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What is a PLC?

Programmable logic controllers (PLCs) are used to automate processes. Most of the programmable logic controllers used in industry are modular systems. Programmable logic controllers record the input signals and, based on their values, control the receivers connected to the outputs. Input devices include pressure sensors, temperature probes, limit switches, approach switches, light barriers, impulse transmitters, etc. The output devices are used to control actuators such as motors and valves and transmit alarms and messages. The controller includes AND/OR functions, counters, markers, and timers. This means that it can be used as a time-controlled system. Programmable logic controllers can also carry out control functions, e. g. control the transmembrane pressure during ultrafiltration.

[GMP MANUAL, Chapter 4.D.2]

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