foobar Posted April 9, 2018 Report Share Posted April 9, 2018 What is the best way to uniquely identify a UniStream® 15.6" PLC with software? Several PLCs are connected to a network with Ethernet cables and they are monitored/controlled by another equipment. I would need to be able to uniquely identify every connected PLCs to make sure, for example, that a PLC connected to given IP address is the expected one. I have read on ASCII String to MI? that the best way to do that was to retrieve the CPU MAC address. Is it still the best way today? Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted April 9, 2018 MVP 2023 Report Share Posted April 9, 2018 Look at the System tags, specifically this UTF-32 string: System.CPU HW Version.Serial Number. Joe T. Link to comment Share on other sites More sharing options...
foobar Posted April 10, 2018 Author Report Share Posted April 10, 2018 That makes sense but, unfortunately, the `System.CPU HW Version.Serial Number` tag just display "Serial Number". So it does not uniquely identify a PLC. I would have expected the same number as the one printed on the sticker at the back of the panel or the CPU module. This is a screen shot taken with VNC Viewer (other ID tags have been blurred): Link to comment Share on other sites More sharing options...
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