Design of a dynamic gas distribution control system based on PLC

Two kinds of standard gas configuration methods are analyzed. Aiming at the problem that the standard gas concentration obtained by conventional dynamic gas distribution method is unstable, a dynamic gas distribution system is designed, which can obtain the standard gas with arbitrary concentration simply, efficiently and accurately. In the dynamic gas distribution system, in order to continuously and stably obtain a certain concentration of gas, improve the response speed of the system, and reduce the error caused by system lag, S7-300 PLC is selected as the main control core, and PID controller is introduced into the control system as the main control strategy, the dynamic gas distribution principle is designed, and the control system framework is built. And complete the hardware configuration in STEP7. The experimental scheme of the conventional gas distribution system and the dynamic gas distribution system with PID as the control core is designed. Through the experimental analysis, the fluctuation of the dynamic gas allocation system designed in this paper is significantly reduced when it reaches the effective value, and it is more stable and has good controllability.