R688 HPM High-Performance Process Manager Service 459
December 2020 Honeywell
8. Periodic Redundancy Tests
8.1 Overview
Introduction
This section describes the recommended periodic verification of the equipment’s redundancy where
applicable.
At an appropriate time, such as during a annual period of scheduled plant maintenance, the High-
Performance Process Manager subsystem’s availability can be improved by performing specific tests on
various hardware parts of the High-Performance Process Manager subsystem. During the tests, personnel
should be prepared for either proper operation or improper operation of the hardware. The preparation for
improper operation of the hardware during the tests yields the lowest Mean Time to Repair (MTR),
which is important when maximizing subsystem availability.
Even though fault coverage is high in the High-Performance Process Manager (HPM) during normal
operation, periodic redundancy testing provides additional fault coverage by exercising any hardware
that is not in use during normal operation.
8.2 HPMM Redundancy
Introduction
The ability of redundant HPMMs to swap positions, primary to secondary and secondary to primary, can
be confirmed by using display commands on the Universal Station.
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