7/22/2011 5:20 PM | |
Joined: 1/28/2009 Last visit: 6/26/2024 Posts: 6841 Rating: (1360) |
Hi You can use FB41 in STEP7 via Libraries-->standard library-->PID control Blocks -->FB41. If you want more flexible options refer to the functions provided in Modular PID control package. 1- FB19-PID control 2-FB18-PARA-CTL
3-FB21- RAMP SOAK
Best regards |
Last edited by: hdhosseini at: 7/22/2011 6:41 PM |
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7/23/2011 12:58 AM | |
Joined: 10/7/2005 Last visit: 6/24/2024 Posts: 3008 Rating: (1052)
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Hello automation_1 I agree in general with hdhosseinithat CONT_C should be a suitable choice inyour "standard"PID application. As you have a 313C though, I suggest you useSFB41 instead of FB41and more info and example links about this can be found in the FAQ below: Where can you find descriptions and examples of PID control with FB 41, FB 42 and FB 43, and SFB 41, SFB 42 and SFB 43? I hope this helps |
Cheers |
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7/23/2011 1:51 AM | |
Joined: 9/27/2006 Last visit: 6/27/2024 Posts: 12264 Rating: (2672)
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Hello automation_1; One point could be made here, that ph control loops are heavily non-linear, and that a single setopoint generated by (S)FC 41 could lead to an uncontrolled loop as soon as you exit the linear range of your process. I am not sure of the level of experience you have in this type of control, but you could start with these suggestions from Expertune, a company that has a very good world-wide reputation on control loops and tuning software: http://www.expertune.com/articles/neutralizeph/neutralizeph.html hdhosseini's earlier post pointed you towards Siemens' Modular PID package, where you will find a function named NONLIN, which can be used to linearize a curve, and would provide a different controller output depending on the segment of the curve your PV is at. I strongly suggest you follow the manual link provided earlier and study it, before you start your project. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 7/23/2011 1:52 AMLast edited by: dchartier at: 7/23/2011 1:52 AM |
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