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5-4 Series 90™-70 Enhanced Hot Standby CPU Redundancy User's Guide
–
May 2000 GFK-1527A
5
Error
Code
Message Fault Description Corrective Action
9 Primary and Secondary
Units are Incompatible
The local unit cannot be placed in RUN
mode when its redundancy configuration is
incompatible with the remote unit. This
error is logged when (1) Store of an
incompatible configuration is attempted and
(2) attempting to synchronize with an
incompatible configuration. This error is
also logged when the local unit and/or the
remote unit has a C debugger session active
and the units are attempting to synchronize.
Modify the configuration or terminate
the C debugger session.
10 CPU to CPU
communications
terminated
Synchronization protocol has been violated. If this fault is also accompanied by an
RCM failed fault, replace the failed RCM:
otherwise power cycle the CPU or CPUs.
11 Redundant Link has timed
out
The RCM has timed out while waiting on
communications from the other unit.
Power cycle the back-up CPU (CPU not
controlling the process); increase the fail
wait time.
12 Units Are Not Fully
Synchronized
Due to actions taken by the user, the two
units in a CPU redundant system are not
fully synchronized. This means the backup
unit is not executing with the same inputs
and/or outputs as the active unit while the
units are synchronized due to data transfers
being disabled.
Enable the data transfer copy on the
backup unit
>12 CPU Redundancy Status
has Changed
A change in the status of the system has
occurred.
Corrective action to be taken depends on
the error code.
The following table lists messages, descriptions, and corrective actions for error codes associated
with redundancy in other fault groups.
Group Error
Code
Message Fault Description Corrective Action
Loss of
Option
Module
57 Redundant link hard
failure occurred.
The RCM has been faulted due to an
error while accessing memory.
Power cycle the rack with the
faulted RCM. If the RCM's
BOARD OK LED is on, replace
the cable between the RCM and
the BTM. If the RCM's BOARD
OK LED is off, replace the RCM.
PLC Software 148 Units contain
mismatched firmware;
update recommended.
The firmware in the redundant CPUs
has different revision levels. Having
different revisions of firmware in the
CPUs is intended for short-term
synchronization only as some change in
the behavior of the system may be
experienced when mixing revisions.
Upgrade the CPUs so that they
have the same revision of
firmware according to the
firmware upgrade procedure.