8/11/2022 11:17 PM | |
Joined: 9/27/2006 Last visit: 9/21/2024 Posts: 12282 Rating: (2684)
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Hello DKrills; If you want to master Step 7 v5.6, I suggest you download (and study) this Programming with Step 7 (v5.6) manual, which contains a great amount of very useful information. Chapter 20 describes the differences between Monitoring and Forcing a variable. Montiroring impies a VAT table, and the values you try to set are replaced immediately on the next scan (around 20 ms) by the value in the user program ir on the input connector. Forcing is done through a Force table, the yellow Force LED becomes active on the CPU to warn the programmer yhat his program us not actually in control and the value you set in the Force table is never replaced by the actual input value until you remove the forcing value (which can be dangerous in case this is a real process or machine). https://support.industry.siemens.com/cs/ca/en/view/109751825 The following discussion alsopresents views covering the same subject, by some of our most knowledgeable members: https://support.industry.siemens.com/forum/ca/en/posts/how-to-force-the-inputs-(di)-in-s7-300-cpu-/51203/?page=0&pageSize=10 Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 08/11/2022 23:21:50Last edited by: dchartier at: 08/12/2022 18:11:09 |
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