Programmable Logic Control (PLC)

Analog inputs provide the Controller with a value. The resolution of the value is often an important consideration, usually expressed in bits (8-bit, 16-bit, etc.).
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Analog outputs provide devices with a signal based on a value from the Controller. The resolution of the value is often important, usually expressed in bits (8-bit, 16-bit, etc.).
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Exchanging data between Controllers and computers is common.
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Discrete, or digital, inputs simply provide on/off information to the Controller.
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Discrete, or digital, outputs simply turn on/off devices, based on logic from the Controller.
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A variety of sensors, switches, and other Input devices detect movement, light, temperature, and many other variables. There are two broad categories of Input Devices: discrete (or digital), and analog.
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Contactors, motor starters, valves, and other Output devices are used to turn on/off motors, lights, heating elements, and other equipment. Both Discrete and Analog Output devices are available.
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Refer to manufacturer documents to choose a PLC family, CPU, and additional components, based on I/O and advanced capabilities required.
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Signal Conditioners are often required with Analog I/O, to convert between the signal level of the Controller I/O and the signal level of the Devices they are connected to.
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Most PLCs have software available for entering the program in the PLC, and monitoring debugging the program operation and I/O status.
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