For the PID variable time interval

Hello world

I measure the ph and control the flow of co2, so I decided to use the useful PID screw like I do for my temperature control.

the difference and so my question is, I have not want (/ power) to run the PID in a timed loop, in fact my intervals of measurement (eg. every 30 seconds ~ or ~ 60) may vary in the second range, because of the way I acquire data and how I put the valve in co2.

so my question is: is this a without problem?

I'm not sure weather the internal timer or providing the dt will explicitly be responsible for this?

(and I can't test it on atm equipment)

thx for your time

Shouldn't be a problem. Don't wire dt, let the PID to use its internal clock. Could make it more difficult to tune the PID, since you will have to account for the worst cases (longer delays between updates).

Tags: NI Software

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