Allen-Bradley 1734-VHSC5 User Manual
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Allen-Bradley 1734-VHSC5 User Manual

Very high speed counter module
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Very High Speed
Counter Module
Cat. No. 1734-VHSC5 and -VHSC24
User Manual

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  • Page 1 Very High Speed Counter Module Cat. No. 1734-VHSC5 and -VHSC24 User Manual...

  • Page 2: Important User Information

    Since there are many variables and requirements associated with any particular installation, Allen-Bradley does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.

  • Page 3: Purpose Of This Manual

    Preface Purpose of This Manual This manual describes how to install, configure and troubleshoot your Very High Speed Counter module. For Information about: See: About the Very High Speed Counter Chapter 1 Modules Installing the Very High Speed Counter Chapter 2 Module Very High Speed Counter Module Input and Chapter 3...

  • Page 4: European Communities (Ec) Directive Compliance

    Voltage, by applying the safety requirements of EN 61131-2 Programmable Controllers, Part 2 - Equipment Requirements and Tests. For specific information required by EN 61131-2, see the appropriate sections in this publication, as well as Allen-Bradley publication 1770-4.1, Industrial Automation Wiring and Grounding Guidelines.

  • Page 5: Definitions

    Preface Definitions The following define the intended operation of the Very High Speed counter module. Lead Breakage Typically requires a shunt resistor (across the load) to detect 3 levels of current/input states - • Open (Wire Off, Device = ?), •...
  • Page 6 Preface Operational Mode Zero Frequency Input Monitored Detection Counter None Encoder None Period/Rate Z Only Continuous/Rate Z Only Rate Measurement A Only None Publication 1734-UM003A-EN-P - August 2000...

  • Page 7: Table Of Contents

    Table of Contents Important User Information ....... 2 Preface Purpose of This Manual ....... . P-1 Who Should Use This Manual .
  • Page 8 1734-VHSC5.........

  • Page 9: General

    Chapter About the Very High Speed Counter Modules General In this chapter, you will learn about the types of very high speed counters, their features and capabilities. Introducing the Very High Module Overview Speed Counter Modules The counter modules install into the Point I/O terminal base (1734-TB or -TBS) and interface with the Point I/O DeviceNet Pass-through (1734-PDN) or the Point I/O DeviceNet Adapter (1734-ADN).

  • Page 10: Operating Modes

    About the Very High Speed Counter Modules The 1734-VHSC has 2 outputs that access customer power from the PointBus to facilitate various output device’s voltage requirements. The outputs are rated to source 0.5A at 10 to 28.8V dc. The output may be tied to an input.

  • Page 11: Encoder Modes

    About the Very High Speed Counter Modules [B = High, Count = Down; B = Low or floating (not connected), Count = Up] The Channel B input may be tied high or low for unidirectional counting, or toggled for bidirectional counting. EXAMPLE Example of Counter Mode A Input...
  • Page 12 About the Very High Speed Counter Modules Absolute encoders typically have higher speed requirements (200 KHz typical) for motion control applications. An absolute encoder has a unique code associated with each position, so the exact position is always known, even if the system power is turned off. EXAMPLE Example of Multiplying Encoder Mode X1, X2 and X4 Input A...

  • Page 13: Period/Rate Mode

    About the Very High Speed Counter Modules X4 Multiplying Encoder Mode Quadrature input signals are used to count on leading AND trailing edges of A AND B for a bidirectional count, and channel B is used to determine the direction. [ B = leads A, Count = Down;...

  • Page 14: Operation Of Scalar

    About the Very High Speed Counter Modules As the frequency of the incoming pulse train at the Z (Gate/Reset) terminal increases, the number of sampled pulses from the 5MHz clock decreases. Since accuracy is related to the number of pulses received over the sample period, the accuracy will decrease with increasing frequencies at the Gate/Reset terminal.

