4 Fault Isolation
4.9 HPMM Alphanumeric Display
370 HPM High-Performance Process Manager Service R688
Honeywell December 2020
SWAP sequence (non- Detailed-Display mode)
If the Detailed Display mode is not enabled, then the swap sequence described on the previous page
would not display any of the test sequence numbers as listed in the following table for HPMM 1 and
HPMM 2.
Table 76 Alphanumeric Display for HPMM Swapping Sequence (Non-Detailed Display
Mode)
HPMM swap command received.
HPMM 1 begins RAM Retention startup diagnostics.
HPMM 1 completes RAM Retention startup diagnostics.
Secondary HPMM performs database synchronization
HPMM failover
In the event of an HPMM failover, the primary HPMM transitions to the Fail state and the secondary
HPMM becomes the primary.
Failover sequence (Detailed Display mode)
An example of a display sequence for a failover when a RAM parity error occurs with the Detailed
Display mode enabled is listed in the following table for HPMM 1 and HPMM 2.
Table 77 Alphanumeric Display for Failover HPMM Swapping Sequence (Detailed Display
Mode)
Flag -- Communications processor Hard failure code is next
HPMM 1 Communications processor failure: Local RAM
parity error
Flag -- Control processor Hard failure code is next
HPMM (file 1) Control processor failure: No response from
Communications processor.
Flag -- processor Hard failure code is next
HPMM 1 Communications processor failure: Local RAM
parity error
Flag -- Control processor Hard failure code is next
HPMM (file 1) Control processor failure: No response from
Communications processor
The above failure pattern repeats indefinitely or until the Detailed-display mode is
disabled.
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