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.
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...
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.
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 = ?), •...
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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...
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).
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.
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...
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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...
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;...
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.
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.
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.
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;...
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 -...
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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.
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.
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...
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1-14 About the Very High Speed Counter Modules Publication 1734-UM003A-EN-P - August 2000...
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.
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.
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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...
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.
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...
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...
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...
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...
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 ≤...
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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.
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.
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.
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...
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.
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.
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…...
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.
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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...
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...
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.
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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.
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.
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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.
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,”...
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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.
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Configuring Your Very High Speed Counter Module Publication 1734-UM003A-EN-P - August 2000...
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.
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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.
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. •...
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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...
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...
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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.
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...
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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...
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...
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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...
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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...
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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...
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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...
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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...
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