  • Page 15: Continuous/Rate Mode

    About the Very High Speed Counter Modules Continuous/Rate Mode The Continuous/Rate Mode will return an incoming frequency and a total accumulated count to PointBus, by gating an internal 5MHz internal clock with an external signal. Similar to the Period/Rate mode except outputs in this mode are updated continuously.

  • Page 16: Rate Measurement Mode

    About the Very High Speed Counter Modules Rate Measurement Mode The Rate Measurement mode determines the frequency and total number of input pulses over a user-specified sample period. At the end of the interval, the module returns a value representing the sampled number of pulses and a value indicating the incoming frequency.

  • Page 17: New Data Indicator

    About the Very High Speed Counter Modules New Data Indicator A two bit counter, C1 & C0, is updated every time an "event" occurs, indicating that new data is available in the Stored/Accumulated Count words. Events are defined as: Any active gate transition in any of the Store Count (Counter or Encoder) modes;...

  • Page 18: Operating Mode Features

    1-10 About the Very High Speed Counter Modules Operating Mode Features The following table summarizes which features are active in each mode: Operating Feature Counter Encoder Period Continuous Rate Up / Down X1, X2 & X4 /Rate /Rate Measurement Preset Rollover Software Reset Store Count -...
  • Page 19 About the Very High Speed Counter Modules 1-11 Store Count Mode 2: Store/Wait/Resume In mode 2, the rising edge of a pulse input on the Z Gate/Reset terminal will read and store the current counter value in the Stored/ Accumulated Count word and inhibit counting while the Z Gate/Reset terminal is high.

  • Page 20: Output Control

    1-12 About the Very High Speed Counter Modules Store Count Mode 4: Store-Reset/Start In mode 4, the rising edge of a pulse input on the Z Gate/Reset terminal will store the current counter value in the Stored/ Accumulated Count word and reset the counter to zero. The counter will continue counting while the Z Gate/Reset terminal is high.

  • Page 21: Chapter Summary

    About the Very High Speed Counter Modules 1-13 Effect of ON-OFF Value on Output Operation Effect of ON-OFF Value on Output Operation Output remains Energized Output remains Deenergized for 3000 additional counts for 3000 additional counts Output turns ON Output turns OFF Output turns OFF Output turns ON at count of 2000...
  • Page 22 1-14 About the Very High Speed Counter Modules Publication 1734-UM003A-EN-P - August 2000...

  • Page 23: General

    Chapter Installing the Very High Speed Counter Module General The 1734-VHSC is a two-module set. Module 1 houses the 1734-VHSC functionality while module 2 provides screw terminals necessary to access chassis ground (Chas Gnd) and common (C). Module 2 also connects terminal 4 to 5 and terminal 6 to 7 for ease of wiring power to the input device.

  • Page 24: Installing An I/O Module

    Installing the Very High Speed Counter Module Slide-in Writable Label Module Locking Mechanism Insertable I/O Module Module Wiring Diagram Mechanical Keying (orange) RTB Removing Handle DIN Rail Locking Screw (orange) Removable Terminal Block (RTB) Interlocking Side Pieces Mounting Base 3. Press firmly to seat the mounting base on the DIN rail. The mounting base will snap into place.
  • Page 25 Turn the keyswitch to align 1734-VHSC24 - Position 2 the number with the notch. 1734-VHSC5 - Position 2 Notch (position 3 shown) 2. Make certain the DIN rail Make sure the DIN rail...

  • Page 26: Installing The Removable Terminal Block

    Installing the Very High Speed Counter Module Installing the Removable Terminal A removable terminal block is supplied with your mounting base Block assembly. To remove, pull up on the RTB handle. This allows the base to be removed and replaced as necessary without removing any of the wiring.

  • Page 27: Wiring The 24V Dc Very High Speed Counter Module

    Installing the Very High Speed Counter Module Wiring the 24V dc Very High Speed Counter Module Module Status Network Status Status of Input A Status of Input B Status of Input Z Status of Output 0 Status of Output 1 Input A Input A Chassis...

