Programs to control machine operation are typically stored in battery-backed-up or non-volatile memory. PLCs are designed for multiple arrangements of digital and analog inputs and outputs, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. PLCs are used in many machines, in many industries. ![]() ![]() The name of this language implies that the control logic of the earlier days, which was built from relays, is being simulated.Ī programmable logic controller, PLC, or programmable controller is a digital computer used for automation of typically industrial electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures. It uses a language called "Relay Ladder" or RLL (Relay Ladder Logic). The PLC has input lines, to which sensors are connected to notify of events (such as temperature above/below a certain level, liquid level reached, etc.), and output lines, to which actuators are connected to affect or signal reactions to the incoming events (such as start an engine, open/close a valve, and so on). This OS is highly specialized and optimized to handle incoming events in real time, i.e., at the time of their occurrence. ![]() Introduction What is a Programmable Logic Controller (PLC)? Ī Programmable Logic Controller, or PLC, is more or less a small computer with a built-in operating system (OS).
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