Communication Diagnostics; Redundant Overview; Table 25 Redundant Overview - Honeywell 900 User Manual

Main Menu
Diagnostics

Communication Diagnostics

This links to the main Communications menu. See page 20.

Redundant Overview

This display summarizes the status of all of the major components of a redundant system.
Item Status
RESERVE RESERVE
STATUS AVAILABLE
RESERVE NOT
AVAILABLE
REDUNDANCY
GOOD
STATUS
NO RSM MODULE
DETECTED
RSM SWITCH IS
BAD
48

Table 25 Redundant Overview

Possible Cause
Normal operation N/A
b)
1. Reserve not The lead controller
installed in rack. will continue to
control the process,
2. Power not applied
but failover is not
to reserve CPU
possible.
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
a)
Normal operation N/A
Switch on RSM is set The controller will
between two positions. continue to operate
with a missing RSM.
Automatic failover is
RSM Module is not
still possible if
inserted
required.
RSM Module has failed
Switch is indicating an The controller will
invalid position continue to operate
with a bad RSM.
Automatic failover is
still possible if
required.
900 Control Station User Guide
Communication Diagnostics
Controller Action
N/A
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.
N/A
Make sure switch is in desired
position
Install RSM module
Replace RSM
c) Replace RSM
What to do
Revision 9
May 2014