4 Fault Isolation
4.2 Failure Types
302 HPM High-Performance Process Manager Service R688
Honeywell December 2020
HPMM Hard failure
An HPMM Hard failure forces the HPMM into the FAIL state. In this state, the HPMM executes only
from its failure executive and acts only as a responder on the UCN. Note that if there is a fault in the
High-Performance Comm/Control or the High-Performance I/O Link card in the primary HPMM, and
the HPMM is redundant, the faulty HPMM enters the FAIL state and the HPM operations switch to the
redundant partner HPMM.
If an HPMM does not have a redundant partner and a Hard failure occurs in the control processor on the
High-Performance Comm/Control card, the communications processor on the High-Performance
Comm/Control card annunciates the appropriate Hard failure code, and the HPMM degrades to the Soft
failure state. In this case, no control execution is being performed, but the LCN/UCN view to the IOPs is
maintained.
An HPMM Hard failure is indicated by a FAIL status on the HPMM Detail Status display. It is also
visible as a Fxxx state in the HPMM alphanumeric display window. HPMM Hard failure error codes are
indicated on the HPMM Detail Status displays for the High-Performance Comm/Control and
High-Performance I/O Link card processors. These same Hard failure error codes are also available
through the appropriate use of the HPMM alphanumeric display and its associated display switch behind
the bezel door at the front of the High-Performance Comm/Control card.
HPM Partial failure
In most cases, an HPM Partial failure indicates that a minor fault has been detected in an HPM, and the
HPM continues to control the process. A Partial failure can be caused by an HPMM Soft failure, IOP
Hard failure, or an IOP Soft failure as described below. The HPMM Partial failure is indicated by a
status of PARTFAIL, PF_IDLE, PF_IOIDL, or BKUP_PF on the UCN Status display. The PF_IDLE
and PF_IOIDL Partial failures indicate that a Partial failure was detected while the HPMM, or at least
one of the IOPs, is in the idle condition. Some Partial failures may cause failover between redundant
HPMMs, while others can cause redundant IOP failover.
HPMM Soft failure
In most cases, an HPMM Soft failure indicates that a minor fault, such as a timeout or overflow
condition, has been detected in the internal diagnostics or that a parity checker has failed. The HPMM
Soft failures appear in system event messages and on the HPMM Detail Status display. More detailed
information is available when the SOFT FAILURE target on the HPMM Maintenance Support display
is selected. Note that a Control processor Hard failure on the High-Performance Comm/Control card in a
nonredundant HPMM appears as a SOFTFAIL on the display, even though this is a major failure and
control is interrupted.
IOP Hard failure
An IOP Hard failure indicates that a Hard failure has occurred in an IOP card. The background
(embedded in the operating personality) internal diagnostics in an IOP card are used to test the card’s
functions and report the status of the IOP, using Hard and Soft failure error codes. When a Hard failure
occurs, the IOP card fails (stops operations), and its status becomes NR (No Response).
The only possible recovery from this type of failure is to recycle power on the failed IOP by unlocking
and lifting/lowering the upper card lever. If the failure still exists, the IOP will fail again.
Restart of an output IOP after a power loss (or manual power recycle) results in analog output channels
going to a nonpowered state, and digital output channels are set to off. Reloading of the IOP data base is
then required.
IOP Soft failure
An IOP Soft failure indicates that a Soft failure, such as an single slot/channel input/output failure, has
been detected in an IOP card by the IOP's internal diagnostics. The IOP Soft failures appear in system
event messages and on the IOP Detail Status display.
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