Rockwell Automation 1747-DCM,D17476.8 Direct Communication Module - Manual (Page 54)

Chapter 7
Troubleshooting
7–2
If LED is: Cause: Corrective action:
On Normal State No action required.
Blinking
RIO scanner’s processor
in Program/Test Fault
Mode
Check for RIO scanner’s processor error, correct
condition, and cycle power to DCM.
RIO scanner’s processor
not connected to scanner
Check that the scanner is properly installed in rack (RIO
scanner’s processor–2, #3).
Off
RIO scanner’s processor
rack inhibited
Check RIO scanner’s processor rack integrity, correct any
problem, and cycle power to DCM.
No communication
Check that the baud rate of the DCM matches the baud
rate of the scanner.
No communication
between RIO scanner’s
processor and DCM
Check cable connections from the RIO scanner’s
processor or scanner to the DCM.
processor and DCM
Check that the DCM connector is properly installed.
Troubleshooting Using the
COMM LED (Green)