ML1100 lost IP address, but not the program

Has anyone come across an ML1100 loosing its IP address? The program is still loaded and runs ok. Lost comms with the Telemec screen, checked LCD screen on the ML1100 and the IP address is blank.

The PLC is currently a "development unit" on my desk, its been off for a week, but surely if lost IP address it would loose the program.

Searched the forum for info, but found nothing like this.

I know with the SLC, if you have BOOTP checked, it will lose the address. Not sure if this is the case here but it may be worth a shot.

It can be found in the channel configuration within your program.