency count Using this mode allows the module to read the frequency up to two positions to the right or left of the decimal place For example a rounded frequency of 13 Hz can be displayed as 1257 or 12 57 The mode is only valid when the module is configured for Period Rate or Continuous Rate Frequency Resolution Enhancement reports the frequency back as a floating point value in a single word and allows configuration of decimal places of resolution The upper byte of the counter control word output word 0 is reserved for special mode Enhancing Frequency Resolution In this mode you can change significant digits of frequency display based on output word 2 for channel 0 and output word 3 for channel 1 Decimal point placement is absolute positioning 2 Rockwell Automation Publication 1794 UM010D EN E July 2013 33 Communicate With Your Module 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 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 occu
42. hange bars as shown to the right of this paragraph New and Upd ated This table contains the major changes and additions made to this revision Information Topic Page Updated Frequency Resolution Enhancement section 33 Updated Word 8 Bit Word Definitions 39 40 Rockwell Automation Publication 1794 UM010D EN E July 2013 iii Summary of Changes Notes iv Rockwell Automation Publication 1794 UM010D EN E July 2013 Who Should Use this Manual Purpose of this Manual Additional Resources Resource FLEX I O Selection Guide publication 1794 SG002 Preface Read this preface to familiarize yourself with the rest of the manual It provides information concerning e who should use this manual e the purpose of this manual e related documentation 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 This manual shows you how to use the FLEX I O Very High Speed Counter module with an Allen Bradley programmable controller It helps you install program and troubleshoot your module For Information About See Page I Overview of the Very High Speed Counter Module Install Your FLEX 1 0 VHSC Module 12 Programming Your
43. he 5 MHz internal clock As the frequency of the incoming pulse train at the gate reset terminal increases the number of sampled pulses from the 5 MHz 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 an accurate input frequency if incoming pulses have a 50 duty cycle Relationship Between Sampled Pulses and Input Frequency Input Frequency atZ Sampled Pulses for 1 2 Cycle ofZ Gate Reset Gate Reset Pulse Terminal in Hz 2 1 25M 5 500K 10 250K 20 125K 50 50K 100 25K Rockwell Automation Publication 1794 UM010D EN E July 2013 9 Overview of the Very High Speed Counter Module Continuous Rate Mode 10 Relationship Between Sampled Pulses and Input Frequency Input Frequency at Z Sampled Pulses for 1 2 Cycle of Z Gate Reset Gate Reset Pulse Terminal in Hz 200 12 5K 500 5K 1 KHz 2 5K 2 KHz 1 25k 5 KHz 500 10 KHz 250 20 KHz 125 50 KHz 50 100 KHz 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
44. heduled messaging Module I 0 Mapping The I O map for the 1794 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 modules 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 1794 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 ladder program for instance should monitor this error Rockwell Automation Publication 1794 UM010D EN E July 2013 Communicate With Your Module If the configuration is considered acceptable the counter application specific integrated circuit ASIC is disabled 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 ins
45. iguration Note You must place a value between 4 and 2 in output word 2 and or 3 to shift the decimal position accordingly 12 15 14 17 Reserved for factory use Word 1 00 15 00 17 Output Control Word 00 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 01 40 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 Rockwell Automation Publication 1794 UM010D EN E July 2013 Communicate With Your Module Bit Word Definitions 02 Output 0 Local control bit LC When set to 1 output is controlled the counter if the FlexBus power is lost for instance 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 03 Not used set to 0 04 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 05 06 Output 1 Output enable bit OE When se
46. ing 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 7 s 16 777 215 counts X 1 5 MHz 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 0 100 s gate interval 3 is 300 ms to determine ZF 06 07 Stored data count bit C0 C1 for Channel 1 This count cycles through 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 08 11 10 13 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 Rockwell Automation Publication 1794 UM010D EN E July 2013 Communicate With Your Module Definition 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
