Allen-Bradley POINT I/O 1734-VHSC5 User manual

Very High-Speed
Counter Modules
1734-VHSC5 and 1734-VHSC24
User Manual

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://literature.rockwellautomation.com) 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 in 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.
POINT I/O, POINTBus, and RSLogix 5000 are trademarks of Rockwell Automation.
ControlNet is a trademark of ControlNet International, Ltd. DeviceNet is a trademark of Open DeviceNet Vendor Association, Inc.
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.
IMPORTANT Identifies information that is critical for successful
application and understanding of the product.
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
•recognize the consequence
SHOCK HAZARD
Labels may be located on or inside the equipment (for
example, drive or motor) to alert people that dangerous
voltage may be present.
BURN HAZARD Labels may be located on or inside the equipment (for
example, drive or motor) to alert people that surfaces may
be dangerous temperatures.

1Publication 1734-UM003B-EN-P - August 2005
Summary of Changes
Summary of Changes
This publication contains new and revised information not in the last
release.
New and Revised Information
See the table for a summary of the major changes in this manual.
Change Bars
We marked with change bars (as shown with this paragraph) the areas
in this manual that differ from previous editions and indicate the
addition of new or revised information.
Chapter Change
Preface Update of list of publications
Indication that for specifications and safety approval information
refer to the installation instructions
2 Addition of Before You Begin section
Addition of attention and warning statements
Appendix A Update on how to configure modules in RSLogix 5000 software

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Summary of Changes 2
Notes:

vPublication 1734-UM003B-EN-P - August 2005
Table of Contents
Preface
Preface
Purpose of This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . P-1
Related Products and Documentation. . . . . . . . . . . . . . . . . P-1
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-3
Chapter 1
About the Modules
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 1-1
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Counter Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Encoder Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Period/Rate Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Operation of Scalar . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Rate Measurement Mode . . . . . . . . . . . . . . . . . . . . . . . 1-7
New Data Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Default Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Operating Mode Features . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Chapter 2
Install the Modules
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 2-1
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Install the Mounting Base Assembly. . . . . . . . . . . . . . . . . . 2-1
Install an I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Install the Removable Terminal Block . . . . . . . . . . . . . . . . 2-4
Remove a Mounting Base . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Wire the Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Chapter 3
Input and Output Data
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 3-1
Data Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Detailed Description of Data Table Information . . . . . . . . . 3-2
Stored/Accumulated Channel Data (Input Word 2) . . . . 3-2
Module/Channel Status and Programming Error Codes
(Input Words 3 and 4) . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

vi Publication 1734-UM003B-EN-P - August 2005
Configuration Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Counter Configuration (Configuration Word 1) . . . . . . . 3-5
Filter Selection (Configuration Word 2 . . . . . . . . . . . . . 3-5
Decimal Position (Configuration Word 3) . . . . . . . . . . . 3-6
Word 4 is reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Time Base and Gate Interval (Configuration Words
5 and 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Scalar (Configuration Word 7) . . . . . . . . . . . . . . . . . . . 3-7
Scalar Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Rollover (Configuration Word 8). . . . . . . . . . . . . . . . . . 3-7
Preset (Configuration Word 9) . . . . . . . . . . . . . . . . . . . 3-7
Safe State Values (Configuration Word 10) . . . . . . . . . . 3-8
Communicate Real Time and Nonreal Time Information. . . 3-8
Chapter 4
Configure Your Module
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 4-1
Configuration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Add the Adapter to Your Network . . . . . . . . . . . . . . . . 4-1
Add I/O Modules to Your Network. . . . . . . . . . . . . . . . 4-2
Set Counter Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Check I/O Status and View/Edit the EDS File. . . . . . . . . . . 4-6
Chapter 5
Access Instantiated Instances
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 5-1
Use Instantiated Instances . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Chapter 6
Troubleshoot with the Indicators
Use the Indicators for Troubleshooting . . . . . . . . . . . . . . . 6-1
Appendix A
Configure Modules in
RSLogix 5000
What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . A-1
Understand Data, Connection, and Communication Formats A-1
Configure Your Module. . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Use the Help Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Work with the Fault/Program Action Dialog. . . . . . . . . . . . A-4
Work with the Counter Configuration Dialog . . . . . . . . . . . A-6
Work with the Output Configuration Dialog. . . . . . . . . . . A-10
Index

