ProSoft Technology MVI56E-GSC/ GSCXT - Manual (Page 74)

Diagnostics and Troubleshooting MVI56E-GSC ♦ CompactLogix or MicroLogix Platform
User Manual Enhanced Generic ASCII Serial Communication Module
Page 74 of 140 ProSoft Technology, Inc.
May 9, 2014
LED Label Color Status Indication
RED The most common cause is that the module has detected a
communication error during operation of an application port.
The following conditions may also cause a RED LED:

The firmware is initializing during startup
 The firmware detects an on-board hardware problem
during startup
 Failure of application port hardware during startup
 The module is shutting down
 The module is rebooting due to a ColdBoot or WarmBoot
request from the ladder logic or Debug Menu
OK Red or
Green OFF The module is not receiving adequate power or is not securely
plugged into the rack.
GREEN The module is operating normally.
RED The module has detected an internal error or is being
initialized. If the LED remains RED for over 10 seconds, the
module is not working. Remove it from the rack and re-insert it
to restart its internal program.
ERR Red Not used.
3.9 ControlLogix Processor Not in RUN or REM RUN
Whenever the module detects that the processor has gone out of the RUN mode
(that is, the processors faults or is set to PGM (Program mode), the application
ports can be shut down as prescribed in the user configuration. When the
processor is returned to a running state, the module will resume communication
on the serial networks.
3.10 Clearing a Fault Condition
Typically, if the OK LED on the front of the module turns RED for more than ten
seconds, a hardware problem has been detected in the module or the program
has exited.
To clear the condition, follow these steps:
1 Turn off power to the rack.
2 Remove the card from the rack.
3 Verify that all jumpers are set correctly.
4 If the module requires a Compact Flash card, verify that the card is installed
correctly.
5 Re-insert the card in the rack and turn the power back on.
6 Verify correct configuration data is being transferred to the module from the
ControlLogix controller.
If the module's OK LED does not turn GREEN, verify that the module is inserted
completely into the rack. If this does not cure the problem, contact ProSoft
Technology Technical Support.