12/7/2019 2:11 PM | |
Joined: 11/20/2011 Last visit: 3/29/2023 Posts: 80 Rating: (0) |
Hello, I am using Step7 with Siemens Drive. I have abad issue with programming, because of the Step7 Big Endian Architecture. According to: https://support.industry.siemens.com/cs/ww/en/view/8894363 When the control word goes from 047E to 047F, the drive starts running forward. When I make 047F in binary form, it is 0000-0100-0111-1111, that is the least bit of the control word is ZERO ( bold and underlined zero in eighth position). Then how the drive runs? Please pay attention that the least bit that is italic here is for example m1.0 not m0.0. |
Last edited by: 8501734 at: 12/07/2019 14:12:23Last edited by: The Helping Hand at: 12/09/2019 15:11:20Optimized Link |
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12/7/2019 4:34 PM | |
Joined: 9/27/2006 Last visit: 9/25/2024 Posts: 12283 Rating: (2685)
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Hello 8501734; It seems you are not reading the Control word of the drive correctly. If it was an Endian problem, the bytes wold be inverted, so that 16#047F would be read 16#7F04, for example. But this is not the case, at least if the master is a Siemens CPU. So, if the Control word binary value is 0000-0100-0111-1111, thgen le rightest 1 in the Least significant byte must show a rising edge, 0000-0100-0111-1111, to start the drive. Have a look at the Control Word bit definition, from this manual: Operating Instructions: MICROMASTER PROFIBUS Optional Board https://support.industry.siemens.com/cs/us/en/view/6586565 Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 12/07/2019 17:01:02 |
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12/7/2019 9:19 PM | |
Joined: 11/20/2011 Last visit: 3/29/2023 Posts: 80 Rating: (0) |
Hi, Your image is exactly true. I am making the drive control word, not reading it. I say if for example we send mw0 as the control word, m0.0. is the jog forward, and m 1.0 is run/off1. You have shown in the image, but the bytes must be swapped. Please have a look at the attached image. If we put run/off1 on m0.0, it is wrong, and it is assigned to jog bit, if we send mw0 to the drive. |
12/8/2019 12:44 PM | |
Joined: 9/27/2006 Last visit: 9/25/2024 Posts: 12283 Rating: (2685)
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Hello Piscean; When thelink above opens (in HTML) there is a Download button available (It might appear on the second page, depending on yous screen settings). Once i ask for the download, the webpage asks me to register, I used my LinkedIn credentials to connect. This is the file I downloaded to my computer. Hope this helps, Daniel Chartier Attachmentdmcsiemenssummit2011-toptenprogrammingmistakesslideshare-110713160157-phpapp01.pdf (126 Downloads) |
Last edited by: dchartier at: 12/08/2019 12:45:55 |
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