Do X20 CPUs support Link Layer Discovery Protocol? If yes, how does it work?
No, I don’t think so, at least not in any official released software.
There’s no setting in Automation Studio that points into that direction, and I’ve never seen any LLDP packets or so in wireshark when tracing PLC communication until now.
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as @alexander.hefner already mentioned, there is currently no LLDP support.
Nevertheless, it is perhaps worth mentioning that various functionalities are being worked on in the area of OPC UA FX, respectively the OPC UA FX technology package. This will also include LLDP in the future. However, we are still at an early stage here, in which initial concepts are being developed.
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Thank you both for your input. Much appreciated.