47. kwell Automation Publication 1794 UM010D EN E July 2013 51 Specifications Certifications Certification when Description product is marked 1 CE European Union 2004 108 EC EMC Directive compliant with EN 61326 1 Meas Control Lab Industrial Requirements EN 61000 6 2 Industrial Immunity EN 61000 6 4 Industrial Emissions EN 61131 2 Programmable Controllers Clause 8 Zone A amp B C Tick Australian Radiocommunications Act compliant with AS NZS CISPR 11 Industrial Emissions KC Korean Registration of Broadcasting and Communications Equipment compliant with Article 58 2 of Radio Waves Act Clause 3 UI See the Product Certification link at www ab com for Declarations of Conformity Certificates and other certification details Derating Curve 30 29 24 20 Input Voltage v 10 0 10 20 25 30 40 50 55 60 Ambient Temperature C 45907 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 52 Rockwell Automation Publication 1794 UM010D EN E July 2013 Appendix B Programming Your Very High Speed Counter Module To initiate communication between the 1794 VHSC very high speed counter module and your PLC processor you must use RS Logix 5000 software Refer to the RSLogix software manua
48. le on off value outputs can be tied back to an input for cascading e each counter has a user selectable preset and rollover value e totalization is provided in period rate continuous rate and rate measurement modes e module can continue counting without flexbus power after configuration e outputs have safe state values which can be applied when there is a network failure or the PLC is switched to PROGRAM mode e pulse width modulation PWM mode is available The 1794 VHSC module operates in the following modes e counter mode e encoder X1 mode e encoder X2 mode e encoder X4 mode e period rate mode e continuous rate mode e rate measurement frequency mode e pulse width modulation PWM Encoder or Counter Mode 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 2 Rockwell Automation Publication 1794 UM010D EN E July 2013 Overview of the Very High Speed Counter Module Use the encoder modes if you need the module to read incoming quadrature pulses and return them to the programmable controller as a binary number 0 16 777 215 In these modes the module accept
49. ls for information on communicating with this 1794 VHSC very high speed counter module Rockwell Automation Publication 1794 UM010D EN E July 2013 53 Programming Your Very High Speed Counter Module Notes 54 Rockwell Automation Publication 1794 UM010D EN E July 2013 Numerics 1794 TB3G 25 27 28 29 1794 TB3GK 27 28 29 1794 TB3GS 25 27 28 29 1794 VHSC 34 49 description 5 features 5 interpret status indicator 49 A adapter 21 23 24 25 29 1794 VHSC 21 capabilities 27 install 21 maximum capacity 27 additional resources 3 backplane 23 26 behavior communication fault 36 idle state 36 input data 36 C cabling length 29 power 29 chassis 28 29 codes diagnostic 51 error 51 compatible terminal base 28 configuration error 34 connect 28 connector 26 female 22 FlexBus 23 male 22 count scale 10 store 10 counter mode continuous 8 counters reset 10 Rockwell Automation Publication 1794 UM010D EN E July 2013 Index current draw 21 D daisychain 29 data transfer scheduled 34 unscheduled 34 definitions bit word 41 dimensions drilling 25 DIN rail 21 23 drilling illustration 25 E encoder mode X18 X2 8 X4 8 F female connector 22 FLEX 1 0 VHSC 27 FlexBus 18 22 23 24 26 connector 23 26 interruption 22 1 0 data transfer non discrete 34 1 0 map 34 1 0 module fault 36 fault bits 35 1 0 status 35 indicator state 50 status 50 indicators interpret 49 input d
50. m support you can find technical manuals a knowledge base of FAQs technical and application notes sample code and links to software service packs and a MySupport feature that you can customize to make the best use of these tools For an additional level of technical phone support for installation configuration and troubleshooting we offer TechConnect support programs For more information contact your local distributor or Rockwell Automation representative or visit http www rockwellautomation com support Installation Assistance If you experience a problem within the first 24 hours of installation review the information that is contained in this manual You can contact Customer Support for initial help in getting