20 ProcessLogix and ControlLogix System Redundancy Module
Publication
1757-IN092E-EN-P - November 2007
If both modules are have power applied to simultaneously, the module with
the lowest serial number will be designated as the primary chassis and will
display PRIM on the module’s four-character display. In addition, the PRI
status indicator on the primary 1757-SRM module will be green. On the
1757-SRM module, the normally open (NO) contacts of the user relay will be
closed.
The secondary chassis displays either DISQ or SYNC, depending on the state
of the secondary chassis. In addition, the PRI status light on the secondary
1757-SRM module will not be illuminated. On 1757-SRM module, the NO
contacts of the user relay will be open.
Qualify the System
When you first apply power to the designated primary and secondary chassis,
the redundant system will begin to qualify them. During qualification, the
primary modules are compared with the secondary module partners to verify
that the hardware and firmware are compatible.
If the 1757-SRM module displays Then
SYNC after the chassis has been
started and qualified.
The chassis configuration and the firmware revision
levels are compatible.
DISQ
Important: The secondary
1757-SRM module will initially
display DISQ until it completes the
qualification process. This may take
1
…
3 minutes.
A problem exists:
• with the chassis configuration.
• with incompatible firmware revision levels
between the primary and secondary modules.
See Flowchart of Starting a Chassis with a
Healthy 1757-SRM Module on page 21.
• if the ControlNet-module partners’ Keeper
parameters are not the same.
• if the ControlNet MAC IDs are not set to the
same node address.
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