Aiming at the requirement of cross-platform communication control between Siemens S7-1200 PLC and Atos servo proportional valve,a communication system based on Profinet protocol connection and programmed by TIA Portal automation platform was proposed.The system connected devices through ethernet communication cables,and FBD programming language was used to design communication programs.The functionality of the system is verified by running the system,and the analysis of the recorded data proves that the system runs stably and meets the design purpose of the system scheme.