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Main Menu
Diagnostics
Lead/Reserve CPU Diagnostics
56
900 Control Station User Guide
Revision 9
May 2014
Item
Status
Possible Cause
Controller Action
Fix
PROTOCOL
MISMATCH
The firmware version in
the controller CPU is
not compatible with the
firmware version in the
I/O scanner
Controller continues
to run but is not able
to access the I/O on
the associated rack
Upgrade the firmware in the CPU
and/or scanner to be compatible
versions
RESERVE I/O
COMM
STATUS
NO
COMMUNICATIONS
Possible causes are
defined by the
RESERVE I/O COMM
DIAG that is being
reported.
Controller continues
to run but is not able
to access the I/O on
the associated rack
See the fix defined for the
RESERVE I/O COMM DIAG that
is being reported.
MARGINAL: PORT
I/O A
Rack communication
with CPU-A is
experiencing a high
error rate
Controller continues
to run but is
marginally
accessing the I/O
on the associated
rack
1. Check cable shielding for
proper grounding and noise
immunity.
2. Check connectors of all
cables.
3. If a hub/switch is being used,
verify that it is one that is
recommended by Honeywell
4. Replace cables.
MARGINAL: PORT
I/O B
Rack communication
with CPU-B is
experiencing a high
error rate
Controller continues
to run but is
marginally accessing
the I/O on the
associated rack
1. Check cable shielding for
proper grounding and noise
immunity.
2. Check connectors of all
cables.
3. If a HUB/switch is being used,
verify that it is one that is
recommended by Honeywell
4. Replace cables.
GOOD: PORT I/O A Normal operation
N/A
N/A
GOOD: PORT I/O B Normal operation
N/A
N/A
NOT USED IN THIS
CONFIGURATION
None of the I/O
modules contained in
this rack are being
used to execute the
control configuration
that is currently running
in the controller.
N/A
N/A
I/O MODULE
DIAGNOSTICS
GOOD
The detailed information for the I/O MODULE DIAGNOSTICS entry in
the table above is also shown in Table 19 in the main part of the manual,
under the “I/O” Class.
MODULE ERROR
MODULE HI CJ
TEMP
FAILURE
NO COMM
BAD VERSION
Lead/Reserve CPU Diagnostics
These displays show the status of the Lead and Reserve CPU modules in the redundant system. The same
categories of status information are shown for Lead or Reserve. The CPU Position parameter on each
display identifies which physical CPU module is currently acting as the Lead or Reserve.
Refer to Table 27 through for a description of the information contained on these displays.