12/5/2012 3:33 PM | |
Posts: 43 Rating:
|
FreakOnALeash, How can I perform PID cascade in s7 1200. I need to make 3 elemen PID control for boiler. As I check all input nodes, no available for cascading the PID. |
Last edited by: OnoMas at: 12/6/2012 11:45 PMLast edited by: O_Moderator at: 12/6/2012 11:41 AMnew subject after splitting from /tf/WW/en/Posts/80290#top |
|
12/6/2012 10:21 AM | |
Posts: 267 Rating:
|
Do you mean with "3 elemen PID control" the technology object "PID_3step"? http://support.automation.siemens.com/WW/view/en/62154322 The idea of a cascade is to use the PID output of the outer control loop as setpointfor the internal. So you need two PID technology objects and the internal must be called ina faster cycle interrupt. Sorry, but I don't understand the picture. What does the letters and numbers stand for? And what do you mean with "As O check..."? |
Follow us on