Rockwell Automation 1746-NI16V SLC 500 Analog Input Modules User Manual - Manual (Page 76)

Publication 1746-UM001A-US-P
6-6 Module Diagnostics and Troubleshooting
Troubleshooting Flowchart
Check LEDs
on module.
Module Status
LED off
Module Status
LED on
Channel Status
LED(s) blinking
Channel Status
LED off.
Channel Status
LED on.
Module fault
condition Fault Condition
Channel is not
enabled.
Channel enabled
and working
properly.
Check to see that
module is seated
properly in chassis.
Cycle power.
End
Check channel
status word
bits 15-13.
Enable channel if desired
by setting channel
configuration word
(Bit 15 = 1). Retry.
End
Status
Bits (15 to
13)
Pattern (011)
Configuration error. Check
configuration word for bits 8 to
6 for valid data format
configuration. Correct and
retry.
Under-range condition exists.
The input signal is less than
the low scale limit for the
channel. Correct and retry.
Is problem
corrected? Yes
End
Is problem
corrected?
Yes
No
Over-range condition exists.
The input signal is greater than
the upper scale limit for the
channel. Correct and retry.
Contact your
local distributor
or Allen-Bradley.
No
An open-circuit condition is
present. Check channel and
wiring for open or loose
connections. Correct and retry. Contact your
local distributor
or Allen-Bradley.
Status
Bits (15 to
13)
Pattern (101)
Status
Bits (15 to
13)
Pattern (110)
Status
Bits (15 to
13)
Pattern (100)