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| 9/21/2011 7:45 PM | |
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Posts: 33 Rating:
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Hi I use a analog input card on ET200s. But how can i filter my analog input? Someone have good advice, or is there a Fb that i can use? Thanks Regards. |
| 9/21/2011 9:13 PM | |
Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating:
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Dear JCTN Check chapter 2-1-9 of the following manual , the first order filter as a function in modular PID control.The transfer function in laplace domain is like: Y/R=1/(1+Ts) http://support.automation.siemens.com/WW/view/en/1137082 in which T is the time constant.The filter smoothes the jumps in the process values.It is recommended to be used as signal preprocessing in a PID loop. If you are familiar with numerical solution of ordinary differential equations ,you can write your own codes to have same result. http://www.swarthmore.edu/NatSci/echeeve1/Ref/NumericInt/Euler1.html Best regards |
Last edited by: hdhosseini at: 9/21/2011 9:42 PM |
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| 9/22/2011 8:00 PM | |
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Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating:
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I have used the "LAG1ST" function of Modular PID control package and the result was satisfactory.It is not difficult to use but you need the mentioned package.Also there are some other proposed functions which can be found in the following threads,but they should be tested for proper response: Smoothing analog signalAnalog Input filteringBest regards |
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