4 Fault Isolation
4.3 Fault Isolation Concepts
R688 HPM High-Performance Process Manager Service 319
December 2020 Honeywell
Table 58 Communications and Control Processor Hard Failure Codes
Corrective Action
(See Table 57)
Unexpected I/O Link card interrupt
UTBC Private RAM initialization test
failure
Bad File address/parity jumper setting
Bad Slot address/parity setting
I/O Link RAM parity circuitry test
failure
I/O Link timeout during transition to
Idle
I/O Link failed to transition to Idle
I/O Link timeout during transition to
Run
I/O Link failed to transition to Run
Global DRAM refresh circuitry failure
Bad software personality checksum
Access to non-existent memory error
Unacknowledged BERR Source bits
set
Comm/Control serial EEPROM write
test failure
I/O Link card serial EEPROM write test
failure
UCN l/F card serial EEPROM write
test failure
RTBC host interface test failure
RTBC internal loopback test failure
RTBC RX internal loopback test failure
RTBC TX internal loopback test failure
RTBC interrupt test failure
RTBC corrupted frame descriptor
RTBC Buffer Descriptor pool empty
RTBC Frame Descriptor pool empty
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