Rockwell Automation SA3100 Diag,Troublesht,Startup,Guide - Manual (Page 58)

B-4 Diagnositics, Troubleshooting, and Start-Up Guidelines
PMI Communication Warning Bit 15
The PMI Communication Warning bit is set if
a fiber-optic communication error is
detected between the PMI Processor
module and the UDC module. Hex Value: 8000H
Sug. Var. Name: WRN_COM@
Access: Read only
UDC Error Code: N/A
LED: N/A
Communication errors in two consecutive messages will result in a drive fault.