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  How Do PLCs Work? PLCs are often described as small industrial computers with modular components designed to automate control processes. PLCs are the controllers behind most modern industrial automation. There are many components to a PLC, but most of them are often put within the following three categories: Processor (CPU) Inputs Outputs PLCs are complex and powerful computers. But, we will describe the function of a PLC in simple terms. The PLC takes inputs, performs logic on the information within the CPU, then activates or off outputs supported that logic. We'll get into more detail later, except, for now, consider it like this: The CPU monitors the inputs' status (ex. switch on, proximity sensor off, valve 40% open, etc.) The CPU takes the knowledge that it gets from the inputs, performs logic on the information. The CPU operates the outputs logic (ex. close up the motor, open valve, etc.) See the flowchart below for a visible representation of the s