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  1. petermannon
  2. PLCnext Store
  3. Friday, 12 June 2020

Hello !


I was wondering if there are plans to create Function Blocks for direct PLCnext to PLCnext communications ?

I have used ProfiNet (Controller/Device) to communicate, but this communication is not smooth - as all Data Must be converted (then uncoverted) to BYTES.

I am hoping to directly communicate REALs, WORDS, DINTs, BYTEs, BOOLs and ARRAYs (if Possible) directly PLCnext to PLCnext.


There is a Function Block on the PLCnext Store called ComSiemens, which is comparible - from PLCnext to Siemens S7.

Wouldl like that same Functionality PLCnext to PLCnext.


Thank you and have a great day !!


Peter !

Accepted Answer
Martin PLCnext Team Accepted Answer Pending Moderation

Hi Peter,

That is an excellent idea.

My first thought is that this could be achieved (in the future) using something like the existing "Data Access" service. This service is currently only callable from C++ (or languages that can call C++ functions), but it might be possible to extend this service in the following ways:

  1. Allow the Data Access service on a PLC to be called from a remote machine, in any language.
  2. Allow the Data Access service to be called from IEC 61131 code.

Then, it would be possible to read and write GDS variables on a PLC, from IEC code running on any other PLC.

There is at least one R&D project that is heading in this direction, but even if this produces successful results I expect it will be some time before we see what you describe.

There are probably other solutions, e.g. using OPC UA or the REST interface to map data between GDS variables on different PLCs. This could be done today, with a bit of effort, so perhaps someone in the Community is working on something like this already.


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