your product up and running United States or Canada 1 440 646 3434 Outside United States or Use the Worldwide Locator at http www rockwellautomation com support americas phone_en html or contact Canada your local Rockwell Automation representative New Product Satisfaction Return Rockwell Automation tests all of its products to ensure that they are fully operational when shipped from the manufacturing facility However if your product is not functioning and needs to be returned follow these procedures United States Contact your distributor You must provide a Customer Support case number call the phone number above to obtain one to your distributor to complete the return process Outside Uni
51. 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 Rockwell Automation Publication 1794 UM010D EN E July 2013 Outputs Overview of the Very High Speed Counter Module The 1794 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 24V DC You must connect an external power supply to each of the outputs The outputs can source 1 A DC alone or in combination The outputs are hardware driven and will turn on in about 25 s 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 9 and 13 see Figure 1794 VHSC High Speed Counter Module Image Table Mapping on page 35 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
52. minal base unit up against the adapter and push the female bus connector into the adapter 13 Secure to the wall with two 6 self tapping screws 14 Repeat for each remaining terminal base unit Mount the 1794 VHSC Module on the Terminal Base Unit The 1794 VHSC module mounts on a 1794 TB3G or 1794 TB3GS terminal base unit 1 Rotate keyswitch 3 on terminal base unit 4 clockwise to position 1 as required for the module Do not change the position of the keyswitch after wiring the terminal base unit Rockwell Automation Publication 1794 UM010D EN E July 2013 21 Install Your FLEX 1 0 VHSC Module FLEX 1 0 Terminal Base and Very High Speed Counter Parts Q SITET MUS i 8 P 7 40231 Label here or under here Description Description 1 FlexBus connector 5 Base unit 2 Latching mechanism 6 Alignment groove 3 Keyswitch 7 Alignment bar 4 Cap plug 8 Module 2 Make certain the FlexBus connector 1 is pushed all the way to the left to connect with the neighboring terminal base or adapter You cannot install the module unless the connector is fully extended 3 Make sure the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base unit ATTENTION If you remove or insert the module while the A backplane power is on an electrical arc can occur This could cause an explosion in haza
53. n this manual Reproduction of the contents of this manual in whole or in part without written permission of Rockwell Automation Inc is prohibited Throughout this manual when necessary we use notes to make you aware of safety considerations WARNING Identifies information about practices or circumstances that can cause an explosion in a hazardous environment which may lead to personal injury or death property damage or economic loss ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attentions help you identify a hazard avoid a hazard and recognize the consequence SHOCK HAZARD Labels may be on or inside the equipment for example a drive or motor to alert people that dangerous voltage may be present BURN HAZARD Labels may be on or inside the equipment for example a drive or motor to alert people that surfaces may reach dangerous temperatures PP gt IMPORTANT Identifies information that is critical for successful application and understanding of the product Allen Bradley Rockwell Automation FLEX I O ControlLogix RSlogix RSLinx and TechConnect are trademarks of Rockwell Automation Inc Trademarks not belonging to Rockwell Automation are property of their respective companies Summary of Changes This manual contains new and updated information Changes throughout this revision are marked by c
54. ncoming 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 in Figure Operation of the Rate Measurement Mode on page 12 Rockwell Automation Publication 1794 UM010D EN E July 2013 11 Overview of the Very High Speed Counter Module A Input pulse Internal sampling gate Accumulated count Pulse Width Modulation 12 Operation of the Rate Measurement Mode A Input Input A B not used Input B Z not used ane npu Encoder Pulse generator Gate Reset p Time base 1794 VHSC if 2 a i l Frequency calculated k Outputs updated here If sample period is 50 ms and count 3 then frequency 3 50 ms 60 Hz 45895 EXAMPLE In three counts have been accumulated during the user selected time period If you had selected 50 ms as the sample period the frequency returned to the programmable controller processor would be Frequency Counts Sample period 3 counts 50 ms 60 Hz Sample Period You can set the sample period used in the frequency calculation in the rate measurement mode Allowable values are 10 ms to 3 s in 10 ms increments The default value is 1 s Connection to Counter Inputs The only user connections used in the rate
