Allen-Bradley ControlLogix Manual do Utilizador descarregar pdf (Página 175)

Rockwell Automation Publication 1756-UM001O-EN-P - October 2014 175

Chapter 12

Redundant Systems

ControlLogix Redundancy

Overview

Redundancy provides more system availability by switching control to a

secondary controller chassis if a fault occurs in the primary controller chassis.

The redundant system switches control from the primary to the secondary when

these faults occur:

• Power loss to primary chassis

• Hardware or firmware failure of any module in the primary chassis

• A major fault in the user program on the primary controller

• Loss of communication between the primary chassis and remote

ControlNet or EtherNet/IP modules

• Disconnection of an Ethernet patch cable from an EtherNet/IP

communication module in the primary chassis

• Removal or insertion of any module in the primary chassis

• A user command that causes a switchover

Topic Page

ControlLogix Redundancy Overview 175

System Requirements 177

System Considerations 178

Build a Redundant System 179

ControlNet Considerations in Redundant Systems 180

EtherNet/IP Considerations in Redundant Systems 180

Redundancy and Scan Time 181

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Allen-Bradley ControlLogix Manual do Utilizador Página 175