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Two OIU's crashed at our facility and no matter what parts I throw at them, they won't come back.

The Bailey system is net90. its really old i know. I believe the model OIU is "2". After they crashed, not at the same time, they were rebooted and powered up to a blank screen except for a character line at the top. This line says something about the graphics module. The system never tries to load from the hard drive or communicate with the loop. i have changed all the mfc's and iox's several times, as well as the hard drive and driver card. The LIM, BTM, and Loop Storage Module have also been changed.

Does anyone out there have any advice as to where to look next?

Oh memories, memories, the first Bailey OIU and the best HMI they ever made.. Diagnostics, chunky graphics, alarm management. It had it all. Not like these modern apologies for everything the OIU had.

Spent hours on my knees in front of it. If you have replaced everything your problem will be the back plane. If you have a spare MMU replace it. If not then check for continuity along the back tracks.
Great to hear that somebody is still using them. Wish Simplicity, Wonderware and all them had just a few of the OIU features. If you really get into trouble may be able to find a few in New Zealand.

Wow!! surprised that some old OIU's are still out there doing their jobs...

I agree, check the MMU.

b.r.

Romulo

Ok I changed out the back plane with one we had in spares. No Luck. Same result. The part I used could have been bad though. Could it be the back plane for the LIM BTM and Loop Storage? I'm going to try to locate another back plane and try it again.

Thanks for the help.