4 Fault Isolation
4.6 Redundant Analog Output IOP Failure Diagnosis
R688 HPM High-Performance Process Manager Service 353
December 2020 Honeywell
OK/CNF [S] status
If the HPM Status display indicates an OK/CNF [S]* status, or any combination of SF, IDL, or ISF for
IOP A, the problem is either the cables are improperly wired to the FTA, or the FTA switching module is
bad. Do not attempt to disrupt power to IOP A by toggling its upper retractor or remove the IOP.
Additional information may be available in the “Status” field on the IOP’s Detail Status display.
* The [S] represents the synchronization status of the redundant IOP pair. The “S” has two
background colors, red for SYNC_FAIL and yellow for SYNC_WARNING. A SYNC_FAIL
status indicates the IOP has tried several times to synchronize the database between the IOPs with
no success. The only way to reinitiate a synchronization for the IOP with a CFG status, from the
Universal Station, is to send the present state of the communicating IOP to its redundant partner. For
example, if the HPM Status display indicates OK/CFG [S], execute the RUN command for the pair.
If the status is IDL/CFG [S], execute the IDLE command. You will see the red “S” change color to
yellow as synchronization of the IOPs is attempted again.
Replacing the switching module
If it is determined that the switching module is bad, the switching module can be replaced without
disturbing the field outputs, as long as IOP A is the primary IOP.
[S] CNF/OK status
If the HPM Status display indicates a *[S] CNF/OK status, or any combination of SF, IDL, or ISF for
IOP B, the problem is either the cables are improperly wired to the FTA, or the switching module on the
FTA is defective. If any of the FTA outputs are in the “on” state, a special problem exists because the
removal of the switching module will result in the loss of control output to the device.
* The [S] represents the synchronization status of the redundant IOP pair. The “S” has two
background colors, red for SYNC_FAIL and yellow for SYNC_WARNING. A SYNC_FAIL
status indicates the IOP has tried several times to synchronize the database between the IOPs with
no success. The only way to reinitiate a synchronization for the IOP with a CFG status, from the
Universal Station, is to send the present state of the communicating IOP to its redundant partner. For
example, if the HPM Status display indicates OK/CFG [S], execute the RUN command for the pair.
If the status is IDL/CFG [S], execute the IDLE command. You will see the red “S” change color to
yellow as synchronization of the IOPs is attempted again.
Best solution when replacing switching module
The best solution is to use the Analog Output Standby Manual device to hold the field outputs in a safe
state while the IOP or switching module is replaced.
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