Experimental Physics and
Industrial Control System

"Kasemir, Kay" <[email protected]> · Fri, 15 Sep 2017 12:58:08 +0000

Hi:

>Any idea what's the equivalent for 'triggerPV' in our Display-Builder ...
>In OPI I used it as : if triggerPV==pvs[1]:

There is no equivalent.
If any of the PVs that are configured to trigger the script changes,
the script is scheduled for execution.
Just before it's actually executed, another of the PVs could re-trigger execution of the same script, whereupon we just notice that this script is already queued for execution.
Finally, the script is executed, but you can't tell which of the trigger PVs caused that in case your script has more than one PVs configured as a trigger.

If your script needs to perform different functionalities  depending on which of the PVs triggered, maybe you better use one script per functionality?
Or is your script really that complicated because it's more than just some display-related gimmick? If it's actually performing a control function, it really "does" something to the machine, that functionality should be placed in the control system (IOC, database logic, SNL, ..) and not the GUI.

-Kay

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System