Diagnostics and Troubleshooting MVI56E-GSC/GSCXT ♦ CompactLogix or MicroLogix Platform
User Manual Enhanced Generic ASCII Serial Communication Module
Page 70 of 140 ProSoft Technology, Inc.
April 24, 2017
3.8 Non-Scrolling LED Status Indicators
The non-scrolling LEDs indicate the module’s operating status as follows:
The module is not receiving adequate power or is not securely
plugged into the rack. May also be OFF during configuration
download.
The MVI56E-GSC is working normally.
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
The module is not receiving adequate power or is not securely
plugged into the rack.
The module is operating normally.
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.
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.
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