ProSoft Technology MVI69-GSC - Manual (Page 58)

Diagnostics and Troubleshooting MVI69-GSC ♦ CompactLogix or MicroLogix Platform
User Manual Generic ASCII Serial Communication Module
Page 58 of 102 ProSoft Technology, Inc.
September 24, 2010
4.1.2 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.
Verify that the slot in the rack configuration has been set up correctly in
the ladder logic.
Processor I/O LED
flashes
This indicates a problem with backplane communications. Verify that all
modules in the rack are configured in the ladder logic.
Module has a power supply distance rating of 2 on Compact Logix. The
module must be within 2 slots of the power supply on Compact Logix, or
that the MicroLogix backplane can supply the 800ma required for the
module.
Module Errors
Problem Description Steps to take
BP ACT LED remains
off or blinks slowly
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 mode
The backplane driver is loaded in the module
The module is configured for read and write block data transfer
The ladder logic handles all read and write block situations
The module is configured in the processor
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 the card in the rack, and then restore power to the rack.