2 Equipment Description
2.27 EUCN Cable System
156
HPM High-Performance Process Manager Service
R688
Honeywell
December 2020
Example 1: EST05 has a bad cable A. From the view of the Primary ENIM/ENB (using $FTESTS2
schematic) only the ES-T has a bad A->A, A->B status. From the view of the ES-T (as shown in
Figure 72), all nodes have bad A->A, B->A statuses except for the local node which also has A->B status
bad.
Figure 71 $FTESTS2 view
– EST05 has Cable A fault
Primary ENIM/ENB
Primary EHPM
Secondary ENIM/ENB
Secondary EHPM
EST05
Figure 72 FTE Status from view of EST05
– EST05 has Cable A fault
System Behavior
System behavior, especially controller redundancy, can be another useful diagnostic input. ENIM/ENB
and controllers use a similar redundancy philosophy. If a primary node loses both network connections
(both FTE A and FTE B) and the secondary status indicates that it is good, then the primary node will
fail and the secondary will take over. This failure requires that there be NO communication on either the
A or B connection as viewed by the local controller. If there is any received traffic on either FTE
interface, a failover will not take place.
If for instance, an L1 A switch is down and a B downlink to the primary EHPM is broken, it will appear
that the primary EHPM has a double cable fault – from the viewpoint of the ENIM/ENB and the node
will appear OFFNET. From the viewpoint of the primary EHPM however, the A path through the CF9
will be good and through that connection it can receive EUCN redundancy messages from its partner.
The primary EHPM will therefore not failover. Process control will be maintained by the Primary
EHPM although view and advanced control via the ENIM/ENB will be broken. Because the ENIM/ENB
has a view to the secondary EHPM, the ENIM/ENB will retain FULL control and when one of the faults
is corrected, view and advanced control will resume.
Содержание HPM
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