What is a PLC?

Automated systems all need something to come back to. There needs to be some sort of brain that runs the infrastructure, does all the math, and calls the shots within the building. This needs to be a programmable device, that works on numerous inputs and outputs, to control what’s going on. It needs to be rugged, reliable, and easy to use. We call it a PLC, Programmable Logic Controller.   The Basic Problem When we fully automate a building, chemical plant, or manufacturing center, we instantly open ourselves up to hundreds of thousands of little things that need to all be overseen, adjusted, and managed in a rational way. We don’t want a person to be opening or closing a vent by hand, or to have workers walking out to manage mixing valves, or anything else by hand. Everywhere a person might do something, we need a computer, sensors, and actual controls to drive. We could use a standard desktop computer, that has the raw processing power to handle a couple million inputs and outputs, but it sucks up a ton of power, it doesn’t have that many physical IO connections, it can’t survive being dropped or beaten around, it’s too big, and it’s not guaranteed to be easy to configure. In fact, it’s probably guaranteed to be a nightmare to configure at install and every repair session. The final nail in the coffin comes in terms of security. Common […]

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