ProSoft Technology MVI71-GEC - Manual (Page 35)

MVI71-GEC ♦ PLC 5 Platform Diagnostics and Troubleshooting
Generic ASCII Ethernet Communication Module User Manual
ProSoft Technology, Inc. Page 35 of 86
May 11, 2011
4.1.2 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
PLC 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.
4.1.3 Troubleshooting
Use the following troubleshooting steps if you encounter problems when the
module is powered up. If these steps do not resolve your problem, please contact
ProSoft Technology Technical Support.
Processor Errors
Problem description Steps to take
Processor fault Verify that the module is plugged into the slot that has been configured
for the module in the I/O Configuration of RSLogix.
Verify that the slot location in the rack has been configured correctly in
the ladder logic.
Processor I/O LED
flashes This indicates a problem with backplane communications. A problem
could exist between the processor and any installed I/O module, not just
the MVI71-GEC. Verify that all modules in the rack are correctly
configured in the ladder logic.
Module Errors
Problem description Steps to take
BP ACT LED (not
present on MVI56E
modules) remains OFF
or blinks slowly
MVI56E modules with
scrolling LED display:
<Backplane Status>
condition reads ERR
This indicates that backplane transfer operations are failing. Connect to
the module’s Configuration/Debug port to check this.
To establish backplane communications, verify the following items:


The processor is in RUN or REM RUN mode.

The backplane driver is loaded in the module.

The module is configured for read and write data block transfer.

The ladder logic handles all read and write block situations.

The module is properly configured in the processor I/O configuration
and ladder logic.
OK LED remains RED The program has halted or a critical error has occurred. Connect to the
Configuration/Debug port to see if the module is running. If the program
has halted, turn off power to the rack, remove the card from the rack and
re-insert it, and then restore power to the rack.