55. ne kOe A bee AHS E Re ANB aiee dates 17 Before You Install Your Module 0 0 cece cece ce ceeeeences 17 Power Requirements x ee X S SS iseis nerki t or CTER EEEn EAA PERENE 17 Install the Module eee 17 Moiintons DUN ET E EA E E 18 Install the Terminal Base UnIE 18 Mount on a Panel or Wall 20 Rockwell Automation Publication 1794 UM010D EN E July 2013 vii Communicate With Your Module Interpret Status Indicators for your FLEX I 0 Module Specifications Programming Your Very High Speed Counter Module Index viii Mount the 1794 VHSC Module on the Terminal Base Unit 21 Wiring Informati n ereet rerepen t eE EE EEEE AE 23 Connect Wiring to the FLEX I O VHSC Input Module 24 Connect Wiring Using a 1794 TB3G 1794 TB3GK or 1794 TB3GS Terminal Base Unit cece eee cece ee enneees 24 Chapter Summary i a diet date sel ol Td E aR R Jaye OMe 28 Chapter 3 COV EVIE TTT 29 Communication Over the VO Backplane x ETRE Er AE Tare 29 Scheduled Data Transfer 0 cece cece cece cece eee eeeenas 30 Unscheduled Data Transfer 0 00 ccc e eee ee cece e eae 30 Module I O Mapping sse e 30 Application of New Configurations see e e e eee ee eee 30 O Structure oe 2 Sores a A Aaa hraa ibook 31 Adapter Input Status Word 31 SARE A D EIE EA E AE E E E EE 32 Perce Actiones L E O Re a R toa 32 Communication Fault Behavior 0 ce eee eee eee e eee 33 Idle State Behavior 0
56. nge of values occupy the entire 32 bit size rom 0 lt value lt 4 294 967 295 These words are not cleared by changing the configuration Word 6 00 15 Channel 1 stored accumulated count These are 32 bit long word 00 17 values representing the stored count of the counter at the time of some specified event Word 7 GS a These words are not updated in counter modes counter X1 encoder X2 Rockwell Automation Publication 1794 UM010D EN E July 2013 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 n PWM configuration it is the counter value at the end of the period specified by the product of the time base times gate interval n period rate and continuous rate it is the total accumulation of unscaled Z pulses 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 nrate 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 imes gate interval The range of values occupy the entire 32 bit size rom 0 lt value lt 4 294 967 295 These words are not cleared by changing the configuration 37 Communicate With Your Module Bit Word Definitions Input Word Word 8 38 Bit Definition Module Channel Status Word 00 Zero input s
57. one or more controllers or scanners and or programming terminals over the EtherNet IP network The adapter communicates with its I O modules over the backplane EtherNet IP Adapter 1 0 Module 1 0 Module 1 0 Module 0 Inputs Inputs Inputs Read Read Words Status Status Status eee t Outputs Outputs Outputs Write Write S l Words y l l l Configuration Configuration Configuration Slot 0 Slot 1 Slot 7 45900 Data is exchanged scheduled when mapped or unscheduled using EtherNet IP instructions Rockwell Automation Publication 1794 UM010D EN E July 2013 29 Communicate With Your Module 30 Scheduled Data Transfer Scheduled data transfer e is continuous e is asynchronous to the ladder logic program scan e occurs at the actual rate displayed in the Actual Packet Interval field on the programming software I O mapping monitor screen Unscheduled Data Transfer Unscheduled operations include e unscheduled non discrete I O data transfers through I O transfer instructions e peer to peer messaging through Message MSG instructions e messaging from programming devices Unscheduled messaging on an EtherNet IP network is non deterministic Your application and your configuration number of nodes application program NUT amount of scheduled bandwidth used and so on determine how much time there is for unsc
