What is a PLC?

PLC stands for “Programmable Logic Control”. It is an industrial grade computer designed to control manufacturing processes. Nowadays you find them in nearly every assembly line, but also more and more in the  building services system.

PLCs range from small non-modular devices used for processing simple binary signals up to large-rack mounted modular devices, which can perform analog processing, PID-Control, motor control, networking and more.

Major types of PLC

Major types of PLC - Pic 1 shows a Fixed or Compact PLC; Pic. 2 a Modular PLC

History of PLC

PLC have their origin in the late 1960’s in the US-automotive industry and were designed to replace the relay logic systems. Allen Bradly is here to mentioned in the first place.