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Troubleshooting
Using the FAULT LED (Red)
If LED is:
Cause:
On
Internal Fault
Flashing
Configuration
Error
Off
Normal State
(1)
The 1747-DCM cannot cross logical chassis boundaries. For example, configuring the module for ½ logical chassis with
starting group 6 causes a configuration error.
Using the COMM LED (Green)
If LED is: Cause:
On
Normal State
Flashing
RIO scanner's processor in
Program/Test/Fault mode
RIO scanner's processor not connected to
scanner
RIO scanner's processor chassis inhibited Check RIO scanner's processor chassis integrity,
Off
No communication between RIO
scanner's processor and 1747-DCM
Corrective Action:
Cycle power to the I/O chassis containing the 1747-DCM. Replace the
1747-DCM if red LED remains lit after power-up.
Check that the DIP switch settings are correct. Make sure that I/O group
and chassis size settings are compatible.
chassis address is correct.
No action required.
Corrective Action:
No action required.
Check for RIO scanner's processor error, correct
condition, and cycle power to the 1747-DCM.
Check that the scanner is properly installed in the
chassis.
correct any problem, and cycle power to the
1747-DCM.
Check that the baud rate of the 1747-DCM matches
the baud rate of the scanner.
Check cable connections from the RIO scanner or its
processor to the 1747-DCM.
Check that the 1747-DCM connector is properly
installed.
Direct Communication Module
(1)
Also see that the setting for
Publication 1747-IN005B-EN-P - March 2003
15
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