Allen-Bradley 1771-DA Bedienungsanleitung

User

Manual

ASCII I/O Module

(Cat.

No. 1771-DA)

AllenBradley

StockCheck.com

To Our Customers 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview of This Manual 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Intended Audience 11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Notational Conventions 11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Some Tips on Using This Manual 12

. . . . . . . . . . . . . . . . . . . . . . . .

Typical

Applications

13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Getting Started With Y

our ASCII Module

21. . . . . . . . . . . . . .

PLC2 Family Processors 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What You Need to Get Started 22

. . . . . . . . . . . . . . . . . . . . . . . . . .

Reading Data from Your ASCII Device 210

. . . . . . . . . . . . . . . . . . . . .

Writing

Data to Y

our ASCII Device 214. . . . . . . . . . . . . . . . . . . . . . . .

PLC3 Processors 218

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What You Need T

o Get Started

218. . . . . . . . . . . . . . . . . . . . . . . . . .

Reading Data from Your ASCII Device 228

. . . . . . . . . . . . . . . . . . . . .

Writing

Data to Y

our ASCII Device 232. . . . . . . . . . . . . . . . . . . . . . . .

Choosing Module Features 31. . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Choosing

the Mode of Communication

31. . . . . . . . . . . . . . . . . . . . .

Choosing the Mode of Module Operation, IW1(0204) 313

. . . . . . . . . .

Using BCD Delimiters (Report Generation Mode, Only), IW4(1016) 314

Justifying Margins, IW3(03) 315. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the EndofString Delimiter, IW3(1016) 317

. . . . . . . . . . . . . . . .

Setting String Length, IW2(0013) 318

. . . . . . . . . . . . . . . . . . . . . . . .

Determining Block Transfer Length 320

. . . . . . . . . . . . . . . . . . . . . . .

Removing the Fill Character (Data Mode, Only), IW4(1016) 321

. . . . .

Removing Header and Trailing Characters, IW4(0003, 0407) 323

. . . .

Choosing

I/O Buf

fer Size, IW3(0002) 324. . . . . . . . . . . . . . . . . . . . .

Choosing Transmission Mode, IW1(0507) 325

. . . . . . . . . . . . . . . . . .

Choosing

Single or Multiple T

ransfers, IW2(17) 325. . . . . . . . . . . . . . .

Selecting Delay for Carriage Return, IW3(0607) 326

. . . . . . . . . . . . . .

Setting Remaining Bits in IW1(1017) 326

. . . . . . . . . . . . . . . . . . . . . .

Selecting

the Number of Initialization W

ords, IW1(0001) 329. . . . . . . .

Recording

Bit Settings in Initialization W

ords 330. . . . . . . . . . . . . . . . .

Table of Contents

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Table of Contentsii

ASCII

I/O Module T

utorial 41. . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PLC2 Family Processors 42

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adding

Initialization Rungs

42. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setting

Bits in Initialization W

ords 44. . . . . . . . . . . . . . . . . . . . . . . .

Expanding

the Number of Initialization W

ords 45. . . . . . . . . . . . . . . .

Changing

the Module'

s String Length (Read, Only) 45. . . . . . . . . . . .

Justifying

Data

47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Demonstrating EndofString Delimiter 49

. . . . . . . . . . . . . . . . . . . . .

Removing the Fill Character 414

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing Header and Trailing Characters 415

. . . . . . . . . . . . . . . . . .

Demonstrating Data Conversion 417

. . . . . . . . . . . . . . . . . . . . . . . . .

Selecting Report Generation Mode, Data Conversion,

and BCD Delimiter

419. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Formatting a SingleLine Message 421

. . . . . . . . . . . . . . . . . . . . . . . .

Formatting a MultiLine Message 424

. . . . . . . . . . . . . . . . . . . . . . . . .

PLC3 Processors 427

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adding

Initialization Rungs

427. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setting

Bits in Initialization W

ords 430. . . . . . . . . . . . . . . . . . . . . . . .

Expanding

the Number of Initialization W

ords 432. . . . . . . . . . . . . . . .

Changing

the Module'

s String Length (Read, Only) 432. . . . . . . . . . . .

Justifying

Data

434. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Demonstrating EndofString Delimiter 435

. . . . . . . . . . . . . . . . . . . . .

Removing the Fill Character 440

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing Header and Trailing Characters 442

. . . . . . . . . . . . . . . . . .

Selecting Report Generation Mode, Data Conversion,

and BCD Delimiter

443. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Formatting a SingleLine Message 446

. . . . . . . . . . . . . . . . . . . . . . . .

Formatting a MultiLine Message 449

. . . . . . . . . . . . . . . . . . . . . . . . .

Demonstrating Data Conversion 452

. . . . . . . . . . . . . . . . . . . . . . . . .

Summary 455

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handshaking 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Understanding Handshaking Fundamentals 51

. . . . . . . . . . . . . . . . .

