What is the oldest PLC system you have running?

Steve Bailey · Oct 13, 2021

Sounds like an urban legend to me. Was there such a thing as GM's IT in the late 1960s? And if it existed, would it have the clout it enjoys today?

Ken Moore · Oct 13, 2021

Back in the late 1960's, GM's IT would have been known as the MIS department. Management Information Systems. Using IBM mainframes or similar.

L33er · Oct 13, 2021

later was EDS became part of GM. AND others ... like Hughes Electronic, Raytheon Defense system.

When GM open plants in China, all other high tech defense was conveniently transferred and stolen by the Chinese.

thingstodo · Oct 22, 2021

parky said:
I think Modicon was one of the first controllers it was designed by Dick Morley it was made up of "MOdular DIgitial CONtroller." I believe these were in use in the very late 60's I replaced one that was fitted in 1972 (I think), it was replaced in 1997 with a Mitsubishi A series.

It must have been quite an exclusive club, at the time. The first Modicon system that I replaced was installed .. maybe 1978? 984S maybe?

Saskatchewan, Canada is not exactly a progressive and high-tech mecca. But it's still a bit depressing that Modicon was around for 10 years before an industrial installation came up here.

Engineerj22 · Oct 22, 2021

https://imgur.com/14Kmkvw
An original AB PLC in northwestern Indiana in a grain silo. It actually isn't running anymore, replaced by PLC5s and controllogix. They still have cards for it around too. I like the online editing module myself.

L33er · Oct 23, 2021

Engineerj22 said:
https://imgur.com/14Kmkvw
An original AB PLC in northwestern Indiana in a grain silo. It actually isn't running anymore, replaced by PLC5s and controllogix. They still have cards for it around too. I like the online editing module myself.

interesting. PLC1a?

What is the oldest PLC system you have running?

Steve Bailey

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L33er

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Engineerj22

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L33er

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