rslogix 5000 Ethernet connection Fault

rslogic 5000:
I need to setup a alarm to detect if Ethernet has lost connection I have searched everywhere on the net and can not find out how to accomplish this I'm asumming that I have to use GSV but I cant find out what class or bit I use to detect if the Ethernet is active or not

Did you "search" this?
Monitor the Health of a Module- Page 14 of http://literature.rockwellautomation.com/idc/groups/literature/documents/pm/1756-pm015_-en-p.pdf

I'd suggest doing it the brute force way if this is critical comms to another process. Set up heartbeat detection to check.