[Fews] Sniffer PLC problem

[Steve Christo]

The sniffer quit cycling on Friday afternoon, 10/2/09. Installed OS 
updates today, rebooted PC, cycled power on PLCs, downloaded fresh PLC 
software. The LabView control program is hanging when it waits for a 
response to from the PLC when initializing. Am able to communicate with 
PLC through "Concept" program, i.e. upload, download programs, view 
status, etc.. The Alarm rack shows a persistent lit yellow "Trouble" 
light. Krister and I could not figure out what that means from the PLC 
software. Also, four of the PLC analog modules are showing a red "F" on 
the front panel next to the "Active" light. Two of the modules are 
showing a rapidly blinking "Modbus+" light. I don't know if any of these 
module conditions is normal. What can make the "Trouble" lamp to light? 
Will? John?
Steve