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Advice - Getting Time Proportioning Control to work

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  • Advice - Getting Time Proportioning Control to work

    Hello, I am attempting to create a functioning time proportioning PID for a heating system. I have a rough set of code for the program sorted out below, but can't seem to get it to actually work. I'm hoping someone on here can point me in the right direction. This code is for a Productivity3000 series machine. Click image for larger version  Name:	Capture222.PNG Views:	2 Size:	46.7 KB ID:	118398
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    Last edited by Cheeraxe1999; 10-08-2018, 10:43 AM. Reason: PID, PID Loops, Temperature Control, Time Proportioning


  • #2
    Did not type in all your code....but comparing to the example in P167 rung 11 TMR1DN needs to be TMR2DN. In addition, it does not look like you have a tag assigned to the current value for the timer on rung 11 which is referenced on rung 12?
    Last edited by P3K_ADC_Eng; 10-08-2018, 12:35 PM.
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    • #3
      Also on rung 8.1 "PID1AUTO" is showing a zero, which means it's in Manual Mode.

      Here is a note from the help "OFF is Manual Mode. ON is Auto Mode. In Manual Mode, PID calculations are made, but the Process Output is not updated. "

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      • #4
        Thanks! I got it to work just fine.

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        • #5
          Do tell. What did you change? Edit?

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          • #6
            It was actually just more of a scaling issue. My inputs were temperatures in Fahrenheit, so I had to scale my RTD value and my setpoint on a 0-65535 scale before sending them to the PID. Thusly - Click image for larger version

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