摘要该文主要讨论了联华集团的基于ＰＬＣ温度控制系统的设计和实现、以及上位机和下位机的软件编程的方法和技巧。This essay deals with a method of temperature control system based on PLC, and gives the technology of software design using WinCC and STEP 7 .
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