Reading Status and/or Data from the Module 53

. . . . . . . . . . . . . . . .

Function of Control and Status Bits 61. . . . . . . . . . . . . . . . . .

Chapter

Objectives

61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Command Words 61

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Initialization Words 63

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Status Words 613

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Table of Contents iii

Troubleshooting 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter

Objectives

71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Recognizing

Initialization Errors

71. . . . . . . . . . . . . . . . . . . . . . . . . .

How You Interpret Status Indicators 72

. . . . . . . . . . . . . . . . . . . . . . .

How You Interpret Codes in Status Word One 74

. . . . . . . . . . . . . . . .

Testing the ASCII Module and Cables 77

. . . . . . . . . . . . . . . . . . . . .

PLC2 Family Processors A1. . . . . . . . . . . . . . . . . . . . . . . . .

Complete Getting Started Program, PLC2 Family A1. . . . . . . . . . . . .

Block Transfer Programming A3

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Block Transfer Timing A5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example Read (Only) Program A15

. . . . . . . . . . . . . . . . . . . . . . . . . .

Example Write (Only) Program A18

. . . . . . . . . . . . . . . . . . . . . . . . . .

Example Read/Write Program A19

. . . . . . . . . . . . . . . . . . . . . . . . . . .

Example Application Write Program A22

. . . . . . . . . . . . . . . . . . . . . . .

For PLC-3 Family Processor A26

. . . . . . . . . . . . . . . . . . . . . . .

Complete Getting Started Program, PLC-3 A26

. . . . . . . . . . . . . . . . .

Block Transfer Programming A30

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example Read (Only) Program A41

. . . . . . . . . . . . . . . . . . . . . . . . . .

Example Write (Only) Program A45

. . . . . . . . . . . . . . . . . . . . . . . . . .

Example Read/Write Program A47

. . . . . . . . . . . . . . . . . . . . . . . . . . .

Example Application Read/Write Program A50

. . . . . . . . . . . . . . . . . .

For PLC3 Family Processor B1. . . . . . . . . . . . . . . . . . . . . . .

Complete Getting Started Program, PLC3 B1. . . . . . . . . . . . . . . . . .

Block Transfer Programming B5

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Example Read (Only) Program B16

. . . . . . . . . . . . . . . . . . . . . . . . . .

Example Write (Only) Program B20

. . . . . . . . . . . . . . . . . . . . . . . . . .

Example Read/Write Program B22

. . . . . . . . . . . . . . . . . . . . . . . . . . .

Example Application Read/Write Program B25

. . . . . . . . . . . . . . . . . .

ASCII Conversion Tables C1. . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications D1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Preface

To Our Customers

This manual tells you in a tutorial manner how to install and use your

ASCII module.

Chapter

Entitled W

e W

ill Show Y

ou How T

Getting Started with

our ASCII Module

Read data from your ASCII module and write data to it

using an industrial terminal

Choosing Module

Features

Choose module features so you can match your ASCII

module with your ASCII device

ASCII Module T

utorial

Select and demonstrate module features, and format

messages

4 Handshaking

Program the handshaking logic that controls

communication between your ASCII module and your PC

processor

Functions of Control

and Status Bits

Select desired features and read module status by

describing the function of bits in command and status

words

6 T

roubleshooting Y

our ASCII

Module

Interpret status indicators and status codes, and use a

simple program to test your ASCII module.

 Appendix

Program block transfer communication and estimate the

time required for read/write handshaking. W

e have

included numerous example programs

 Index

Locate concepts and definitions in the text

We assume that you are familiar with operating and programming your

Allen-Bradley controller. Because of the functions that your module

performs, your programming skills should include file manipulation and

message formatting. Refer to the Programming and Operations Manual

for your PLC-2 family controller or to the Programming Manual for your

PLC-3 controller.

Some chapters in this manual contain examples of how you enter data or

commands. When you read these chapters, remember the following

notational conventions:

Overview of This Manual

Intended Audience

Notational Conventions

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To Our Customers

Preface

A symbol or word in brackets represents a single key you would press.

These include keys such as [ENTER], [SHIFT], or [ ].

Spaces would be entered as shown, except that the space preceding and

following the brackets is not an entered space. (We put a space before

the left bracket and after the right bracket to make it easier to read).

Numbers and capital letters not in brackets would be entered as shown.

Punctuation such as commas, and symbols such as / would be entered

as shown.

For example, typical data and a typical command that you would enter on

the industrial terminal keyboard are as follows:

Enter: ALLEN 123/AB[ENTER] (data)

Enter: DD,O3:0,[SHIFT]%A[ENTER] (PLC-3 command)

We have included numerous examples of CRT displays resulting from

data or commands that you enter. All CRT displays are shown with a

shaded background. Enter all commands on the industrial terminal

keyboard. The only exception is for some PLC-3 entries where we tell

you to use the PLC-3 front panel.

