Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 105)

Publication 1746-UM008B-EN-P - December 2006
Module Diagnostics and Troubleshooting 105
Troubleshooting Flowchart
.
.
.
.
.
Check LED
indicators on
module.
Module Status
LED indicator is off. Module Status
LED indicator is on.
Channel Status
LED indicators
blinking Channel Status
LED indicator
is off. Channel Status
LED indicator
is on.
Module fault
condition. Normal module
operation.
Check to see
that module is
seated properly
in chassis.
Cycle power.
Fault
condition.
Check channel
status word
bits 13...15.
Channel is
not enabled. Channel is enabled
and working
properly.
End
End
End
Enable channel if
desired by setting
channel config.
word (bit 11 = 1).
Retry.
Bit 15
set (1)
Bit 14
set (1)
Bit 13
set (1)
Configuration error. Check
configuration word bits 0...3
for valid input type
configuration bits 13 and 14
for valid scale select setting:
and bits 6 and 7 for valid
Broken Input select setting.
Retry.
Out-of-range error indicating
that either an over range or
under range condition exists.
For over range, the input
signal is greater than the
high scale limit for the
channel. For under range,
the input signal is less than
the low scale limit for the
channel. Correct and retry.
Is problem
corrected?
Is problem
corrected?
Contact your local
distributor or
Rockwell
Automation.
Contact your local
distributor or
Rockwell
Automation.
Yes
Yes
No
No
An open-circuit or
short-circuit (RTD) condition
is present. Check channel
for open or loose
connections (RTD and
potentiometer inputs) and
check channel for
short-circuit condtion (RTD
only). Retry.