CAN communication with Siemens PLC

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Hi Daan,

I expect you to be Dutch or Flemish, with a nickname like that...
So this: might help a lot :)


--- Quote from: pinias on May 17, 2023, 05:34:21 PM ---ok, I just saw it

as per Siemens CAN module tech specs it says it supports CAN 2.0A and CAN 2.0B.

if that is true I would rather work with CAN2.0A instead of CANopen, in such case, both are masters the controller and the Siemes PLC


--- End quote ---

There is a lot to learn about CAN and I have only scratched the surface but, be careful not to confuse CAN 2.0A or 2.0B which are CAN specifications with CAN Open (or J1939, etc.) which are higher level protocols.

Here is another site with some guides and info: -

thank you all very much!

I'm going to dig a little deeper into everything you've given me. If I have any more questions I'll ask them here but for now I can move on.

Thanks!  ;D

Good afternoon everyone

After going through everything again, I already understand a bit more about CAN communication, for which I thank you.
But do any of you know the best way to set up the CAN communication?
By this I mean where I have to set something (for example the IDs) to read the data and identify/name it correctly so that both master and slave know what they are communicating about.
This is not really talked about in the Danfoss documents and videos as far as I have found.

I also have a question for you Pinias.
What exactly do you mean by CAN COB ID mapping and how do I do this?
I also wonder why you don't use a block like this one in the attachment.
Does this have a specific reason or is it more of a personal choice?

Thank you in advance!


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