26 ProcessLogix and ControlLogix System Redundancy Module
Publication
1757-IN092E-EN-P - November 2007
Chassis State Status Indicator
The Chassis State status indicator identifies whether or not the chassis is
primary.
1757-SRM Module Fault Codes and Display Messages
The 1757-SRM module faults fall into four categories.
Status Conditions
Off • No power has been applied to the 1757-SRM module.
• The 1757-SRM chassis state is in secondary or failed state.
Green < 1 second Powerup with partner 1757-SRM module determining primary state.
Solid green 1757-SRM chassis state is in a primary state.
Fault Type Description
Minor Recoverable • The fault does not stop redundancy operations and
provides you with a recovery mechanism.
• The 1757-SRM module may clear some minor
recoverable faults on its own.
Minor Nonrecoverable • The fault does not stop redundancy operations.
• No recovery mechanism is available.
Major Recoverable The fault will impact redundancy operations, although the
effect may not be immediate.
For example, if the fault occurred in the secondary 1757-SRM
module, it may not affect control until the primary 1757-SRM
module fails.
Major Nonrecoverable • The fault is a critical fault. Redundancy operations will
cease.
• A switchover may occur.
• No recover mechanism is available.
• The module may need to be replaced.
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