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Is it possible to make Dead Band in FB41 not symmetrical ?

Created by: Alex3110 at: 2/7/2016 9:31 PM (2 Replies)

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2/7/2016 9:31 PM	Rate (0)
Alex3110 Bronze Member Joined: 3/14/2010 Last visit: 3/19/2023 Posts: 313 Rating: (3)	I would like to make Dead Band in FB41 (Continious PID-control) not symmetrical and move the set point line closer to high limit. Is it possible to do ? And how ? In other words I need the low limit of the Dead Band to be farther from the setpoint but the high limit remains the same.
	Last edited by: Alex3110 at: 2/8/2016 5:01:27 AM Last edited by: Alex3110 at: 2/8/2016 5:01:50 AM Last edited by: Alex3110 at: 2/8/2016 5:02:03 AM Last edited by: Alex3110 at: 2/8/2016 5:03:31 AM Last edited by: Alex3110 at: 2/8/2016 5:11:23 AM Last edited by: Alex3110 at: 2/8/2016 5:12:24 AM
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2/8/2016 8:14 PM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 2/20/2023 Posts: 1347 Rating: (226)	Hi, The deadband is like a tolerance, you can specify the width. See the Standard PID Control manual under chapter "4.3.1 Filtering the Signal with DEADBAND Function". Anyways if you desperately want to have a solution see the above manual under chapter "4.1.4 FC Call in the Setpoint Branch (SPFC)". Just an idea: Create an FC what help you to offset the SP within the deadband. Why do you need this function?
	Last edited by: MicroMan at: 2/8/2016 10:51:13 PM Last edited by: MicroMan at: 2/9/2016 9:53:09 PM - What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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2/9/2016 9:40 PM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 3/15/2023 Posts: 1410 Rating: (146)	Dead band is to limit noise which has the mean value of zero. I don't think you can have two different limits, because it has no sense.

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This contribution was helpful to 2 thankful Users MicroMan Duris_I

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