Something was wrong with communication between the cornner beckhoff plc2 and epics.  When I tried to change something in an medm screen, it would not change,  When I stoped PLC2, it would change the value on the medm screen.  Also, on the LSC refl common mode board medm screen, things were just continuously flipping, altough on the twincat side nothing seemed to be changing.  I tried commenting out all the changes I had made to the PLC, which didn't change the situation, tried rebuild all, clean all.  I tried shutting everything on the etchercat machine down and running the installation scripts again,  the epics did not come back.  Dave restarted the epics gateway, and things seemed to come back (at least from the other PLCs).  I was able to change values on medm screens, but the change didn't make it to the twincat side.  Then patrick suggested rebooting h1ecatc1, so I did and that seems to have fixed the problem. Adding back in my changes one at a time did not reproduce the problem. 

ALso, the timing system erros are back, Xend, Y end and Corner.  I'm not sure why.