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this post was submitted on 29 Jan 2026
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What? The IO is digital inputs and outputs, analog inputs and outputs.
Then there's power distribution and 24v DC device power (or 120v depending on application and often age), relays, contactors, timers, VFDs, etc. This is what the world runs on. Networking cables like that Ethernet are still part of it but a pretty small part. They just get plugged into all the PLC racks and any other device that needs it. Some of what I described can be replaced with automation and code, but only the very old legacy devices a lot of these old plants and mills still have around because they're still functional..
My point (if you can call it that) is that you can have remote racks and cut the total footage of wire by 75%