1Publication 1734-UM003B-EN-P - August 2005
Preface
Purpose of This Manual
Read this manual for information about how to install, configure, and
troubleshoot your module.
Who Should Use This
Manual
You must be able to use RSNetWorx software or similar configuration
software to set up and calibrate these modules. You must have the
capability to download and use Electronic Data Sheet files.
We assume you know how to do this in this manual. If you do not,
refer to your software user manuals or online help before attempting
to use these modules.
For This Information See
About the Modules Chapter 1
Install the Modules Chapter 2
Input and Output Data Chapter 3
Configure Your Module Chapter 4
Access Instantiated Instances Chapter 5
Troubleshoot with the Indicators Chapter 6

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Preface 2
Related Products and
Documentation
For specification, safety approval, and other information refer to the
following.
•Publication Number 1734-IN003
5V and 24V Very High-speed Counter Modules
Installation Instructions
For related 1734 products and documentation see the table.
Description Cat. No. Publication
Analog Input Modules
Installation Instructions 1734-IE2C 17340IE2V 1734-IN027
Analog Output Modules
Installation Instructions 1734-OE2C 1734-OE2V 1734-IN002
DeviceNet Communication Interface
Installation Instructions 1734-PDN 1734-IN057
Field Potential Distributor
Installation Instructions 1734-FPD 1734-IN059
POINT I/O 24V dc Expansion Power Supply
Installation Instructions 1734-EP24DC 1734-IN058
POINT I/O Selection Guide 1734 series 1734-SG001
Protected Output Module s
Installation Instructions 1734-OB2E 1734-OB4E
1734-OB8E
1734-IN056
Relay Output Modules
Installation Instructions 1734-OW2 1734-OW4 1734-IN055
Sink Input Modules
Installation Instructions 1734-IB2 1734-IB4
1734-IB8
1734-IN051
Source Output Modules
Installation Instructions 1734-IV2 1734-IV4
1734-IV8
1734-IN052
Wiring Base Assembly
Installation Instructions 1734-TB 1734-TBS 1734-IN511
Wiring Base Assembly
Installation Instructions 1734-TB3 1734-TB3S 1734-IN013

Publication 1734-UM003B-EN-P - August 2005
Preface 3
Definitions
The following define the intended operation of the module.
Term Definition
Lead Breakage Typically requires a shunt resistor (across the load) to detect
3 levels of current/input states -
•Open (Wire Off, Device = ?)
•Off (Wire OK, Device Off)
•On (Wire OK, Device On)
This method does not check the input against a time base,
only that the device wiring (current loop) is intact.
Missing Pulse Typically usesan inputpulsetoresetawatchdogtimer(fixed
or programmable HW). This method does detect Lead
Breakage, since a broken wire will time-out the watchdog.
Zero Frequency Typically uses an input pulse to calculate an input frequency
and verify it is above an error threshold. This method does
detect Lead Breakage, since a broken wire will generate a
0Hz frequency.
Missing Pulse or Zero Frequency will also detect a customer
devicestuckhighorlow,sincethecounterismonitoringfora
change in the input state. Currently, the Counter/Encoder
Modes do not have Zero Frequency Detection - the A and B
inputs are time independent, only looking for input edge
changes to increment/decrement the count value.
The Period/Rate and Continuous Rate modes do have Zero
Frequency Detection, since the Z input is monitored for Zero
Frequency in Firmware (A and B inputs are not used and not
monitored).
The Rate Measurement mode inherently has Zero Frequency
Detection, since no A pulses in any sample period are = 0Hz
(B and Z inputs are not used and not monitored).

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Preface 4
Operational Mode Zero Frequency Detection Input Monitored
Counter No None
Encoder No None
Period/Rate Yes Z Only
Rate Measurement Y A Only