Experimental Physics and
Industrial Control System

<[email protected]> · Wed, 21 May 2014 09:09:32 +0000

From: LEI Ge [mailto:[email protected]]
> This week we met a problem, a PV's value should be 1 (to enable our e-
> gun trigger), but sometimes it becomes 0 unexpectedly. I checked the
> software logic I can remember to this pv, and have not found the
> reason. Maybe there is some logic I forget or I don't know, to write to
> this pv. So is there a way to check in our control system, which PVs
> write to this pv? Or, this PV is written from which IP?

EPICS provides a hook, asTrapWriteRegisterListener, which is called on every CA put.  I've attached a small support module that I've written to use this to write a log message every time a CA put occurs.

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System