  • Page 28: Chapter Summary

    Installing the Very High Speed Counter Module Chapter Summary In this chapter, you learned how to install your module and mounting base assembly. You also learned how to wire your module. Publication 1734-UM003A-EN-P - August 2000...

  • Page 29: In This Chapter

    Chapter Very High Speed Counter Module Input and Output Data In This Chapter In this chapter, you will learn about the input/output data table of your 1734-VHSC24 and -VHSC5. For more information about: See page: Data Table Detailed Description of Data Table Information Output Data Configuration Data Communicating Real Time/Non-real Time Information...

  • Page 30: Stored/Accumulated Channel Data (Input Word 2)

    Very High Speed Counter Module Input and Output Data Scalar 8-bit value used to divide the Z input by 2 Output Ties 0 Output Ties 1 Rollover Value 32-bit value at which the counter is commanded to rollover Preset Value 32-bit value the counter is to be set to when CP is asserted On Value 1 32-bit value that sets the compare window...

  • Page 31: Module/Channel Status And Programming Error Codes

    Very High Speed Counter Module Input and Output Data rate measurement [7] configuration, it is the total number of pulses seen at the A input accumulated over each period as specified by the product of the time base x gate interval. The range of values occupy the entire 32 bit size from 0 ≤...
  • Page 32 Very High Speed Counter Module Input and Output Data EEPROM Fault status bit (EF) - If a fault is detected with the EEPROM during power up tests, this bit is asserted to 1. It indicates that the content of the EEPROM has been corrupted, most likely caused by loss of power during an executing write.

  • Page 33: Output Data

    Very High Speed Counter Module Input and Output Data Output Data Counter Control (Word 1) Value Reset of stored/accumulated count. The transition of this bit from 0 to 1 clears the stored/accumulated count word. Counter Preset. The transition of this bit from 0 to 1 sets the counter to the value specified by the Preset words.

  • Page 34: Pulse Width Modulation (Pwm) Value (Output Word 3)

    Very High Speed Counter Module Input and Output Data Pulse Width Modulation (PWM) Value (Output Word 3) When the module is programmed for a PWM [3] configuration, the time base is enabled, the counter, rollover the 1 ON and 1 value for the respective channel are used.

  • Page 35: Filter Selection (Configuration Word 2)

    Very High Speed Counter Module Input and Output Data Filter Selection (Configuration Word 2) This byte sets the A/B/Z input filters Filter Selection No Filter 50kHz (10µs + 0µs/-1.6µs) 5kHz (100µs + 0µs/-13.2µs) 500Hz (1.0ms + 0µs/-125µs) 50Hz (10ms + 0ms/-1.25ms) A input not filtered A input filtered B input not filtered...

  • Page 36: Active Output Assembly (Configuration Word 4)

    Very High Speed Counter Module Input and Output Data In the counter modes (counter [0], x1 encoder [1], x2 encoder [2], pwm [3], x4 encoder [4]), it attenuates the counter display, for example, 20 divides count+1 by 20. The value may be in the range 0 < value ≤ 255. The result of requesting a number other than 1 performs the function: (COUNT + 1) / ATTENUATION.

  • Page 37: Scalar (Configuration Word 7)

    Very High Speed Counter Module Input and Output Data Scalar (Configuration Word 7) This byte scales the Z signal in the period/rate [5] and continuous/rate [6] configurations. If the filter is applied, then the filtered Z is scaled. Only one bit of the scalar should be set. Selecting a scalar will cause accumulated counts to be adjusted accordingly (i.e.

  • Page 38: Rollover (Configuration Word 10)

    3-10 Very High Speed Counter Module Input and Output Data Rollover (Configuration Word 10) This long word sets the number of counts the counter will accumulate before rolling over. For example, a value of 1000 will produce a count sequence of: 998, 999, 0, 1, 2… while incrementing or 2, 1, 0, 999, 998…...