58. ord Bits on page 32 Input Status Word Bits Bit Description Bit Explanation 1 0 Module Fault 0 This bit is set 1 when an error is detected in slot position 0 1 This bit is set 1 when an error is detected in slot position 1 2 This bit is set 1 when an error is detected in slot position 2 3 This bit is set 1 when an error is detected in slot position 3 4 This bit is set 1 when an error is detected in slot position 4 5 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 7 This bit is set 1 when an error is detected in slot position 7 Node address 8 This bit is set 1 when the node address switch setting is changed changed since power up 0 state g Bit 0 idle Bit 1 run 10 15 Not used set to 0 Possible causes for an I O module fault are e transmission errors on the FLEX I O backplane e a failed module e a module removed from its terminal base e an incorrect module inserted in a slot position e an empty slot e anon discrete module in the slot Safe State Data The EtherNet IP 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 1794 VHSC module and may be defined using configuration software Safe state data assures that a known output will be
59. pulse train at Z gate reset terminal 5 MHz internal clock Accumulated count Overview of the Very High Speed Counter Module Period Rate and Continuous Rate Output Operation with Scaler of 1 A not used Input A E B not used Input B Z Gate Reset Encoder Pulse generator Input Z scaler 5 MHz clock 1794 VHSC 0 20 Frequency updated here Outputs updated continuously 45894 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 5 MHz Frequency 1 25 1 X 1 5 MHz X 2 100 KHz Rate Measurement Mode Use the rate measurement mode to count incoming pulses for a 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 i
60. r 1 Power up the FLEX chassis or put the controller 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 enhanced 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 34 Rockwell Automation Publication 1794 UM010D EN E July 2013 1794 VHSC High Speed Counter Module Image Table Mapping Input Size 1 9 Words 7 1 0 Image Channel 0 Current Co Channel 0 Current Co Channel 1 Current Co Ch annel 1 Current Co unt least signifi unt most signifi unt least signifi Channel 0 Stored Accumulated Count leas Channel Channel 1 Channel 0 Stored Accumula 1 Stored Accumula ed Count mos Stored Accumulated Count leas ed Count mos unt most signifi
61. r 3rd On Value least signi OS sig sig sig er 3rd Off Value least signi er 3rd Off Value mos er 4th On Value le er 4th Off Value least sig er 4th Off Value mos unter 1st On Value unter 1st On Value unter 1st Off Value nter 1st Off Value nter 2nd On Value er 2nd On Value er 2nd Off Val Second Coun Second Coun Second Cou Second Co Second Co Second Co Second Co nter 2nd Off Value nter 3rd On Value unter 3rd On Value unter 3rd Off Value unter 3rd Off Value unter 4th On Val unter 4th On Val os ificant word nificant word ificant word nificant word nificant word nificant word ificant word ificant word ificant word icant word icant word nificant word nificant word nificant word nificant word nificant word ignificant word ignificant word ignificant word nt word nt word word word nt word word word word nt word word word 45904 Rockwell Automation Publication 1794 UM010D EN E July 2013 Communicate With Your Module Bit Word Definitions Input Word Bit Definition Word 0 00 15 Channel 0 current count The current count consists of 2 words 32 00 17 bits representing the current count of the 24 bit counter in encoder X2 encoder
62. rdous location installations Be sure that power is removed or the area is nonhazardous before proceeding 4 Position the module 8 with its alignment bar 7 aligned with the groove 6 on the terminal base 5 Press firmly and evenly to seat the module in the terminal base unit The module is seated when the latching mechanism is locked into the module 6 Remove cap plug and attach another terminal base unit to the right of this terminal base unit if required Make sure the last terminal base has the cap plug in place 22 Rockwell Automation Publication 1794 UM010D EN E July 2013 Install Your FLEX 1 0 VHSC Module IMPORTANT The adapter is capable of addressing eight modules Do not exceed a maximum of eight terminal base units in your system Wiring Information This section provides essential wiring information for the 1794 TB3G 1794 TB3GK and 1794 TB3GS terminal base units It also includes instructions for connecting wiring to the FLEX I O module Wire the Terminal Base Units 1794 TB3G shown Daisy chaining
