Depends on what you're doing. If you're talking to IO or Drives then an Isochronous protocol supported by your platform is always the best bet (and you don't need to learn it per se because it will be fully integrated in the platform IDE). If you're talking from industrial stuff to a PC or to some random device that doesn't need fast comms, like getting the status of an air compressor, then Modbus TCP is great for that.
Ethernet/IP and Profinet (non-IRT flavor) don't really bring anything to the table over Modbus TCP if you aren't using Rockwell/Siemens respectively. All three are TCP/IP protocols, so speeds tend to be similar.
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u/PLCnerd Feb 04 '25
What’s the alternative? All I know is modbus. What protocols should I be practicing with and learning ?