12/15/2009 10:26 AM | |
Posts: 6 Rating: (0) |
Is there really no one that can use this? |
12/15/2009 11:05 AM | |
Joined: 10/7/2005 Last visit: 9/22/2024 Posts: 3021 Rating: (1054)
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Hello Lasse13 perhaps the following links will help: 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? What should you watch out for when calling and assigning parameters to the controller functions in function blocks (S)FB41, (S)FB42 and (S)FB43? You've also mentioned that you intend to use FB41 together with SFB43 which woudl eb a weird combination. The SFB4x's PID related blocks are only availble inS7 300 C type CPU's and C7's and shoudl you use these than you might as well use SFB41 instead of FB41 (you must use FB4x in all other S7 CPU's). I hope this helps |
Cheers |
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12/15/2009 11:52 AM | ||
Posts: 6 Rating: (0) |
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12/15/2009 1:27 PM | |
Joined: 10/7/2005 Last visit: 9/22/2024 Posts: 3021 Rating: (1054)
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Hello again Lasse13 while I thus far nothave had the need to use (S)FB43 I have a "feeling" thatyour problem is related tomaking the "minimum pulse/minimum break time P_B_TM" as long as the overall PER_TM cycle. I suggest you try a smaller time value for P_B_TM (or a longer one for PER_TM). I hope it helps and in case it doesn't please post your S7 project for evaluation. |
Cheers |
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