Abstract
PLC programmable logic controller: PLC Programmable Logic Controller English name, Chinese called the programmable logic controller, the definition is: the operation of a digital electronic computing systems for environmental applications in the industrial design. PLC is based on electronic computers, and apply to the industrial scene, the work of the controller. It originated from relay control devices, but it does not relay device, through circuit to achieve control of the physical processes, and mainly rely on running in the memory stored in the PLC process, transform information into and out of control. It uses a programmable memory for its internal storage procedures, the implementation of logical, sequential control, timing, counting and arithmetic operations such as user-oriented instructions, and through digital or analog input / output control of all types mechanical or production process..
Key words: programmable logic controller (PLC)；mosaic compressoresignwing; controll