63. rn on and turn off times of the MOSFET energy storage capability of the cable load and the resistance from output to return Word 3 00 15 Channel 1 PWM Output value When the module is configured for 00 17 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 0 lt value lt 9500 decimal for instance 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 Configuration Word Definition Configuration Bit Definition Word Configuration Counter Configuration The upper byte of this word configures counter 1 the lower byte configures counter 0 TRE Bits00 03 03 loz or Joo Counterd Bits 08 11 11 10 09 08 Counter 1 10 13 13 12 11 10 0 0 0 0 Counter 0 0 0 1 Encoder 0 0 1 0 Encoder X2 0 0 1 1 PWM 0 1 0 0 Encoder X4 0 1 0 1 Period Rate 0 1 1 0 Continuous Rate 0 1 1 1 Rate Measurement Mode Selection Bits 04 07 06 05 04 Counter 0 Bits 12 14 14 13 12 Counter 1 14 16 16 15 14 0 0 0 Store count disabled 0 0 1 Mode 1 store continue 0 1 0 Mode 2 store wait resume 0 1 1 Mode 3
64. s Word Bits on page 32 39 Communicate With Your Module Bit Word Definitions Output Bit Word Definition Word 0 00 15 00 17 Counter Control Word 00 Channel 0 Counter reset bit CR A 0 to 1 transition of this bi clears the counter Outputs are adjusted according to the window compare values 01 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 02 Channel 0 Value reset bit VR A 0 to 1 transition of this bit clears the stored accumulated count words 03 This bit is always 0 04 Channel 1 Counter reset bit CR A 0 to 1 transition of this bi clears the counter Outputs are adjusted according to the window compare values 05 Channel 1 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 06 07 Channel 1 Value reset bit VR A 0 to 1 transition of this bit clears the stored accumulated count words This bit is always 0 08 10 10 12 11 13 Reserved for factory use Frequency Resolution enhancement bit M11 Set this bit to 1 for frequency precision configuration Refer to Word 8 Bit Word Definitions on page 39 for details on frequency precision conf
65. s two phase quadrature feedback and counts up or down depending upon the condition of the phase B input for each counter The operation of the module in the encoder counter modes is as follows e 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 e encoder X1 This is a bidirectional count mode counting up or down using quadrature input signals e encoder X2 This is a bidirectional count mode using quadrature input signals with 2 times the resolution of X1 e 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 e 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 Counter Mode Direction Phase B Input Count direction High Down Low or floating not included Up The module reads incoming pulses from a maximum of 2 encoders single ended or differential
66. same power supply must be frequency or analog modules for the combination type of configuration 24V DC 45897 Wiring the FLEX I O VHSC Input module is done using the 1794 TB3G 1794 TB3GK or the 1794 T B3GS terminal base unit Rockwell Automation Publication 1794 UM010D EN E July 2013 23 Install Your FLEX 1 0 VHSC Module 1794 TB3G 1794 TB3GK and 1794 TB3GS Wiring Connections 1794 TB3GS Oy Bt T E E n S28 AO 12 ts R L T L 7 1794 TB3G or 1794 TB3GK Joa Soe ecu ka a D O 012 3 4 5 6 7 8 9 10 11 12 13 14 15 Label placed at top of wiring area FARRAR AR ARR RR AR RAR FARRAR ARRR RAR RRR RRR AAR RAR RAP RR RAR RRA 34 and 50 24V DC 35 and 51 common 35 and 51 common 34 and 50 24V DC 16 and 33 chassis 16 and 33 chassis ground 40 45 chassis ground 40 45 chassis ground 45928 Connect Wiring to the FLEX 1 0 VHSC Input Module Wiring to the 1794 VHSC Input module is made through the terminal base unit on which the module mounts The module is compatible with the 1794 TB3G 1794 TB3GK and 1794 TB3GS terminal base units Connect Wiring Using a 1794 TB3G 1794 TB3GK or 1794 TB3GS Terminal Base Unit 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
67. sent 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 1 Hz and 0 01 Hz Do not use scalars of Z 128 2 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 and the green indicator momentarily turns on the 24V DC power is below the module minimum Bit Word Definitions Input Word Bit Word 8 12 14 13 15 14 16 15 17 Rockwell Automation Publication 1794 UM010D EN E July 2013 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 Table Input Statu
68. t 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 for instance 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 07 08 10 Not used set to 0 Output 2 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 09 11 Output 2 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 10 12 Output 2 Local control bit LC When set to 1 output is controlled the counter if the FlexBus power is lost for instance 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 1 13 Not used
