This morning, during the usual OMC check in single bounce, the attempt of locking the OMC failed. As shown on Fig.1 the resonance of the TEM00 was crossed around 7h53m55 utc (and the OMC1_PD_DC_check goes to 1 as expected at this time), but the lock was not triggered. This is due to the fact that LSC_ENABLE was equal to 0 at that time. We can see that LSC_ENABLE was set to 1 around 7h44h54 utc but it stayed ON only for half a second. The reason why LSC_ENABLE did not stay to 1 is because the DET_MAIN node was in DOWN at the time the LSC_ENABLE was set to 1.

Next time I recommand the following order in the procedure :

* After setting the NI single bounce mode,  put the metraton note ITF_LOCK in PAUSE

*  From the metratron node DET_MAIN, request the state SHUTTER_OPEN.

* Only after the OMC shutter is open, set the LSC.ENABLE = 1 from the python interface.