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PID Control, Any idear how to make a three point stepping controller?

  • Thread starter Thomas Christiansen
  • Start date
T

Thread Starter

Thomas Christiansen

I have made a small PID controller on a Siemens S7-200. Making the Analog part was no problem. But I have to Control a valve. With step up, neutral, or step down signals. I made a test where i used the controllers output to control a timer and a fixed "step" lenght, but the "hardware" I have seen, used a varible step lenght and i varible pause. Is there somebody who can tell me how to convert Analog output signals to stepping signal the "right" way.
 
S

Stefan

The easiest way to do an (digital) control of ex. Heating / cooling. is to do your own controller. read the set temp ( ex 90 ) and a window setpoint. This prog. execute with an timer interrupt. Ex. +1 degree ( 91 ) = cooling output - 1 ( 89 ) = heating out put no cooling + no heating = neutral I tryed this several times and it works ok. ( easy to use but not "perfekt" or by the book )
 
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