Rockwell Automation 1791-I0VX User Manual

Block I/O Cat. No. 1791-IOBX and -IOVX

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.

TTENTION:

procedures are not followed properly.

TTENTION:

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.

Tells readers where people may be hurt if

Tells readers where machinery may be damaged

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” or “processor.”

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 Description of the module, including general and hardware features 2 Installing the Module Module power requirements, location, and wiring information 3 Configuring your block I/O How to set the configuration switches and address the block I/O. 4 Troubleshooting How to use the indicators to troubleshoot your block I/O module.

How to replace the fuse.

Appendix A Specifications Specifications for the block I/O.

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–IOBX and –IOVX block I/O modules. The 1791–IOBX has 64 sinking inputs and 64 sourcing outputs; the 1791–IOVX has 64 sourcing inputs and 64 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

Table of Contents

Introducing

Block I/O

Installing Block I/O

Configuring Y

our Block I/O

Chapter 1

Chapter Objectives

General Description 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How the Block I/O Fits in a PLC System 1-3. . . . . . . . . . . . . . . . . .

Summary 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 2

Chapter Objectives Pre–installation Considerations

Installing the Block I/O 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connecting W

Remote I/O Link Wiring 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Extended Node Capability 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Compatibility of 1771 I/O Products with

Extended Node Operation 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fusing 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Summary 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iring 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 3

Chapter Objectives

Setting the Configuration Switches 3-1. . . . . . . . . . . . . . . . . . . . . . .

Summary 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1. . . . . . . . . . . . . . . . . . . . . . . . . .

3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting

Specifications

Chapter 4

Chapter Objectives

Indicators 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replacing a Fuse

Summary 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix A

Specifications A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

(This page left intentionally blank.)

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-IOBX 24V dc module has 64 sink input channels, and 64 source output channels.

The 1791-IOVX 24V dc module has 64 source input channels, and 64 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 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



500 modular controllers. When

TTENTION:

you must use a 1775-S5 or -SR5 scanner module. Do not use 1775-SR, -S4A or -S4B scanner modules.

Note: The 1791-IOBX and -IOVX 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.

Physical features of the block I/O are shown in Figure 1.1.

When using PLC-3 programmable controllers,

1-1

Chapter 1

Introducing Block I/O

Figure 1.1 Major

Features of the 1791-IOBX and -IOVX Block I/O Modules

(-IOBX shown)

Rack Address

Switch

, Active,

Power

Comm and Fuse

LED Indicators

Removable

Input Terminal

Blocks

87654321

CONFIGURATION

SWITCHES

RACK ADDR

INPUT

DISPLAY

SELECT

OUTPUT

POWER ACTIVE COMM FUSE

1791-IOBX

128

POINT

24V DC DISTRIBUTED

I/O MODULE

24VDC SINK INPUTS

64 24VDC SOURCE OUTPUTS

CONFIGURATION SWITCHES

Configuration Switches

(on top of unit)

Input/Output

Status LED

Array

Display Select

Pushbuttons

Removable

Output Terminal

Blocks

Terminal Block

Removal Screws

(same on all 4

terminal blocks)

1-2

GROUP

No.

RIO Wiring Block

+24V dc Power

GROUP No.

Termination

Resistor

Switch

10914-I

Wiring Terminals - The remote I/O field wiring is made to 4 separate removable 37-pin terminal blocks mounted on the sides of the module. Terminal assignments are shown in chapter 3.

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

Chapter 1

Introducing Block I/O

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 addr

ess switch

lets you select the system rack address for the

block.

A third switch is provided for selection of the termination resistor. Status Indicators - Indicators are provided for power, active,

communication and fuse blown indications. An LED array provides input/output status.

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

Indicator Indication

ower (green/wht)

ctive (green/red)

Comm (green/wht)

use (red/wht)

On (green) Customer voltage is present Of

f (wht) On (green) CPU operating correctly Of

f (red) On (green) Communication correctly established Of

f (wht) On (red) One of the 4 output fuses is open Of

f (wht)

No customer voltage (less than 2V)

CPU not running

Communication not established

All fuses are intact

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. Pushbuttons are provided to toggle the display between the lower 32 bits and the upper 32 bits.

How

the Block I/O Fits in a

PLC System

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-IOBX block uses sinking inputs and sourcing outputs.

1-3

Chapter 1

Introducing Block I/O

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.

Figure 1.2 Sinking

Input Example

Bus

DC Power Supply

Field Device

-V

Block I/O

Sinking Input

Common

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.

Note: The outputs must be externally fused to protect the device output against overcurrent or short circuit conditions.

1-4

Figure 1.3 Sourcing

Block I/O

Common

Output Example

Fuse

Field Device

Common

DC Power Supply

-V

Bus

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

10827-I

Chapter 1

Introducing Block I/O

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.

