PLC control system is composed of PLC, frequency converter, proportional valve, LCD touch screen, relay and function key (indicator light).Control system is the core component of SCR system, responsible for sensor signal acquisition, ECU communication, actuator work, etc.In addition, the touch screen can realize the visualization of key parameters of the system, with functions such as alarm, emergency brake stop, manual control, etc.The control system is a collection, control, display, alarm in an integrated module, easy to install and maintain;And the structure design is reasonable, compact and beautiful.Matched with SCR system, it is widely used in ship engine, generator set and bench reconstruction.