ABB DSBB 175 Logic conversion module

Clearing a Fault Condition Typically, if the OK LED on the front of the module becomes illuminated red for more than ten seconds, a hardware problem has been detected in the module or the program has exited. To attempt to clear the condition: 1 Remove the card from the rack and re-insert the card in the rack 2 Verify the configuration data being transferred to the module from the ControlLogix processor If the module's OK LED does not turn green, make sure the module is inserted completely into the rack. If this does not cure the problem, contact ProSoft Technology Support.

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.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 MVI56-EGD. Verify that all modules in the rack are correctly configured in the ladder logic.

Steps to take

 BP ACT LED (not present on MVI56E modules) remains OFF or blinks slowly MVI56E modules with scrolling LED display: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. 

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