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Modbus RTU FC05

Forum: Engineering 🇬🇧

Creator: johndoe67

Created: 2022-07-18

Updated: 2022-07-20

johndoe67 - 2022-07-18

Hello,
I'm looking for an example how to implement a Modbus RTU request FC05 Write Single Coil.
Maybe someone has such an example? Maybe with other writing requests?
Thanks in advance and best regards.
John

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i-campbell - 2022-07-18

https://forge.codesys.com/prj/codesys-example/modbus/home/Home/

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johndoe67 - 2022-07-19

Hello i-campbell,
Thanks a lot for the link to the examples.
But my problem is in the detail when using the FC05 Write Single Coil.
Probably I haven't described it sufficiently. I have now attached some screenshots and a, I hope sufficient explanation.

Modbus FC05.pdf

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i-campbell - 2022-07-19

here are two examples of ways you can access the coil. The 0xFF00 detail has been abstracted by the library.

modbus FC05.png

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johndoe67 - 2022-07-20

Thanks again. I think I'm already that far.
But it seems that not only the library abstracted the detail 16#FF00?
I still don't know how to send with FC05 in one Byte...

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