4 Fault Isolation
4.3 Fault Isolation Concepts
336 HPM High-Performance Process Manager Service R688
Honeywell December 2020
Errors logged against the HPMM’s I/O Link Interface drivers are added into the appropriate CABLE (A
or B) ERRORS and TOTAL ERROR counts which are displayed in the HPMM I/O Link Information
display. The mnemonic IOLDRVER is also displayed in the field that is labeled LAST
COMMUNICATION ERROR.
The normal cable swap algorithm annunciates a Soft failure and disables cable swap. Existing Soft
failure codes (#16 – I/O LINK CABLE A FAILURE and #17 – I/O LINK CABLE A FAILURE) are
used to report I/O Link Interface driver failures as well as other communications failures.
Some faults, for example power or ground shorts that produce an HPMM I/O Link Interface driver error
can also produce other I/O Link Interface errors such as the LOOPBACK error. When this occurs, the
IOLDRVER error may be obscured from the LAST COMMUNICATION ERROR field by another
error. Even though some errors may be obscured from the display, they are still recognized, logged, and
included in the error statistics.
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