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Allen-Bradley 1756-OB8 - User Manual

Allen-Bradley 1756-OB8
258 pages
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ControlLogix Digital I/O Modules
Catalog Numbers 1756-IA8D, 1756-IA16, 1756-IA16I, 1756-IA32, 1756-IB16, 1756-IB16D, 1756-IB16I, 1756-IB16IF, 1756-IB32,
1756-IC16, 1756-IG16, 1756-IH16I, 1756-IM16I, 1756-IN16, 1756-IV16, 1756-IV32, 1756-OA8, 1756-OA8D, 1756-OA8E,
1756-OA16, 1756-OA16I, 1756-OB8, 1756-OB8EI, 1756-OB8I, 1756-OB16D, 1756-OB16E, 1756-OB16I, 1756-OB16IEF,
1756-OB16IEFS, 1756-OB16IS, 1756-OB32, 1756-OC8, 1756-OG16, 1756-OH8I, 1756-ON8, 1756-OV16E, 1756-OV32E,
1756-OW16I, 1756-OX81
User Manual

Table of Contents

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Allen-Bradley 1756-OB8 Specifications

General IconGeneral
Module TypeDigital Output
Number of Outputs8
Voltage Category24V DC
Slot WidthSingle Slot
Operating Voltage10…30V DC
Isolation Voltage1500V
Temperature Rating0…60 °C (32…140 °F)
Backplane Current Load100mA at 5V, 50mA at 24V
Operating Temperature0 to 60°C
CommunicationControlNet, EtherNet/IP
Compatibility1756 ControlLogix

Summary

Chapter 2 Digital I;O Operation in the ControlLogix System

Chapter 3 Common Module Features

Chapter 4 Diagnostic Module Features

Point-level Fault Reporting

Explains how diagnostic I/O modules set bits to indicate faults on a point-by-point basis.

Chapter 5 Fast Module Features

Response Time

Details screw-to-backplane response times for fast input and output modules.

Per Point Timestamping and Change of State

Describes recording timestamps in CIP Sync format for each input point and handling state changes.

Pulse Width Modulation

Describes Pulse Width Modulation (PWM) for precise control of output pulse trains.

Chapter 6 Install ControlLogix I;O Modules

Install the Module

Provides instructions for installing or removing a module while chassis power is applied (RIUP).

Connect the Wires

Guides on connecting wires to RTBs or using prewired interface modules (IFMs).

Install the Removable Terminal Block

Provides steps to install the RTB onto the module to connect wiring.

Chapter 7 Configure ControlLogix Digital I;O Modules

Create a New Module

Guides on adding a new local or remote I/O module within RSLogix 5000 software.

Connection Properties

Details defining controller-to-module behavior, including RPI, inhibiting, and fault settings.

Chapter 8 Wiring Diagrams

Wiring Diagrams

Provides detailed wiring diagrams for various ControlLogix digital I/O modules.

Appendix A Troubleshoot Your Module

Use RSLogix 5000 Software for Troubleshooting

Explains how RSLogix 5000 software alerts users to fault conditions and aids in troubleshooting.

Appendix B Tag Definitions

Appendix C Use Ladder Logic To Perform Run Time Services and Reconfiguration

Appendix D Choose a Correct Power Supply

Appendix E Motor Starters for Digital I;O Modules

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