Rockwell Automation AB quality Allen-Bradley 1746-INT4 User Manual page 69

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