  • Page 39: Safe State Values (Configuration Words 20 Through 22)

    Very High Speed Counter Module Input and Output Data 3-11 Safe State Values (Configuration Words 20 through 22) When either the host transitions to PROGRAM mode or a communication fault (i.e. broken network cable) occurs, the module copies these safe state words (counter control, output control, and PWM value) into its real-time working buffer.
  • Page 40 3-12 Very High Speed Counter Module Input and Output Data #108 (0x6c) Set/Get Counter Configuration Filter Selection Decimal Position Active Output Assembly Time Base or PWM Period Gate Interval Scalar Output 0 Ties Output 1 Ties Rollover Value Preset Value ON Value # 1 OFF Value #1 ON Value # 2...

  • Page 41: Configuration Overview

    Chapter Configuring Your Very High Speed Counter Module This chapter describes how to configure your Very High Speed Counter modules with RSNetworx. For more information about: See page: Configuration Overview Adding the Adapter to Your Network Adding I/O Modules to Your Network Setting the Counter’s Parameters Checking I/O Status and Viewing/Editing the EDS File...

  • Page 42: Adding I/O Modules To Your Network

    Configuring Your Very High Speed Counter Module 2. Add the communication device as shown below. (In this case, the chosen device was a 1770-KFD RS232 Interface.) The scanner appears 1. Click here to expand the list on the network. of communication adapters. 2.
  • Page 43 Configuring Your Very High Speed Counter Module If you commission a node online, you must power IMPORTANT down your system before the change takes place. 1. Go to the pulldown Tools. Select Node Commissioning. 2. Click on Browse. 3. Select the module to change. 4.

  • Page 44: Setting The Counter's Parameters

    The tabs are shown below and on the following pages. These screens are for the 1734-VHSC24 module. Identical screens are used for the 1734-VHSC5 module These are the tabs you click on to view the options.
  • Page 45 Configuring Your Very High Speed Counter Module Click on the Device parameters tab The module’s name appears to get to the screen for setting the here. parameters. Type a description here. The module’s address appears here. (This field is read only.) This screen also shows the At any point, you can click here to finish module’s device identity.

  • Page 46: Checking I/O Status And Viewing/Editing The Eds File

    Configuring Your Very High Speed Counter Module To configure your module, select Configuration and modify the parameters as desired for your application. When complete, download to your module by clicking on the Download to Device button. You can download each change as you make it using “Single,”...
  • Page 47 Configuring Your Very High Speed Counter Module Click on the EDS File tab to display the statistics of the EDS file used to configure this Click on View File to view the actual EDS file (shown at the left). You can view the actual EDS file or edit the file.
  • Page 48 Configuring Your Very High Speed Counter Module Publication 1734-UM003A-EN-P - August 2000...

  • Page 49: In This Chapter

    Chapter Accessing Instantiated Instances In This Chapter In this chapter, you will learn how to access imbedded Instantiated Instances (assemblies) in the software. The Very High Speed Counter Module uses several words to communicate real time input and output data as well as non-real time module information (i.e. description, revision, etc) and configuration.
  • Page 50 Accessing Instantiated Instances The Class Instance Attribute editor screen will appear. 1. Select the service code 3. Enter the class, instance and attribute here. 4. Click on Execute to initiate the action. 2. Select the Receive Data size and radix. For example: If you select Instance 101 (polled connection), the screen will look like this.

  • Page 51: Assemblies

    Accessing Instantiated Instances Assemblies Available assemblies are: • Assembly 101 is produced for a polled connection. • Assembly 102 is produced for a Change Of State (COS) connection. • Assemblies 103, 104, 107 and 108 are by Explicit message only. •...
  • Page 52 Accessing Instantiated Instances #108 (0x6c) Set/Get Counter Configuration Filter Selection Decimal Position Active Output Assembly Time Base or PWM Period Gate Interval Scalar Output 0 Ties Output 1 Ties Rollover Value Preset Value ON Value # 1 OFF Value #1 ON Value # 2 OFF Value #2 ON Value # 3...

