Toggle PID setpoint

[DavidT]

Hi All,

Im having a bit of a problem coming up with a solution for my PID loop.
What I would like to do is to toggle the SP between two set values (0 and 5 MPa). I know you can do somthing like this with SP Profile, but this does not suit my requirements as I would like to ensure that the Process Variable reaches the SP and soaks for a set time (this is not guaranteed with SP Profile). Once this soak time is achieved, I would like to toggle setpoint (with a boolean or such). The problem i am having is getting a suitable signal that determines that the soak time has been achieved and use this signal to change the SP.

Any ideas on how this can be implemented? Anything would be of great help.

thanks in advance

David

[BeckyB]

Hello DavidT -

Have you viewed this [broken link removed; article no longer available] Knowledgebase? It tells how to generate Setpoint Profile in LabVIEW for a control application and even has an example program.

As for implementing a suitable signal, perhaps another customer has had this same issue and can reply with their solution. In the meantime, I will look further into the matter. Have a great day!

Becky B.
Applications Engineer
National Instruments