Honeywell 900 - Table 27 Details of Lead or Reserve CPU Diagnostics Error Status Messages

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Lead/Reserve CPU Diagnostics Diagnostics
Revision 9 900 Control Station User Guide 57
May 2014
Table 27 Details of Lead or Reserve CPU diagnostics error status messages
Class Status Possible Cause Controller Action Fix
RESERVE
STATUS
RESERVE
AVAILABLE
Normal operation N/A N/A
RESERVE NOT
AVAILABLE
1. Reserve not installed
in rack.
2. Power not applied to
reserve CPU
3. Neither lead nor
reserve CPU has a
valid configuration
database
4. Firmware mismatch
(lead and reserve
CPUs have different
firmware revisions
5. Database not
synchronized with
the lead
The lead controller
will continue to
control the process,
but failover is not
possible.
Install reserve CPU
Apply power to reserve CPU
Download a configuration and cold
start the controller
Perform a firmware upgrade so
both CPUs have the same version
Replace the reserve CPU. If this
doesn’t help, replace the lead
CPU. If this doesn’t help, replace
the backplane.