Figure 1.4 Sourcing

Input Example

DC Power Supply

-V

Block

I/O

Field Device

Input

dc Common Bus

10917-I

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.

Note: The outputs must be externally fused to protect the device output against overcurrent or short circuit conditions.

Figure 1.5 Sinking

Output Example

Block I/O

Fuse

Field Device

Bus

Common

DC Power Supply

-V

10918-I

1-5

Chapter 1

Introducing Block I/O

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 1/2 I/O rack to the processor, and uses 4 words of input image table memory and 4 words of output image table memory. The block is addressed directly on the remote I/O link.

Figure 1.6 Block

I/O Connection in a PLC System

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

Programmable Controller, or Scanner

Summary

Block I/O - each block is 1/2 I/O rack.

10915-I

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

1-6

Installing Block I/O

Chapter

Pre-installation Considerations

Installing the Block I/O

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

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.

2-1

Chapter 2

Installing Block I/O

0.67

(17.105)

Figure 2.1 Mounting and -IOVX)

Dimensions for the Block I/O Module (Cat. No. 1791-IOBX

6.15

(156.21)

4.8 (122.0)

87654321

CONFIGURATION

SWITCHES

RACK ADDR

Dimensions:

6.15W x 13.0H x 1.72D

(156.21W x 334.0H x 43.7D)

Inches

(Millimeters)

12.7

(322.0)

GROUP

POWER

ACTIVE

COMM

FUSE

INPUT OUTPUT

1791-IOBX 128 POINT

24V DC

DISTRIBUTED

I/O MODULE

CONFIGURATION SWITCHES

No.

DISPLAY SELECT

GROUP No.

12.28 (312.0)

13.0 (334.0)

2-2

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.

Figure 2.2 Clearance

Chapter 2

Installing Block I/O

Required for Block I/O Modules

(50.8)

Connecting Wiring

(50.8)

Inches

(Millimeters)

10919-I

Connections to the block I/O module are made to the removable terminal blocks on each side of the module. Input connections are on the left side, and output connections are on the right side. The input terminal blocks are keyed differently than the output blocks to prevent incorrect insertion.

TTENTION:

Both input terminal blocks are keyed alike. If removed for wiring, or module replacement, make certain that the terminal blocks are placed in their proper position when reinstalling.

Wiring connections for the 1791-IOBX and -IOVX are shown in Tables

2.A through 2.H.

Catalog Number 1794-IOBX Catalog Number 1794-IOVX

Input Terminal Wiring Input Terminal Wiring

Groups 0 and 1 (TRM1) Table 2.A, page 2-4 Groups 0 and 1 (TRM1) Table 2.E, page 2-8 Groups 2 and 3 (TRM2) Table 2.B, page 2-5 Groups 2 and 3 (TRM2) Table 2.F, page 2-9

Output Terminal Wiring Output Terminal Wiring

Groups 0 and 1 (TRM3) Table 2.C, page 2-6 Groups 0 and 1 (TRM3) Table 2.G, page 2-10 Groups 2 and 3 (TRM4) Table 2.D, page 2-7 Groups 2 and 3 (TRM4) Table 2.H, page 2-11

Remote I/O link wiring connections are shown in Figure 2.3.

2-3

Chapter 2

Numb

Installing Block I/O

able 2.A

1791-IOBX

Input T

erminal W

iring for Groups 0 and 1 (TRM1) for PLC

Family Controllers and SLC Processors

Terminal

Input Assignment

Group 0

PLC SLC

Terminal

Input Assignment

Group 1

PLC SLC

1 Common A Common A 19 Common B Common B 2 Input 00 Input 00 20 Input 00 Input 00 3 Input 01 Input 01 21 Input 01 Input 01 4 Input 02 Input 02 22 Input 02 Input 02 5 Input 03 Input 03 23 Input 03 Input 03 6 Input 04 Input 04 24 Input 04 Input 04 7 Input 05 Input 05 25 Input 05 Input 05 8 Input 06 Input 06 26 Input 06 Input 06

9 Input 07 Input 07 27 Input 07 Input 07 10 Input 10 Input 08 28 Input 10 Input 08 11 Input 11 Input 09 29 Input 11 Input 09 12 Input 12 Input 10 30 Input 12 Input 10 13 Input 13 Input 11 31 Input 13 Input 11 14 Input 14 Input 12 32 Input 14 Input 12 15 Input 15 Input 13 33 Input 15 Input 13 16 Input 16 Input 14 34 Input 16 Input 14 17 Input 17 Input 15 35 Input 17 Input 15 18 N.C. N.C. 36 N.C. N.C.

37 N.C. N.C.

PLC SLC

INPUT

COM

COM 00

INPUT

COM

COM 00

2-4

Common

36 37

12490-I

+ 36 hidden pages