Industrial Network Basics: Simplifying I/O Terminology

There are many terms used for I/O technology in industrial automation: Remote I/O, Distributed I/O,  Modular I/O, Expandable I/O, Block I/O, Conventional I/O and the list can go on.  What do they all mean?  Can they be used interchangeably?  What is the difference?

Lets be honest… this is a muddled topic and many people use different things interchangeably.  I’ve done a bit of research and reading of automation magazines, forums and websites and have tried to piece it together.

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