Allen-Bradley 1757-SRM Redundancy module

Allen-Bradley 1757-SRM Redundancy module

Description

Redundancy requires no additional programming and is transparent to any devices connected over an EtherNet/IP or ControlNet network. Redundancy uses 1757-SRM modules to maintain communication between the pair of redundant chassis.

The 1757-SRM modules keep communication between the primary and secondary chassis.

• Unless you are updating controller revisions, do not download the project to the secondary controller. While the secondary controller is synchronizing with the primary controller, the 1757-SRM modules automatically let the primary controller transfer the project to the secondary controller.

• Once the secondary controller is synchronized, the 1757-SRM modules keep the controller synchronized by providing the path for crossloading any changes that occur in the primary controller. These changes include:

– online edits.

– force values.

– changes to properties.

– changes to data.

– results of logic execution.

1757-SRM module:

 • 1 in each redundant chassis

• Needs 2 slots

• Needs 1757-SRCx cable [1 m (3 ft), 3 m (9 ft), 10 m (30 ft), 50 m (150 ft), and 100 m (300 ft)]

Technical Specifications