ProSoft Technology MVI71-MNET - Manual (Page 55)

Diagnostics and Troubleshooting MVI71-MNET ♦ PLC Platform
User Manual Modbus TCP/IP Interface Module
ProSoft Technology, Inc.
Page 55 of 109
June 23, 2009
4.2.3 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.
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. Verify that all
modules in the rack are configured in the ladder logic.
Module Errors
Problem Description Steps to take
BP ACT LED 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:
ƒ The processor is in Run mode.
ƒ The backplane driver is loaded in the module.
ƒ The module is configured for read and write block data transfer.
ƒ The ladder logic handles all read and write block situations.
ƒ 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.