Allen-Bradley 1794-VHSC Bedienungsanleitung

–1

User

Manual

Very High

Speed Counter

Module

(Cat. No. 1794-VHSC)

Allen-Bradley

Allen-Bradley Spares

Because of the variety of uses for the products described in this

publication, those responsible for the application and use of this control

equipment must satisfy themselves that all necessary steps have been

taken to assure that each application and use meets all performance and

safety requirements, including any applicable laws, regulations, codes

and standards.

The illustrations, charts, sample programs and layout examples shown in

this guide are intended solely for example. Since there are many

variables and requirements associated with any particular installation,

Allen-Bradley does not assume responsibility or liability (to include

intellectual property liability) for actual use based upon the examples

shown in this publication.

Allen-Bradley publication SGI–1.1, “Safety Guidelines For The

Application, Installation and Maintenance of Solid State Control”

(available from your local Allen-Bradley office) describes some

important differences between solid-state equipment and

electromechanical devices which should be taken into consideration

when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in whole or

in part, without written permission of Allen–Bradley Company, Inc.

is prohibited.

Throughout this manual we make notes to alert you to possible injury to

people or damage to equipment under specific circumstances.

!ATTENTION: Identifies information about practices or

circumstances that can lead to personal injury or death,

property damage, or economic loss.

Attention helps you:

•identify a hazard

•avoid the hazard

•recognize the consequences

Important: Identifies information that is especially important for

successful application and understanding of the product.

Important: We recommend you frequently backup your application

programs on appropriate storage medium to avoid possible

data loss.

FLEX I/O, DeviceNet, DeviceNetManager, and RediSTATION are trademarks of Allen-Bradley Company, Inc.

PLC, PLC–2, PLC–3, and PLC–5 are registered trademarks of Allen-Bradley Company, Inc.

All other brand and product names are trademarks or registered trademarks of their respective companies.

Important User Information



Publication

1794-6.5.10 – December 1998



This manual shows you how to use the Very High Speed Counter

module with an Allen-Bradley programmable controller. It helps you

install, program, and troubleshoot your module.

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.

In this manual, we refer to:

•the Very High Speed Counter module as the “module,” the

“1794-VHSC” or the “VHSC module.”

•the programmable controller as the “controller,” or the “PLC.”

This manual is divided into 5 chapters. The following chart shows

each chapter with its corresponding title and a brief description of

the topics covered in that chapter.

Chapter Title Topics Covered

1Overview of theVery High Speed Counter Module Explanation of modes, outputs, and how the

module communicates with the processor.

2Installing the Very High Speed Counter Module How to install, key, connect wiring, ground and an

explanation of the indicators on the module.

3Programming Your Very High Speed Counter

Module Use RSLogics to program this module.

4Input, Output and Configuration Files for the Very

High Speed Counter on ControlNet Identification and description of bit/words for input,

output and configuration.

5Troubleshoot the Very High Speed Counter Module Using the indicators for troubleshooting and

diagnostic codes.

Appendices

A Specifications Specifications for the 1794-VHSC module.

Purpose of This Manual

Audience

Vocabulary

Manual Organization

Allen-Bradley Spares

Using This ManualP–2

Publication

1794-6.5.10 – December 1998

You can install your input module in any system that uses

Allen-Bradley programmable controllers and the 1794 I/O structure.

Contact your nearest Allen-Bradley office for more information

about your programmable controllers.

This module can be used with 1794-ACN15 series B and -ACNR15

series B or later ControlNet Adapters. Communication between the

module and the processor is bidirectional. The PLC sends module

information using ControlNet messages to the adapter. The PLC

receives module status information through ControlNet messages

from the adapter.

For a list of publications with information on Allen-Bradley

programmable controller products, consult our publication index

SD499.

Related Products

Product Compatibility

Related Publications

Publication

1794-6.5.10 – December 1998

Chapter 1

Chapter Objectives 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Features

of the Module

1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operation

in Encoder or Counter Mode

1–2. . . . . . . . . . . . . . . . . . . . .

Counter

Mode

1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Encoder

Mode

1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preset Value 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rollover Value 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Software Reset 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gate/Reset

Input

1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operation

in Period/Rate Mode

1–8. . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous/Rate

Mode

1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operation

in Rate Measurement Mode

1–12. . . . . . . . . . . . . . . . . . . . .

