Both digital and analog I/O are fundamental in automation technology. Output is the energy or information that leaves a system and is usually related to lighting devices, electric motors, alarms and so on. Input is the energy or information that enters a system and is usually related to sensors, switches, potentiometers, and so on. Input/Output (I/O) is central to every PLC. They are ideal for both simple and high-speed machine control and can be found in assembly equipment, motion control and dispensing systems. PLCs are best suited for simpler processes and smaller automation projects that do not require rapid scalability. ![]() PLCs monitor, control and communicate automated processes and act as the physical interface between devices and a SCADA or HMI system. Programmable Logic Controllers (PLCs) are computer control systems that detect the state of all input devices connected to it, make a decision based on a user-created program and then, output commands to any devices connected to it.
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