Rockwell Automation 1791-I0VW User Manual

Block I/O Cat. No. 1791IOBW and IOVW

User Manual

Important User Information

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: Tells readers where people may be hurt if procedures are not followed properly.

ATTENTION: Tells readers where machinery may be damaged or economic loss can occur if procedures are not followed properly.

Attention helps you:

Identify a hazard. Avoid the hazard. Recognize the consequences.

Important: We recommend you frequently backup your application programs on appropriate storage medium to avoid possible data loss.

Using This Manual P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Purpose Audience P1 Vocabulary P1 Manual Organization P1 About

of Manual

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

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

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

Block I/O

P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introducing Block I/O 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter General Description 11 How

Objectives

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

the Block I/O Fits in a PLC System

11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Installing Block I/O 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Preinstallation Considerations 21 Installing Connecting Wiring 23 Remote I/O Link Wiring 29 Extended Compatibility of 1771 I/O Products with Extended Node Operation 211

Objectives

the Block I/O

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

Node Capability

21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuring Your Block I/O 31. . . . . . . . . . . . . . . . . . . . . . . .

Chapter Setting

Objectives

the Configuration Switches

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

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

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

Chapter Indicators 41 Replacing a Fuse 43 Summary 44

Objectives

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

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

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

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

Specifications A1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using This Manual

Preface

Purpose

of Manual

Audience

Vocabulary

Manual Organization

This manual shows you how to use your block I/O 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 block I/O modules.

We assume that you know how to do this in this manual. If you do not, refer to the appropriate PLC programming and operations manual before you attempt to program this module.

In this manual, we refer to:

the block I/O module as the “block” or the “module” the programmable controller as the “controller”

This manual is divided into 4 chapters. The following chart shows each chapter with its corresponding title and brief overview of the topics covered in that chapter.

Chapter Title Topics Covered

1 Introducing Block I/O

2 Installing Block I/O

4 Troubleshooting

Appendix A Specifications Specifications for the block I/O.

Configuring Your Block I/O for PLC Family Programmable Controllers

Description of the modules, including general and hardware features

Module power requirements, location, and wiring information

How to set the configuration switches and address the block I/O.

How to use the indicators to troubleshoot your block I/O module.

P-1

Preface

Using This Manual

About

Block I/O

Related Publications

Block I/O consists of small, self–contained remote I/O devices complete with power supply, programmable controller interface, input/output connections and signal conditioning circuitry.

This publication covers the 1791–IOBW and –IOVW block I/O modules. The 1791–IOBW has 32 sinking inputs and 32 sourcing outputs; the 1791–IOVW has 32 sourcing inputs and 32 sinking outputs. In all other aspects, they are identical.

For a list of publications with information on Allen–Bradley programmable controller products, consult our publication index (SD499).

P-2

Introducing Block I/O

Chapter

Objectives

General Description

In this chapter you will learn what block I/O is, its features, and how it functions.

Block I/O consists of small, self-contained remote I/O devices complete with power supply, programmable controller interface, input/output connections and signal conditioning circuitry.

The 1791-IOBW 24V dc module has 32 sink input channels, and 32 source output channels.

The 1791-IOVW 24V dc module has 32 source input channels, and 32 sink output channels.

Complete specifications for these modules are contained in Appendix A.

The blocks are compatible with PLC-2 programmable controllers, and the SLC 500 used with PLC-2 family programmable controllers, a sub-scanner module is used to communicate with the blocks. When used with PLC-3 and PLC-5 family programmable controllers, they can be connected directly to the controller or to a scanner module. When used with SLC 500 controllers, a 1747-SN remote I/O scanner is used to communicate with the blocks.



, PLC-3, and PLC-5 family



modular controllers. When

ATTENTION: However, when using PLC-3 programmable controllers, you must use a 1775-S5 or -SR5 scanner module.

Do not use 1775-SR, -S4A or -S4B scanner modules.

Note: The 1791-IOBW and -IOVW block modules are not compatible

with the 1747-DSN scanner module.

Connections are made to removable terminal blocks mounted on the sides of the block.

Figure 1.1 shows the physical features of the block I/O.

1-1

Chapter 1

Introducing Block I/O

Figure 1.1

Features of the 1791IOBW and IOVW Block I/O Modules

Major (IOBW shown)

Rack Address Switch

Power, Active, Comm and Fuse LED Indicators

Removable Input Terminal Blocks

RACK ADDR

87654321

CONFIGURATION

SWITCHES

POWER ACTIVE COMM FUSE

1791IOBW 64 POINT 24V DC DISTRIBUTED I/O MODULE

CONFIGURATION SWITCHES

Configuration Switches (on top of unit)

Input/Output

Status LED

Array

Removable

Output Terminal

Blocks

RIO Wiring Block

+24V dc Power

Termination Resistor Switch

10914I

Wiring Terminals - The remote I/O field wiring is made to two separate removable 37-pin terminal blocks mounted on the sides of the module. Terminal assignments are shown in chapter 2.

1-2

A separate nonremovable terminal block is provided for connection of the remote I/O link and external 24V dc power supply.

Switch Assemblies - Two DIP switches are provided for setting the I/O configuration and rack address.

