Beckhoff communication loss SA1-EPS

12h19: BKR informs PRC about a limitation to 30 bunches in total for the north branch.
The property "safety_CRL_SA1" is lmiting in MPS.
DOC and EEE-OCD and PRC work on the issue.

Just before this, DOC had been called and informed EEE-OCD about a problem with the SA1-EPS loop (many devices red), which was very quickly resolved.
However, "safety_CRL_SA1" had remained limiting, and SA3 could only do 29 bunches but needed 384 bunches.

EEE-OCD together with PRC followed the procedure outlined in the radiation protection document 
Procedures: Troubleshooting SEPS interlocks
https://docs.xfel.eu/share/page/site/radiation-protection/document-details?nodeRef=workspace://SpacesStore/6d7374eb-f0e6-426d-a804-1cbc8a2cfddb

The device SA1_XTD2_CRL/DCTRL/ALL_LENSES_OUT was in OFF state although PRC and EEE confirmed that it should be ON, an aftermath of the EPS-loop communication loss.
EEE-OCD had to restart / reboot this device on the Beckhoff PLC level (no configuration changes) and then it loaded correctly the configuration values and came back as ON state.
This resolved the limitation in "safety_CRL_SA1".

All beamlines operating normal. Intervention ended around 13h30.