Table 22 I/O Module Error Status - Honeywell 900 User Manual

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Diagnostics
I/O Module Error Status
Status Possible Cause
HI CJ TEMP
Possible causes of
this diagnostic are:
1. One of the two CJs
on the module is
indicating a
temperature reading
greater than 70
degrees C.
2. Both cold-junction
sensors are failing to
convert.
3. The CJs are
converting properly,
but their differential is
greater than 10
degrees C.
MISMATCH The installed module
does not agree with
the module required
for the control
strategy downloaded
in the configuration
file.
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Table 22 I/O Module Error Status

Controller Action
1. Associated AI blocks that are configured
as T/Cs set their fail pin on, their warn pin
off, and their output pin to the failsafe value.
2. Associated AI blocks that are configured
as T/Cs set their IO status to "CJ High
Temperature" for reason 1 or "CJ Failure"
for possible causes 2 and 3.
3. Associated rack monitor block's module
fail pin is turned on.
4. Associated rack monitor block's RACK
OK pin is turned off.
5. Associated rack monitor block's
HITEMP pin is turned on.
6. SYSTEM MONITOR block's HITEMP
pin is turned on.
7. SYSTEM MONITOR block's HW OK
pin is turned off.
1. Associated blocks set their fail pin on,
their warn pin off, and their output pin to the
failsafe value.
2. Associated blocks set their IO status to
"Channel No Comm".
3. Associated rack monitor block's module
fail pin is turned on.
4. Associated rack monitor block's RACK
OK pin is turned off.
5. SYSTEM MONITOR block's HW OK
pin is turned off.
900 Control Station User Guide
I/O Module Diagnostics and I/O Calibration
What to do
1. Improve ventilation to rack
2. Replace AI module
1. Verify configuration
2. Replace module with the correct one.
Revision 9
May 2014