Programmable Logic Controller (PLC) is a digital computer used for the automation of various electro-mechanical processes in industries. These controllers are specially designed to survive in harsh situations and shielded from heat, cold, dust, and moisture etc. PLC consists of a microprocessor which is programmed using the computer language.
The program is written on a computer and is downloaded to the PLC via cable. These loaded programs are stored in non – volatile memory of the PLC. During the transition of relay control panels to PLC, the hard wired relay logic was exchanged for the program fed by the user. A visual programming language known as the Ladder Logic was created to program the PLC. The hardware components of a PLC system are CPU, Memory, Input/Output, Power supply unit, and programming device.
The first PLC launched was designated 084 as it was the eighty fourth projects of Bedford Associates. Dick Morley worked on this project and is being considered as the Father of PLC. In the year 1977, the brand invented by Modicon was sold to Gould Electronics. The Gould Electronics later sold it to German Company AEG which was later taken over by French Schneider Electric.
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