I'm searching an arduino uno shield that will allow to communicate with industrial grade PLC and sensors (24v).

Something like https://github.com/TheDIYGuy999/Mega_PLC/tree/master/Digital_Input_Board but that can plug on top of an arduino uno.

Is there anything already made, on the shelve, like an arduino relay shield but for input and opto-isolated in 24v and if possible powered by the arduino 5v power.

The best will be to have both on the same card (relay for output and opto-isolation/transistor for input) ...

  • Did you google "PLC arduino"? There appear to be are several commercial products you can use, as well as guides to build your own. I think you will find the answer there. – MichaelT Jun 8 '18 at 10:17

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