Rockwell Automation 1746-INT4 Thermocouple/MV Isolated/ User Manual - Manual (Page 69)

Publication 1746-UM614B-EN-P - September 2007
Module Diagnostics and Troubleshooting 69
Troubleshooting Flowchart
End
.
Yes
No
End
End
mV
thermocouple
No
Yes
.
No
Yes
.
Yes
No
Check LED
indicators on
module.
Module Status
LED indicator off.
Module Status
LED indicator on.
Channel Status LED
indicator(s) blinking.
Channel Status
LED indicator off.
Channel Status
LED indicator on.
Channel enabled
and working
properly.
Channel is not
enabled.
Enable channel if
desired by setting
channel config. word
(bit 11 = 1). Retry.
Fault condition.
Normal module
operation.
Module fault
condition.
Check to see that
module is seated
properly in chassis.
Cycle power.
Are faulted channels
configured for mV or
thermocouple input?
Is more than one LED
indicator blinking?
Check channel
status word
bits 12…15.
CJC fault has
occurred.
Check that wiring is secure at
both CJC assemblies and
that the temperature within
the enclosure is in the range
limits of the CJC sensor.
(Refer to page 9.) Retry.
Configuration error. Check
configuration word bits 0…3
for valid input type
configuration as well as bits
6 and 7 for valid configuration
setting. Retry.
Over-range condition exists.
The input signal is greater than
the high scale limit for the
channel or the CJC
connections. Correct and Retry.
Under-range condition exists.
The input signal is less than
the low scale limit for the
channel or the CJC
connections. Correct and Retry.
Is problem
corrected? Is problem
corrected?
Contact your local
distributor or
Allen-Bradley. Bit 12
set (1).
Bit 13
set (1).
Bit 14
set (1).
Bit 15
set (1).
An open-circuit condition is
present. Check channel and CJC
wiring for open or loose
connections. Retry.
Contact your local
distributor or
Allen-Bradley.
Contact your local
distributor or
Allen-Bradley.
Is problem
corrected?