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Allen-Bradley 1756-L55 User Manual

Allen-Bradley 1756-L55
186 pages
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ControlLogix
Redundancy
System
Catalog Numbers 1756-CNB/D/E,
1756-CNBR/D/E, 1756-ENBT,
1756-EWEB, 1756-L55,
1756-L55M12, 1756-L55M13,
1756-L55M14, 1756-L55M16,
1756-L55M22, 1756-L55M23,
1756-L55M24, 1756-L61, 1756-L62,
1756-L63, 1757-SRM
User Manual

Table of Contents

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Allen-Bradley 1756-L55 Specifications

General IconGeneral
Number of Tasks32
Shock30 g
Controller TypeControlLogix
SeriesControlLogix
I/O Capacity128, 000 I/O
CommunicationEtherNet/IP, ControlNet, DeviceNet
Communication PortsRS-232
Operating Temperature0…60 °C (32…140 °F)
Relative Humidity5 to 95% non-condensing

Summary

Chapter 1 ControlLogix Redundancy System Overview

Chapter 2 Design the System

Chapter 3 Install the System

Chapter 4 Configure the System Redundancy Module

Opening the SRM Configuration Tool

Details the steps to start and access the SRM configuration tool via RSLinx software.

Checking SRM Configuration Tool Revision

Guides users on verifying the SRM configuration tool revision for compatibility with the redundancy system.

Testing a Switchover Manually

Explains how to use RSLinx software to manually initiate and monitor a switchover.

Chapter 5 Configure and Program the Controller

Plan for Online Edits

Addresses decisions before editing online: retaining test edits, finalizing edits, and memory allocation.

Configure a Controller for Redundancy

Details the process of enabling redundancy for ControlLogix controllers in RSLogix 5000 software.

Configuring Communications

Outlines specific configuration choices for successful redundancy system communications, including I/O and tags.

Estimate the Crossload Time of a Program

Provides methods to estimate the time required for crossloading program data between controllers.

Maintain Data Integrity During a Switchover

Explains how the redundancy system ensures bumpless switchovers and manages data crossloads.

Determine the Status of Your Redundant System

Shows how to write code to determine the system's redundancy status using GSV instructions.

Schedule a ControlNet Network

Guides users through scheduling new or updating existing ControlNet networks for redundancy.

Chapter 6 Maintain and Troubleshoot the System

Diagnosing Switchovers and Disqualifications

Provides procedures to find and fix causes of unplanned switchovers or loss of synchronization.

Troubleshooting Synchronization Failures

Offers steps to resolve issues when a secondary chassis fails to synchronize.

Interpreting SRM Event Log Entries

Explains how to interpret SRM event log entries to understand system switchovers or synchronization failures.

Optimizing Communication Performance

Addresses slow HMI updates or communication issues by adjusting system overhead time slices.

Chapter 7 Update Modules and Redundant Systems

Changing CNB Modules from Series D to E Online

Details the procedure for replacing CNB/D/D modules with Series E modules while the system is online.

Appendix A Set Up EtherNet/IP Communication Across Subnets

Appendix B Convert an Existing System to Redundancy

Appendix C Attributes of the Redundancy Object

Appendix E Redundant System Restrictions

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