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  1. Not that long ago, Ethernet wasn’t common on PLCs and other industrial devices. Even 10 years ago you often had to buy a separate option card to add Ethernet to your PLC. But now it has become ubiquitous and with it has come a plethora of terminology and misunderstanding. I often hear customers ask, “does this PLC support Ethernet communications?” Unfortunately, the answer for most current PLCs is yes. Why is this an unfortunate answer? The problem is Ethernet is not a communications standard, and it is not even a hardware standard. So, what is Ethernet and what do I mean when I
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