1/18/2011 4:52 AM | |
Joined: 1/28/2009 Last visit: 8/5/2024 Posts: 6844 Rating: (1365) |
Dear member please check the following link for more information: The classical three-term PID controller BR |
1/18/2011 6:08 AM | |
Joined: 1/28/2009 Last visit: 8/5/2024 Posts: 6844 Rating: (1365) |
Check pages 12 to 17 for more information about the CONT_C functions. (and their parameters) BR AttachmentS7pidcob.pdf (2130 Downloads) |
1/18/2011 2:47 PM | |
Joined: 1/28/2009 Last visit: 8/5/2024 Posts: 6844 Rating: (1365) |
Dear Dunk Please check the attachment for step response of a PI controller which is exactly used by SIEMENS in FB41. This is extracted from here and manual introduced in last post. FB41 needs gain(KC in curve) and reset timeTi (T1 in curve). Please note that term 'repeats/minutes' which is widely used in DCS systems stands for result of (gain/Ti) or (KC/T1).With this factor (as shown in attachment), the integral mode tries to repeat proportional correction (h(t)) by the end of first integral time.The h(t) is added by gain if error is consatnt and each integration time passes. Note, the shorter the integration time more propertional correction is repeated (more repeats / minutes). I hope this helps hdhosseini AttachmentPI_REG.zip (1197 Downloads) |
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1/18/2011 10:38 PM | |
Posts: 3 Rating: (0) |
Thanks for your help. |
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