SIEMENS S7-200 PLC控制系统替代继电器电路的应用设计

Application Design of SIEMENS S7-200 PLC Control System to Replace Relay Circuit

片碱包装工段因工作环境中的片碱粉尘较多,继电器电路的触点和线圈腐蚀严重,造成片碱包装装置误动作停车的事故频繁发生。为解决此问题,本文采用PLC代替继电器电路实现对装置的控制,通过技改,采用SIEMENS S7-200 PLC从根本上避免继电器电气元件因被腐蚀造成的停车事故。

Due to the high amount of flake alkali dust in the working environment,the contact and coil corrosion of the relay circuit in the flake alkali packaging section often leads to accidents of misoperation and shutdown of the flake alkali packaging device.To solve this problem,this paper uses PLC instead of relay circuit to control the device.Through technological transformation,SIEMENS S7-200 fundamentally avoids shutdown accidents caused by corrosion of relay electrical components.