The configuration switch lets you select baud rate, last state, processor restart lockout, last rack and I/O group.

The rack address switch lets you select the system rack address for the block.

A third switch is provided for selection of the built-in termination resistor.

Chapter 1

Introducing Block I/O

Status Indicators - Bi-color LED indicators provide power, active, communication and fuse blown indications. An LED array provides input/output status.

Indicator Indication

How the Block I/O Fits in a PLC System

Power(green/wht)

Power (green/wht)

Active(green/red)

Active (green/red)

Comm(green/wht)

Comm (green/wht)

Fuse(red/wht)

Fuse (red/wht)

On (green) Customer voltage is present

Off (wht)

On (green) CPU operating correctly

Off (red)

On (green) Communication correctly established

Off (wht)

On (red) One of the fuses is open

Off (wht) Both fuses are intact

No customer voltage

CPU not running

Communication not established

The I/O status array is an 8 by 8 array of 64 LEDs capable of displaying the status of 32 inputs and 32 outputs at any one time.

Block I/O is a complete I/O interface that includes the functionality of the I/O rack, adapter, power supply, and I/O modules in a single unit. Simply connect sensors and actuators to the module and use the remote I/O cable to connect the block I/O to your programmable controller (Figure 1.6).

The 1791-IOBW block uses sinking inputs and sourcing outputs.

In sinking inputs, the dc common is bussed on the block. and the current is sourced from the field device. The sourcing field device switches the hot side of the power supply bus causing current to flow through the sourcing device to the sinking input on the block. Refer to Figure 1.2.

1-3

Chapter 1

Introducing Block I/O

Figure 1.2

Input Example

Sinking

dc Power Supply

Field Device

V

Block I/O

Sinking Input

10826I

Sourcing outputs have the power bussed in the block. When the output is on, current is supplied to the field control device, which sinks the current. The field circuit and the equipment remain at ground potential until the output is turned on. Refer to Figure 1.3.

Figure 1.3 Sourcing

Output Example

Block I/O

Fuse

Field Device

dc Power Supply

V

Bus

10827I

The 1791-IOVW block uses sourcing inputs and sinking outputs.

In sourcing input modules (Figure 1.4), the +V on dc circuits is bussed on the module supplying (sourcing) the current for each input circuit. The field device switches the circuit to the common (side of the power supply, sinking the circuit and causing current to flow from the module’s input

1-4

Chapter 1

Introducing Block I/O

Figure 1.4

dc Power Supply

V

Input Example

Field Device

Block

Input

I/O

10917I

Sourcing

dc Common Bus

In sinking outputs (Figure 1.5), the current flow is reversed. The dc common is bussed on the module and the current is sourced from the field device being actuated. When an output is turned on, the output switch in the module sinks the circuit, causing current to flow from the +V bus through the field device to the module.

Figure 1.5

Output Example

Sinking

Block I/O

Fuse

Field Device

Common

Bus

dc Power Supply

V

10918I

Block I/O functions exactly like any Allen-Bradley remote I/O product. Input and output data is scanned asynchronously and transferred back and forth between the block and the controller input and output image table.

You connect the block I/O to your remote I/O link as you would any other device. The block looks like a 1/4 I/O rack to the processor, and uses 2 words of input image table memory and 2 words of output image table memory. The block is addressed directly on the remote I/O link.

1-5

Chapter 1

Introducing Block I/O

Programmable Controller or Scanner

Figure 1.6

I/O Connection in a PLC System

Block

Block I/O  each block is 1/4 I/O rack.

Blocks are daisychained to a programmable controller or scanner.

10915I

1-6

Installing Block I/O

Chapter

Preinstallation Considerations

Objectives

In this chapter you will learn how to mount the block, how to connect the remote I/O link, how to connect the input and output wiring to the block, and how to terminate the remote I/O link.

Before installation, you must determine:

the number of blocks desired the total distance of the installation transmission rate desired

2-1

Chapter 2

Installing Block I/O

Installing the Block I/O

Inches (Millimeters)

0.67 (17.105)

6.54 (166.0)

Mounting dimensions for the block I/O module are shown in Figure 2.1. Mount the blocks horizontally with a minimum of 2” between blocks. This air gap is necessary to maintain proper cooling air flow through the block.

Figure 2.1 Mounting IOVW)

Dimensions for the Block I/O Module (Cat. No. 1791IOBW and

6.15 (156.21)

4.8 (122.0)

87654321

CONFIGURATION

SWITCHES

RACK ADDR

POWER ACTIVE COMM FUSE

1791IOBW

64 POINT

24VDC DISTRIBUTED

I/O MODULE

CONFIGURATION SWITCHES

6.2 (157.0)

7.0 (178.0)

Dimensions:

6.15W x 7.0H x 1.72D

(156.21W x 178.0H x 43.7D)

10916I

The operating temperature in the air gap between block I/O modules must not exceed 60

C (140oF). The dimensions of the air gap required are

shown in Figure 2.2.

2-2

+ 28 hidden pages

Rockwell Automation 1791-I0VW User Manual

Table of Contents

General Description

Installing the Block I/O