11/18/2019 4:25 PM | |
Joined: 9/27/2006 Last visit: 10/15/2024 Posts: 12289 Rating: (2686) |
Hello ashadako; As you can see from the screenshot below, it is the Disturbance signal that must nbe modified by the FeedForward function before it is added to the Manipulated Variable. This image was extracted from the following manual: PCS 7 Advanced Process Library V8.0 - Industry Support ... https://cache.industry.siemens.com/dl/files/842/57265842/att_48310/v1/s7jal80b_en-US.pdf The FeedForward control variable is expressed in terms of Laplace Transforms, as described in the attached picture. Since it is stated that MV= MVPID + FF, all these signals must go though the same scaling function. Hope this helps, Daniel Chartier |
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2/20/2020 12:57 PM | |
Joined: 2/11/2020 Last visit: 2/22/2024 Posts: 1 Rating: (0) |
Hello. I'm pretty new with feedforward PID control. Can you provide a screenshot of how you implemented it? Thank you. |
2/21/2020 7:55 AM | |
Joined: 5/3/2017 Last visit: 5/21/2024 Posts: 673 Rating: (217) |
Hi Ouribes, you can find an example CFC for a PID with FFwd in the APL (Advanced Process Library).
If you search an example how to configure the FFwd you can use the application example Equipment Modules for SIMATIC PCS 7 using the example of the Chemical Industry. The Equipment Module "Buffer Control" use the FFwd. With regards |
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