Allen-Bradley 1756-CNB User Manual

5 Publication 1756-UM523F-EN-P - December 2006
Table of Contents
Preface Purpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Who Should Use this Manual. . . . . . . . . . . . . . . . . . . . . . . . 11
When to Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 11
How to Use this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 1
ControlLogix Redundancy System
Overview
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
About the Main Parts of a Redundant System . . . . . . . . . . . . 14
Firmware Combinations That Make Up a Redundant System . 14
Important Terms in a Redundant System . . . . . . . . . . . . . . . 15
Primary Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Switching from One Controller to Another . . . . . . . . . . . . . . 15
Network Access Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bump in Outputs During a Switchover. . . . . . . . . . . . . . . . . 16
Keep the Second Controller Up to Date . . . . . . . . . . . . . . . . 16
Making Online Edits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Increasing Scan Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Network Addresses During a Switchover . . . . . . . . . . . . . . . 18
ControlNet Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
EtherNet/IP Network . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Quick Start Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 2
Design the System
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Laying Out the System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Placement of a Pair of Redundant Chassis . . . . . . . . . . . . . . 30
If You Need More Than 100 Meters Between Chassis . . . 30
Placement of the I/O. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Placement of Operator Interface Terminals. . . . . . . . . . . . . . 32
Additional Redundant Components . . . . . . . . . . . . . . . . . . . 33
Redundant ControlNet Media . . . . . . . . . . . . . . . . . . . . . 33
Redundant Power Supplies. . . . . . . . . . . . . . . . . . . . . . . 34
Checking Connection Requirements. . . . . . . . . . . . . . . . . . . 35
Planning a ControlNet Network . . . . . . . . . . . . . . . . . . . . . . 35
Planning an EtherNet/IP Network . . . . . . . . . . . . . . . . . . . . 38
Worksheet for IP Swapping . . . . . . . . . . . . . . . . . . . . . . 39
How an EtherNet/IP Module Handles a Cable Break . . . . 40
Additional Design Considerations . . . . . . . . . . . . . . . . . . . . 41
Chapter 3
Install the System
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Preliminary Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Install the Chassis for the Controllers . . . . . . . . . . . . . . . . . . 45
Install Modules in the First Redundant Chassis . . . . . . . . . . . 46
Install Modules in the Second Redundant Chassis . . . . . . . . . 48

Allen-Bradley 1756-CNB Specifications

General

Brand	Allen-Bradley
Model	1756-CNB
Category	Control Systems
Language	English