I assume the reference to PLC4 regards new Beckhoff code installed yesterday  (see LHO log 49126 ). Because it was SQZ-related, I assume it was PLC4 on h1ecatc1.   Perhaps we need to use ECRs and Work Permits for these changes?   This will make it easier to track things and plan updates on the L1 production system.

We also likely should make it more automatic to restart these SDF processes following Beckhoff code changes (at both sites)