Experimental Physics and
Industrial Control System

Hello Gerrit,

here is another solution for your dutycycle which uses one calcout record (DUTYCYCLE) and one analog input record (CYCLERESET).

I added the TRIGGERED for demonstration purpose only. It gets processed every time the TEST:DUTYCYCLE transitions to 0.

DUTYCYCLE reads the value of CYCLERESET every second via its INPA link.
The CALC _expression_ compares its A value to the value of A from the previous scan, which is acquired via tha INPB link.
If A changes, it is used as a new VAL for DUTYCYLE, otherwise VAL is counted down. 

Because DUTYCYLE.DOPT is set to "Use OCAL", the DUTYCYLE.OUT link sends the value calculated by the DUTYCYLE.OCAL _expression_ (here a constant 1)  every time when VAL transitions to 0.

Note that DUTYCYLE.VAL can be changed by a Channel Access put at any time. If you want to prevent this, set DUTYCYCLE.DISP to 1.

#= database generated by tdct V3.1.8 #= on 2023-11-23 08:31

record(calcout,"DUTYCYCLE") { field(OOPT,"Transition To Zero") field(SCAN,"1 second") field(DESC,"duty cycled output") field(CALC,"A#B?A:(VAL>0?VAL-1:A)") field(DOPT,"Use OCAL") field(OCAL,"1") field(OUT,"TEST:TRIGGERED.PROC") field(INPB,"TEST:DUTYCYCLE.LA") field(INPA,"TEST:CYCLERESET.VAL") } record(ai,"CYCLERESET") { field(LINR,"LINEAR") field(EGU,"volts") field(ASLO,"0.0000000e+00") field(DESC,"analog input record") } record(calc,"TRIGGERED") { field(CALC,"A+1") field(DESC,"calculation record") field(EGU,"units") field(INPA,"TEST:TRIGGERED.VAL") }

Replies:

Re: "duty cycle" records Ralph Lange via Tech-talk

Re: "duty cycle" records Gerrit Kühn via Tech-talk

References:

"duty cycle" records Gerrit Kühn via Tech-talk

Re: "duty cycle" records Ralph Lange via Tech-talk

Re: "duty cycle" records Gerrit Kühn via Tech-talk

Re: "duty cycle" records Ralph Lange via Tech-talk

Re: "duty cycle" records Gerrit Kühn via Tech-talk

Re: "duty cycle" records Mark Rivers via Tech-talk

Re: "duty cycle" records Gerrit Kühn via Tech-talk

Re: "duty cycle" records Gerrit Kühn via Tech-talk

Re: "duty cycle" records Rolf Keitel via Tech-talk

Re: "duty cycle" records Gerrit Kühn via Tech-talk

RE: "duty cycle" records Žiga Oven via Tech-talk

Re: "duty cycle" records Gerrit Kühn via Tech-talk

RE: "duty cycle" records Žiga Oven via Tech-talk

Re: "duty cycle" records Gerrit Kühn via Tech-talk

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