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I am an experienced engineer with Programmable Logic Controller and the list here described Programmable Logic Controller. They are NOT Power line communication. Zawthet ( talk) 16:08, 18 July 2015 (UTC) reply

@ Zawthet: So why not add companies that you think are in the Power line communication space? Ottawahitech ( talk) 22:19, 4 September 2015 (UTC) reply

The title says " PLC", which is ambiguous. Shortly after it was created, "PLC" was disambiguated to stand for " power line communication", but then in February 2017 that was abruptly changed to " programmable logic controller", so as a result this list is a mix of manufacturers of both kinds of equipment. Arteitle ( talk) 16:32, 3 July 2018 (UTC) reply