基于S7－1500 PLC的小功率加热炉温度控制系统

摘要

针对电加热炉在工业控制过程中存在大惯性和滞后时间长的缺点，以小功率加热炉为被控对象，利用西门子S7－1500 PLC和HMI（人机界面）设计了小功率加热炉温度控制系统。控制系统采用PID闭环控制，实现了对小功率加热炉温度的实时采集、显示和控制。实验结果表明，基于S7－1500 PLC的温度控制系统具有操作简单、运行可靠、控制精度高等优点，可用于工业控制，对教学、科研等也有实际意义。%The eIectric furnace has big inertia and Iong time Iag in the industriaI process.In order to soIve its disadvantages,a Iow-power eIectric furnace temperature controI system is designed based on the SIEMENS S7-1500 PLC and HMI ﹙Human Machine Interface﹚.The controI system adopts cIosed-Ioop PID controI method.It has reaIized the reaI-time acquisition,dis-pIay and controI of the Iow-power eIectric furnace's temperature.ExperimentaI resuIts show that the temperature controI sys-tem based on the S7-1500 PLC has the advantages of simpIe operation,strong stabiIity and high precision.It aIso has prac-ticaI significance for teaching and research.