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ALARMS: set alarm levels based on offset or percentage #4480

Open FreddieAkeroyd opened 5 years ago

FreddieAkeroyd commented 5 years ago

On RIKENFE (and perhaps elsewhere) it would be useful if the alarm levels for PVs could be defined as a percentage of the setpoint, or as the setpoint +- some absolute difference.

At present, the beamline tuning script sets the alarms to match. But with cset() or set_pv() or using the OPI GUI, the alarm level are unchanged and there may be an alarm if the user intentionally tunes something.

Notes:

The underlying EPICS behaviour only supports absolute values for HIGH, LOW etc. so we would need to add a mechanism ourselves, possibly something like run control (so you enable “automatic alarm adjustment” and a threshold value and then some underlying logic would monitor changes in SP and adjust alarm levels accordingly).

kjwoodsISIS commented 5 years ago

Suggest creating a service that can run an arbitrary genie_python script in the background. Scientists can then run their own script to implement the desired behaviour. Needs discussion first - it is potentially a large piece of work.