69. talled I O modules The Output data for 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 EtherNet IP adapter Read Data Adapter Status Slot 0 Input Data Network READ Slot 1 Input Data Slot7 Input Data Read HO Module 1O Module _____ 1O Module Write Data Write Slot 0 Slot 1 Slot 7 Adapter Status Slot 0 Output Data Slot 1 Output Data Slot 7 Output Data 45901 Adapter Input Status Word The input status word consists of s I O module fault bits 1 status bit for each slot e node address changed 1 bit e I O status 1 bit 1 0 Module Fault Bits Bitt 15 14 13 12 11 10 9 8 Slot 7 Slot 6 gt Slot 5 Slot 4 gt Slot 3 Slot 2 Slot 1 gt Slot 0 Not used Node Address Changed Bit _4 Created by controller Node Address Changed Bit 45902 Rockwell Automation Publication 1794 UM010D EN E July 2013 31 Communicate With Your Module The adapter input status word bit descriptions are show in Table Input Status W
70. tatus 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 ZI in the counter configuration word 01 02 03 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 be as long as 6 7 s 16 777 215 counts X 1 5 MHz 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 300 ms to determine ZF Stored data count bit C0 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 04 Zero input status bit ZS for Channel 1 This bit represents the present status of the Z input 0 Off 1 Input on 05 Zero frequency detected bit ZF for Channel 1 Only used dur
71. ted States Please contact your local Rockwell Automation representative for the return procedure Documentation Feedback Your comments will help us serve your documentation needs better If you have any suggestions on how to improve this document complete this form publication RA DU002 available at http www rockwellautomation com literature Rockwell Otomasyon Ticaret A Kar Plaza Is Merkezi E Blok Kat 6 34752 erenk y stanbul Tel 90 216 5698400 www rockwellautomation com Power Control and Information Solutions Headquarters Americas Rockwell Automation 1201 South Second Street Milwaukee WI 53204 2496 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Europe Middle East Africa Rockwell Automation NV Pegasus Park De Kleetlaan 12a 1831 Diegem Belgium Tel 32 2 663 0600 Fax 32 2 663 0640 Asia Pacific Rockwell Automation Level 14 Core F Cyberport 3 100 Cyberport Road Hong Kong Tel 852 2887 4788 Fax 852 2508 1846 Rockwell Automation Publication 1794 UM010D EN E July 2013 Copyright 2013 Rockwell Automation Inc All rights reserved
72. the module 3 The module converts these signals into binary format and stores these values and controls their output until the adapter requests their transfer 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 EtherNet IP transfers the data to the programmable controller data table In this chapter you learned how your module operates and how your module communicates with the programmable controller Rockwell Automation Publication 1794 UM010D EN E July 2013 15 Overview of the Very High Speed Counter Module Notes 16 Rockwell Automation Publication 1794 UM010D EN E July 2013 Overview Before You Install Your Module Chapter 2 Install Your FLEX 1 0 VHSC Module This chapter describes how to physically install the 1794 VHSC adapter on the DIN rail and connect it to the EtherNet IP network Topic Page Before You Install Your Module 17 Power Requirements 17 Install the Module 18 Mount on a DIN Rail 18 Mount on a Panel or Wall 20 kak Mount the 1794 VHSC Module on the Terminal Base 2 Unit Wiring Information 23 Connect Wiring to the FLEX 1 0 VHSC Input Module 124 Connect Wiring Using a 1794 TB3G 1794 TB3GK or 124 1794 TB3GS Terminal Base Unit Before installing your 1794 VHSC very high speed counter module you need to
73. this terminal base unit will mate correctly S Allen Bradley C MODULE status O NETWORK status O unk status 18 UTU a GOETH ee Creare Q GEOCCOOG ele GESCOCCCOSOCCOSOSS KKO O OOO 45319 HGHG Make certain that the female FlexBus connector is fully retracted into the base unit Rockwell Automation Publication 1794 UM010D EN E July 2013 Install Your FLEX 1 0 VHSC Module 3 Position the terminal base at a slight angle and hooked over the top of the 35 x 7 5 mm DIN rail A Allen Bradley part number 199 DR1 46277 3 a ee D mooute starus E einen status T uncstarus 45320 4 Slide the terminal base over tight against the adapter or proceeding terminal base Make sure the hook on the terminal base slides under the edge of the adapter or proceeding terminal base and the FlexBus connector is fully retracted 5 Pivot the terminal base onto the DIN rail with the top of the rail hooked under the lip on the rear of the terminal base Use caution to make sure that the female FlexBus connector does not strike any of the pins in the mating male connector 6 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 lockin