Read chapters 1 and 2 before proceeding to other chapters of this manual

that pertain to your needs. For example, you may want to use only

selected module features (chapter 3) and read only selected bit

descriptions (chapter 5).

We have developed forms to assist you in selecting module features and in

troubleshooting. Make a copy of each of the following and refer to them

as needed.

Initialization Words for Data Mode Form 5175, chapter 2

Initialization Words for Report

Generation Mode Form 5176, chapter 2

Command and Status Words Figure 5.2-5.4 chapter 5

Fault Status Table 6.E, chapter 6

Some Tips on Using This Manual

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To Our Customers

Preface

You will use several procedures frequently in the tutorial chapters of this

manual. You may want to memorize the steps or have a reference copy of

the following procedures:

Reading Data From Your ASCII Device

Writing Data To Your ASCII Device

Setting Bits in Initialization Words

You can use an ASCII I/O module to input data to the processor from a

data source such as a bar code reader, output messages from the processor

to a display device, or bidirectionally exchange messages and/or data

between an intelligent data terminal and the processor. Typical examples

are as follows:

Devices

Type

Device Applications

Bar code readers

Input

Part recognition, sorting, inventory control

Keypads Input

Enter values, change data

Dotmatrix scrolling

displays, terminals, or

printers

Output

Display warnings or diagnostic messages,

print production reports

Intelligent data

terminals

Input/Output

Enter values, change data, monitor or

troubleshoot a process

Computers Input/Output

Exchange data files

Typical Applications

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Chapter 2

21

Getting Started With Your ASCII Module

ASCII is the acronym for American Standard Code for Information

Interchange. The standard includes a 7-bit code for 128 data and control

characters.

With your ASCII I/O module you can transfer data, by means of the I/O

scan, from an ASCII device to the PC processor data table, and vice versa.

The module has two modes of operation, data mode and report generation

mode. In data mode, you can transfer ASCII, BCD, or hex characters.

Generally, use this mode to transfer data to the processor data table. In

report generation mode, you can include BCD values in the string of

ASCII characters. Generally, use this mode when you want to transfer

messages.

You can use your ASCII module with any Allen-Bradley programmable

controller that has an expandable data table, block transfer capability, and

uses the 1771 I/O structure. If you use a PLC-2/20 controller (cat. no.

1772-LP2), your programming will be lengthier because its processor

does not have file move or block transfer instructions.

Getting Started with Your ASCII Module is a hands-on exercise. By

going step by step through two easy examples, you will quickly learn

operation of your module’s basic features.

This chapter is divided into two sections, one for PLC-2 family

processors, the other for PLC-3 processors. Proceed to the section that

pertains to your processor.

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Getting Started with Your ASCII Module

Chapter 2

22

PLC2 Family Processors

You will demonstrate the operation of your ASCII module by reading data

from the industrial terminal to the processor data table, and by writing

data from the data table to the industrial terminal. You will use your

industrial terminal as an ASCII device for entering data (read), and for

displaying data (write).

You will need to set up a PC processor with an I/O chassis, power supply,

industrial terminal, cables, and your ASCII module. You will need about

an hour to complete the tutorial exercises in this chapter, and about two

hours to complete those of chapter 3, once you have the equipment

operating properly.

Equipment That You Need

You will need the following equipment (Table 1.A) using your existing

system and/or spare equipment.

Table 1.A

Equipment

(PLC2 Family)

Equipment

Catalog Number

ASCII I/O module

1771DA

Industrial T

erminal 1770T3

PLC2 Family Keytop Overlay

1770KCB

Alphanumeric Keytop Overlay

1771KAA optional

Processor Interface Cable

1772TC

IT/DH Adapter Cable

1770CB (figure 1.4)

I/O Chassis

1771A1, A2, A4

Processor PLC2/20, 2/30

Power Cable

1771CJ, CK

I/O Interconnect Cable 1777CB, CA

Local Adapter Module

1771AL

ermination Plug

1777CP

What You Need to Get Started

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Getting Started with Your ASCII Module

Chapter 2

23

Processor

MiniPLC2/15

Power Supply

1771P1

Power Cable

1771CL

Note: You must use battery back-up.

The ASCII module draws 1.3A from the backplane. Be sure that the total

current drain of all modules in the chassis does not exceed the maximum

for the backplane and power supply.

If you use an existing system, consider disconnecting all other chassis

except the one containing your ASCII module. Disconnect field wiring

arms from output modules for safety purposes.

How to Connect Your Equipment

Connect your equipment with the appropriate cables (Figure 1.1 for

Mini-PLC-2/15 controllers, Figure 1.2 for PLC-2/20 or-2/30 controllers).

Be sure that the end of your IT/DH adapter cable labeled CHANNEL B is

connected to channel B on the industrial terminal.

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