4 Fault Isolation
4.3 Fault Isolation Concepts
R688 HPM High-Performance Process Manager Service 335
December 2020 Honeywell
Table 58 Communications and Control Processor Hard Failure Codes
Corrective Action
(See Table 57)
MTOS task start returned bas status.
MTOS task priority change failed.
Default scan rate fails data owner
checks.
Default number of slots fails data
owner checks.
Largest slot db too big for tracked
RAM.
Actual slot size greater than slot size
constant.
Slot plus sequence program database
is less than the total number of
memory units reserved.
ATTENTION
The HPM I/O Link Interface periodically monitors the integrity of each resident driver circuit on
the I/O Link Interface. This capability did not exist until the introduction of the HPM. There is a
possibility that upgrading to an HPM from a PM or APM, while retaining the existing IOPs, could
uncover some marginal link drivers. These marginal IOP I/O Link Interface drivers, although still
able to function, will generate I/O Link Interface driver errors and the accompanying Soft
failures.
If no I/O Link Interface driver errors are reported, then all the drivers on the I/O Link Interface are
operating properly. If I/O Link Interface driver errors exist, the offending IOP or High-Performance I/O
Link card(s) should be replaced.
Errors that are logged against the I/O Link Interface resident IOP drivers are added to that IOP’s (A or B)
error count in the IOM I/O Link Information display. The mnemonic IOLDRVER is also displayed
according to the IOP’s DSA under the column that is labeled LAST ERR.
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