  • Page 53: Using The Indicators For Troubleshooting

    Chapter Troubleshooting with the Indicators Using the Indicators for Each 1734-VHSC very high speed counter module has 7 indicators on the frontplate. Use these indicators for troubleshooting. Troubleshooting Module Status Network Status Status of Input A Status of Input B Status of Input Z Status of Output 0 Status of Output 1...
  • Page 54 Troubleshooting with the Indicators Indication Probable Cause Network Status Device is not on-line - Device has not completed dup_MAC_id test. - Device not powered - check module status indicator Flashing Green Device is on-line but has no connections in the established state.

  • Page 55: Specifications For The Very High Speed Counter Module, Cat. No

    Appendix Specifications Specifications for the Very Specifications - 1734-VHSC24 Very High Speed Counter Module High Speed Counter Input Specifications Module, cat. no. Number of Inputs 1 - 1 group of A/Areturn, B/Breturn and Z/Zreturn Input Voltage 15-24V dc 1734-VHSC24 Input Current 6.1mA @ 15V dc 10.2mA @ 24V dc Input OFF-State Current...
  • Page 56 Specifications General Specifications Module Location 1734-TB, -TBS, -TB3, -TB3S wiring base assembly Keyswitch Position Pointbus Current 180mA maximum Power Dissipation 1.9W maximum @ rated load Thermal Dissipation 6.5 BTU/hr maximum @ rated load Isolation Voltage (minimum) Prequalified for 1250V ac/rms between: Module 1 System side (PointBus) Chassis ground...

  • Page 57: Input Derating Curve For 1734-Vhsc24

    Module Ambient Still Air Temperature (°C) Note: Exceeding the maximum input voltage can cause permanent damage to the input. Specifications for the Very High Speed Counter Specifications - 1734-VHSC5 Very High Speed Counter Module Input Specifications Module, cat. no. Number of Inputs...
  • Page 58 Specifications General Specifications Module Location 1734-TB, -TBS, -TB3, -TB3S wiring base assembly Keyswitch Position Pointbus Current 180mA maximum Power Dissipation 1.5W maximum @ rated load Thermal Dissipation 5.1 BTU/hr maximum @ rated load Isolation Voltage (minimum) Prequalified at 1250V ac/rms between: Module 1 System side Chassis ground...
  • Page 59 Index 1-10 active features per mode indicators 3-8, 3-11 assembly selection input status indicator input voltage range input word - present channel data installation - module base assembly, mounting installation - wiring base assembly installation, module installation, removable terminal block CE directives checking I/O defaults class instance attribute editor...
  • Page 60 3-10 PWM mode setting the preset value PWM timebase selection specifications - 1734-VHSC5 specifications for the 1734-VHSC24 stored/accumulated channel data rate measurement mode rate measurement mode operation 3-10 rollover configuration...
  • Page 61 What is unclear? Sequence What is not in the right order? Other Comments Use back for more comments. Your Name Location/Phone Return to: Marketing Communications, Allen-Bradley., 1 Allen-Bradley Drive, Mayfield Hts., OH 44124-6118Phone:(440) 646-3176 FAX:(440) 646-4320 Publication ICCG-5.21- August 1995 PN 955107-82...
  • Page 62 PLEASE FASTEN HERE (DO NOT STAPLE) Other Comments PLEASE FOLD HERE NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST-CLASS MAIL PERMIT NO. 18235 CLEVELAND OH POSTAGE WILL BE PAID BY THE ADDRESSEE 1 ALLEN-BRADLEY DR MAYFIELD HEIGHTS OH 44124-9705...
  • Page 64 Back Cover Publication 1734-UM003A-EN-P - August 2000 PN 957293-30 © 2000 Rockwell International Corporation. Printed in the U.S.A.

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