What is a PLC? Programmable Logic Controllers (PLCs) are small, versatile, and powerful, stand alone industrial control systems. Similar to the computer on your desk, PLCs are standard package units, with some options for inputs and outputs, memory, and CPU power. PLCs can be user programmed to perform an infinite variety of jobs. Common control applications for PLCs vary from building alarm systems, robot welders, assembly line processes, and of course elevator control systems. At Lardner Elevator we use PLCs for many applications. Some of these applications may be to replace obsolete electro-mechanical components on existing control panels such as, counters, timers, stepping switches, etc..to replacing entire elevator control systems. A few manufactures of PLCs: Automation Direct (PLC Direct)
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 Programmable Logic Controller
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