R688 HPM High-Performance Process Manager Service 391
December 2020 Honeywell
5. UCN Exerciser
5.1 Overview
Purpose
This section covers the operation of the UCN Exerciser program that is used for isolating
communications problems in a UCN node.
The UCN Exerciser is an off-process program intended to provide a level of confidence in
the connectivity and communication capabilities of an installed network. This test must
not be used for an on-process system because the added communication and CPU loads
induced by the test may cause throughput and response time degradation of the control
system. The test works best if the physical node states of the participating configured
nodes do not change during the duration of the test.
Each node must be configured in the NIM to participate in either test.
More than one logical UCN can normally be configured for a single physical UCN. The UCN Exerciser
program must be configured to include, for test, only NIMs (and their redundant partners) from the same
logical UCN. Configuring NIMs from more than one logical UCN will cause false errors to be indicated
for some of the NIMs. This restriction does not apply to for other UCN node types, such as a High-
Performance Process Manager, Advanced Process Manager, Process Manager, or Logic Manager.
5.2 Applications
Purpose
The purpose of the UCN Exerciser is:
ï‚· To provide the user with confidence that the UCN is operating properly by sending messages
between UCN nodes.
ï‚· To test the peer-to-peer communications path. The status of peer-to-peer communications between
High-Performance Process Managers is not shown on the Universal Station (US) display.
ï‚· To provide a means of isolating communication problems to a certain High-Performance Process
Manager by observing the gross level of errors detected.
Two part test
The test has two parts, an RDR test and a Triangulation test, with both performed in succession
repeatedly until the test is halted.
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