betsy.weaver@LIGO.ORG - posted 10:57, Tuesday 01 July 2014 - last comment - 11:21, Tuesday 01 July 2014(12563)
Guardian Question
After this mornings boots (just happened, see more from Dave I suspect shortly), I see that the guardians for all of the SUSes come back in EXEC mode. THey were previously set to PAUSE or other state. Why does it reset to EXEC after boots?
Guardian nodes come up in EXEC after restart. Their state is not preserved across restarts. I understand why this would be an issue, though, so maybe I should work on a way to preserve state across restarts.
Why did the nodes restart, though? Did the guardian machine get rebooted?
Presumably the problem here was that the nodes came up in EXEC, and then went to their default ALIGNED state, which disturbed the optic alignment happening in chamber. One way around this would have been temporarily modify the SUS nodes to come up with the initial request as SAFE. This would have prevented the damping loops from being engaged and the alignment offsets from being enabled.