4 Fault Isolation
4.3 Fault Isolation Concepts
R688 HPM High-Performance Process Manager Service 345
December 2020 Honeywell
Table 62 IOP Box Soft Failure Error Codes
Check which output is failing, then check the
hardware for that output. Replace the hardware
if required.
Internal stack usage in the 8051
processor is close to the limit.
Output loopback circuit is bad.
Replace the appropriate IOP card.
I/O Link processor cannot gain
access to the shared RAM. Input
conversion will be prohibited.
No external ac line is present in the
LLAI. The 6 Vac is used for power
noise cancellation.
Check optical coupler and associated fuse on
the backpanel. Check that the primary (left
side)Power Supply Module in the Power
System is installed and functional.
Bad plug-in module on the FTA.
Replace the plug-in module.
Test Volume Reference Failure. PV
is set to NAN by the IOP.
The FTA type and point configuration
are mismatched.
Replace the FTA type or reconfigure.
Zero Reference Volume failure.The
PV is set to NAN by the IOP.
LLAI reference junction value is bad.
Check that the reference junction wire or
jumper (P1) is correctly implemented on the
FTA.
Probable RAM failure in ADP portion.
Replace the LLAI IOP card for the LLAI FTA.
Bad configuration byte passed to the
ADP.
LLMux or RHMUX: FTA 1 has a Soft
failure.
LLMux or RHMUX: Check FTA 1.
SI: Correct the error condition at the device
connected to FTA 1.
LLMux or RHMUX: FTA 2 has a Soft
failure.
LLMux or RHMUX: Check FTA 2.
SI: Correct the error condition at the device
connected to FTA 2.
Calibration of an IOP card has been
aborted during the procedure.
Check the precision voltage/resistance source
for accuracy. Also, make sure that the correct
calibration procedure is being followed
Calibration reference input is bad.
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