5、原理及其优越性,应用PLC控制液体的自动混合,该程序可进行单周期或连续工作,正常工作时,至少完成一个周期,该程序具有一定的防止误动作能力。本论文从硬件设计、软件设计等多方面进行分析,对西门子S7-200的应用有一定的指导意义。关键词:可编程控制器PLC;液体混合装置;1金陵科技学院课程设计报告摘要Design of liquid mixing control system based on PLC ABSTRACT Programmable logic controller is called PLC for short.It develops fastly,
6、and has a wide use as industricial controlling device.It is a electronic system which oporates digitally,and it is designed for industrial enviroment application. The memory it adopts is programmable,and it stores user instruction.Through the digital or anolog input/output,PLC can
7、wok by set logic sequence,can time ,can count,can operate, and can complete other else functions.So it can control all kinds of mechanical procejures and production procejures. Because of its high performance ,mutiple functions like a computer,high flexibility,good commonality,sim