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FB41 - CONT_C PID Loop

Created by: MRW at: 7/6/2010 4:38 PM (3 Replies)

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7/6/2010 4:38 PM	Rate (0)
MRW Posts: 2 Rating: (0)	Any help would be appreciated; The help file for FB41 states, "The calculation of the values in the control blocks is only correct if the block is called at regular intervals. For this reason you should call the control blocks in a cyclic interrup OB (OB30-OB38). Enter the sampling time in the CYCLE parameter." Does this mean that if I include my PID loops in say OB32, which will interrupt the main program ever 1s, that I should also enter 1s as the sampling time for the FB41 input parameter CYCLE? Or will any cycle value less than 1s be sufficient as OB 32 will execute the PID loop every second anyways... Regards, MRW
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7/6/2010 9:31 PM	Rate (1)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 9/3/2025 Posts: 12397 Rating: (2717)	Hello MRW; You are correct. CYCLE time must be the same as the cycle of the calling OB3x. Usually we use OB35 wih 500ms, but any available cyclic OB3x can be used as long as the FB41 sampling time corresponds. Hope this helps, Daniel Chartier

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This contribution was helpful to 2 thankful Users H-H MRW

7/6/2010 10:12 PM	Rate (0)
MRW Posts: 2 Rating: (0)	Excellent; very much appreciated. -mrw
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7/8/2010 9:22 AM	Rate (0)
SINAMICS_TO Bronze Member Joined: 4/24/2008 Last visit: 1/15/2025 Posts: 213 Rating: (16)	Yes you are right. You can also change the Sample time of the OB3x in Hardwareconfiguration. Also have a look at this FAQs http://support.automation.siemens.com/WW/view/en/17624666 http://support.automation.siemens.com/WW/view/en/27192459

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This contribution was helpful to 1 thankful Users MRW

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