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Pausing a PID Loop

Created by: jwilcoxson at: 5/16/2014 2:30 PM (6 Replies)

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5/16/2014 2:30 PM	Rate (0)
jwilcoxson Posts: 102 Rating: (22)	I am relatively new to PID control in general, and I have an application where I am using PID_Compact with a S7-1214C. What would be the best way to Pause a PID Loop from processing? Is it as simple as using a contact in front of the PID_Compact FB call in the Cyclic Interuppt OB to stop it from processing?
jwilcoxson Posts: 102 Rating: (22)
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5/16/2014 2:47 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/26/2025 Posts: 6889 Rating: (1368)	jlw2387 I am relatively new to PID control in general, and I have an application where I am using PID_Compact with a S7-1214C. What would be the best way to Pause a PID Loop from processing? Is it as simple as using a contact in front of the PID_Compact FB call in the Cyclic Interuppt OB to stop it from processing? Hello, PID controller in manual mode can stop processing and output a constant value.There are some concerns regarding the bumpless switchover from auto-->manual and vice versa.You can program in such a way that moment of auto-->man is bumpless While man-->auto normally rectified internally.More help in online help in TIA portal. Best regards, Hamid Hosseini
	Last edited by: hdhosseini at: 5/16/2014 2:50 PM Demo Channel on Youtube
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This contribution was helpful to 4 thankful Users Marcjan Madhava PDGANGANI Thangabali

5/16/2014 6:37 PM	Rate (0)
Madhava Silver Member Joined: 11/26/2011 Last visit: 4/11/2025 Posts: 508 Rating: (23)	Don't disable the block . You can set manual value anytime to avoid auto control

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5/16/2014 7:54 PM	Rate (0)
jwilcoxson Posts: 102 Rating: (22)	Thank you, thats what I did and it worked out great.
jwilcoxson Posts: 102 Rating: (22)
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This contribution was helpful to 1 thankful Users Saggy

5/16/2014 8:58 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/26/2025 Posts: 6889 Rating: (1368)	jlw2387 Thank you, thats what I did and it worked out great. Thank you for your feedback! If you solved the issue of bumpless Auto<-->Manual transition, please share a snapshot of your program for future reference of users here. Thanks in advance Hamid Hosseini
	Demo Channel on Youtube
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This contribution was helpful to 1 thankful Users Mo.Sa

5/16/2014 10:30 PM	Rate (1)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, I would not call it bumpless and it works only in case of a slow proces. Record the last pid output(in%)at transition from auto to manual and use that value as manual setpoint can be a solution in some cases. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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This contribution was helpful to 2 thankful Users hdhosseini Madhava

5/17/2014 5:10 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/26/2025 Posts: 6889 Rating: (1368)	Marcjan I would not call it bumpless and it works only in case of a slow proces. Record the last pid output(in%)at transition from auto to manual and use that value as manual setpoint can be a solution in some cases. or generally step to ramp convertor do the same, select the rate based on requirement
	Demo Channel on Youtube
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