Introduction Through a variety of sensors to collect signal of the mechnical and electrical equipment in the whole plant ,then centralized to the PLC to operate ,set the steps according to the demands and send a signal to control the device to run.Have tje omtegrated function of system protection,centralized monotoring ,remote operation,optimized the operation. Uses It helps to save energy up to 50%,saving labor above 60%,improving production efficiency above 30%.Keep tidy enviroment in production workshop so as to improve corporate image.Symbol shown on PLC and marked on virgin pipe to avoid human mistake.