Pulse

Width Modulation

1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Outputs 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Enabling

and Forcing Outputs

1–13. . . . . . . . . . . . . . . . . . . . . . . . . .

Assigning

Outputs to Counter Windows

1–13. . . . . . . . . . . . . . . . . . .

Operation

of Outputs

1–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What

the High Speed Counter Module Does

1–15. . . . . . . . . . . . . . . . .

Chapter Summary 1–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 2

What

This Chapter Contains

2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Before Y

ou Install Y

our Input Module

2–1. . . . . . . . . . . . . . . . . . . . . . .

European

Union Directive Compliance

2–1. . . . . . . . . . . . . . . . . . . . . .

EMC Directive 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Low V

oltage Directive

2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Requirements 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wiring

the T

erminal Base Units (1794-TB3G shown) 2–3. . . . . . . .

Installing

the Module

2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting

the T

erminal Base Unit on a DIN Rail

2–4. . . . . . . . . . . . .

Panel/Wall

Mounting

2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting

the High Speed Counter Module on the

erminal Base Unit

2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connecting

Wiring for the High Speed Counter Module

2–9. . . . . . . . . .

Wiring

connections for the 1794-VHSC High Speed

Counter Module

2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example

of Quadrature Encoder Wiring to a 1794-TB3G T

erminal

Base Unit

2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module

Indicators

2–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Summary 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

Overview of the Very High

Speed Counter Module

How to Install Your Very

High Speed Counter Module

Allen-Bradley Spares

Table of Contentsii

Publication

1794-6.5.10 – December 1998

Chapter 3

Programming Y

our High Speed Counter Module

3–1. . . . . . . . . . . . . . .

Chapter 4

Chapter Objectives 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

About

the ControlNet Adapter

4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Communication Over the FLEX I/O Backplane 4–1. . . . . . . . . . . . . . . .

Scheduled

Data-T

ransfer 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unscheduled

Data-T

ransfer 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . .

Module

I/O Mapping

4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I/O

Structure

4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adapter

Input Status W

ord 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safe

State Data

4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Device Actions 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Communication

Fault Behavior

4–5. . . . . . . . . . . . . . . . . . . . . . . . .

Idle

State Behavior

4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input

Data Behavior upon Module Removal

4–5. . . . . . . . . . . . . . . .

High

Speed Counter Module (1794-VHSC) Image T

able Mapping

4–6

Chapter 5

What

This Chapter Contains

5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Status

Indicators

5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostic

Codes Returned by the Module

5–2. . . . . . . . . . . . . . . . . . .

Diagnostics

Reported in W

ord 8 of BTR

5–2. . . . . . . . . . . . . . . . .

What’s Next 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix A

Specifications A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Derating Curve A–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Programming Your Very

High Speed Counter Module

Input, Output and

Configuration Files for the

Very High Speed Counter on

ControlNet

Troubleshoot the Very High

Speed Counter Module

Specifications

Chapter 1

Publication

1794-6.5.10 – December 1998

Overview of the Very High

Speed Counter Module

This chapter gives you information on:

•features of the 1794-VHSC module

•how the module communicates with programmable controllers.

•how the module operates

The VHSC module performs high speed counting for industrial

applications. The module is an intelligent I/O module that interfaces

signals with any Allen-Bradley programmable controller that has

ControlNet capability.

The VHSC module, once configured for its intended purpose, can

continue to operate without flexbus power. (Note: Customer power

is required for the module, inputs and outputs.) After scanning the

inputs and updating the outputs, the input data is converted to a

specified data type in a digital format to be transferred to the

processor’s data table on request. Command and configuration data

is sent from the programmable controller data tables to the module

via ControlNet.

Features of the Module

The HSC module counts pulses from encoders (such as

Allen-Bradley Bulletin 845), pulse generators or mechanical limit

switches, proximity switches, etc. and returns either a count or

frequency in binary format.