74. 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 Operation of Outputs When the outputs for the 1794 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 see Figure On Off Operation of Output on page 13 On Off Operation of Output Output remains energized for 3000 additional counts Output turns onat Output turns off at count value of 2000 count value of 5000 Using output 0 as an example when the value in Counter ON Value is less than the value in Counter OFF Value the output turns 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 see Figure Effect of Values in On Off Operation on page 14 Rockwell Automation Publication 1794 UM010D EN E July 2013 13 Overview
75. to Derating Curve Input frequency max 1 0 MHz counter and encoder X1 no filters 500 kHz encoder X2 no filters 250 kHz endocer X4 no filters Input filter selections Output Specifications Attribute Number of outputs Off 10us 100p1s 1 0ms 10 0ms per A B Z group Value 2 isolated groups of 2 0 5A 5V DC max 1 0A 12 24V DC max Output control Outputs can be tied to 8 compare windows Voltage range output supply 5 7V DC 10 31V DC Leakage current off state Less than 300 pA Voltage drop on state Rockwell Automation Publication 1794 UM010D EN E July 2013 5V DC terminations 0 9V DC 0 5A 12 24V DC terminations 0 9V DC 1 0 A 49 Specifications 50 Output Specifications Attribute Current on state max Value 5V DC terminations 0 5 A 12 24V DC terminations 1 0 A Current per output pair max 5V DC terminations 0 5 A 12 24V DC terminations 1 0 A Short circuit current 5V DC terminations 0 94 12 24V DC terminations 4 0A Outputs are short circuit protected and turned off until power is cycled Surge current 2A for 50 ms repeatable every 2 s Delay Time Off to On On to Off General Specifications 25 us load dependent 150 us load dependent Attribute Value Module location 1794 TB3G and 1794 TB3GS External DC power supply 24V DC voltage range nom Supply voltage 19 2
76. tomation Publication 1794 UM010D EN E July 2013 Overview of the Very High Speed Counter Module The adapter transfers your configuration FLEX 1 0 Communication Process Q data to the module FlexBus The adapter transfers the data over the FlexBus kad Allen Bradley C moute status Zo C NETWORK STATUS C unk status EtherNet IP 10100 ETHERNET ADAPTER IP ADDRESS SUBNET MASK D com TTT TT UU IUAMIT senet avbREss 00 00 80 06 00 37 A 2 N Ethe prog The adapter and module determine that the transfer was made without error and input values are within a specified range rNet IP transfers the data to the rammable controller data table External devices transmit frequency signals to the module eee FITO wy Allen Bradley 1794 VHSC me VERY HIGH SPEED COUNTERMODUL mma i O ok LC QOOOOQOOQOO00000 QOOOGOOQOOOOOGOOO OOOODDGOOGOOOO000 L The module converts frequency signals into binary format and stores these values until the adapter requests their transfer 45896 1 The adapter transfers your configuration data and commands to the module 2 External devices generate input signals that are transmitted to
77. utputs 1 A max V negative isolated power connection 1 A 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 Wiring connections for the 1794 VHSC High Speed Counter Module Incremental Terminal Base Units 1794 TB3G 1794 TB3GK _ Encoder Input 1794 TB3GS Channel 0 Channel 1 24V Inputs Input A 0 8 Input A 1 9 Input B 2 10 Input B 3 11 Input Z 4 12 Input Z 5 13 5V Inputs Channel 0 Channel 1 Input A 17 25 Input A 18 26 Input B 19 27 Rockwell Automation Publication 1794 UM010D EN E July 2013 Install Your FLEX 1 0 VHSC Module Wiring connections for the 1794 VHSC High Speed Counter Module Input B 20 28 Input Z 21 29 Input Z 22 30 Outputs Output Sourcing Out Return Output Sourcing Out Return 00 6 23 01 7 24 02 14 31 03 15 32 24V DC Terminals 34 and 50 Base power 24V DC COM Terminals 35 and 51 5V or 24V Terminals 37 and 46 Output power V Output power Terminals 39 and 48 Chassis GND Terminals 16 33 and 40 45 ATTENTION Total current draw through the terminal base unit is A limited to 10 A Separate power connections to the terminal base unit may be necessary Rockwell Automation Publication 1794 UM010D EN E July 2013 27 Install Your FLEX 1 0 VHSC Module Example of Quadrature Encoder Differ

1794-UM010C-EN-E FLEX I/O Very High Speed Counter Modules

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