The module’s features include:

•2 counters configurable for 3 encoder modes, counter mode,

period/rate mode, continuous/rate mode, rate measurement and

pulse width modulation (PWM)

•4 outputs, isolated in pairs

•outputs are current-sourcing at 5 or 12– 24V dc (0.5mA max. @

5V; 1A max. @ 12–24V)

•single-ended or differential inputs

•2-phase encoder inputs up to a frequency of 250KHz (X 4 mode)

•single-phase counter inputs up to a frequency of 1MHz

•input voltage range of 5 or 24V dc

Chapter Objectives

Module Description

Allen-Bradley Spares

1–2 Overview of the Very High Speed Counter Module

Publication

1794-6.5.10 – December 1998

•returns input as count or frequency in binary format

•input counts as high as 16,777,215

•up to 1MHz in period/rate or rate measurement frequency modes

•outputs can be tied to any or all counter windows

•each output has a user-selectable on-off value

•outputs can be tied back to an input for cascading

•each counter has a user-selectable preset and rollover value

•totalization is provided in period/rate, continuous/rate and rate

measurement modes

•module can continue counting without flexbus power (after

configuration)

•outputs have safe state values which can be applied when there is

a network failure or the PLC is switched to PROGRAM mode

•pulse width modulation (PWM) mode is available

The 1794-VHSC module operates in the following modes:

•counter mode –

•encoder X1 mode

•encoder X2 mode

•encoder X4 mode

•period/rate mode

•continuous/rate mode

•rate measurement frequency mode

•pulse width modulation (PWM)

The operation of the module in these modes is described below.

The operation of encoder and counter modes is virtually identical.

The only difference between the two modes is in the type of

feedback used.

Use the counter mode if you need the module to read incoming

pulses from a maximum of 2 encoders (single-ended or differential),

counters, pulse generators, mechanical limit switches, etc. and return

them to the programmable controller as a binary number

(0-16,777,215).

Use the encoder modes if you need the module to read incoming

quadrature pulses and return them to the programmable controller as

a binary number (0-16,777,215). In these modes, the module accepts

two-phase quadrature feedback and counts up or down depending

upon the condition of the phase B input for each counter.

Operation in Encoder or

Counter Mode

1–3Overview of the Very High Speed Counter Module

Publication

1794-6.5.10 – December 1998

The operation of the module in the encoder/counter modes is as

follows:

•counter mode - channel B is direction control (up or down).

Channel A input is used for pulse. The count is bidirectional with

the direction determined by channel B.

•encoder X1 - This is a bidirectional count mode; counting up or

down, using quadrature input signals.

•encoder X2 - This is a bidirectional count mode, using quadrature

input signals, with 2 times the resolution of X1.

•encoder X4 - This is a bidirectional count mode, using quadrature

input signals, with 4 times the resolution of X1.

Each of the counters in encoder/counter mode has values associated

with it. These are:

•preset value

•rollover value

Counter Mode

The counter mode allows the module to read incoming pulses and

return them to the programmable controller processor as a binary

number (0-16,777,215).

In the counter mode, direction (up counting or down counting) is

determined by the phase B input, which can be a random signal. If

Phase B is high, the counter will count down. If phase B is low or

floating, (that is, not connected), the counter counts up.

If Phase B is: Counter will count (direction):

High Down

Low or floating (not connected) Up

The module reads incoming pulses from a maximum of 2 encoders

(single-ended or differential), counters, pulse generators, mechanical

limit switches, and so forth and returns a count to the programmable

controller processor in a binary number (0-16,777,215).

The counter mode accepts only one phase feedback. This

relationship is shown in figure 1.1.

Allen-Bradley Spares

1–4 Overview of the Very High Speed Counter Module

Publication

1794-6.5.10 – December 1998

Figure 1.1

Block Diagram of Counter Mode

BInput A

Input B

Z (Store Count)

Single Phase Pulse Generator 1794-VHSC

Input Z

(Gate/Reset)

Count Up Count Down

Input

B Input

Count

01 2 3 2 1 0

Outputs updated continuously

+–

Encoder Mode

The encoder mode allows the module to read incoming pulses and

return them to the programmable controller processor as a binary

number (0-16,777,215).

In this mode, the module will accept two phase quadrature feedback.

The module senses the relationship between the 2 phases and counts

up or down accordingly.

Encoder X1 mode – quadrature input signals count on the leading

edge or the trailing edge of channel A for a bidirectional count. The

phase relationship between Channel A and Channel B determines

direction – channel A leading, and channel B floating, the count

direction is up; channel A lagging, and channel B high, the count

direction is down.

Encoder X2 mode – quadrature input signals count on the leading

edge and the trailing edge of 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.

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