以PLC 作控制器，結(jié)合溫度變送器、液位變送器以及晶閘管和變頻器等執(zhí)行元件，組成電熱鍋爐溫度-液位雙回路控制系統(tǒng)，詳細(xì)介紹了控制系統(tǒng)的構(gòu)成原理、硬件配置和軟件控制流程。系統(tǒng)中的PID 調(diào)節(jié)功能用PLC 集成的PID 指令實(shí)現(xiàn)。在實(shí)驗(yàn)室進(jìn)行了系統(tǒng)
調(diào)試，收到了比較滿意的控制效果。系統(tǒng)安全、可靠、易于實(shí)現(xiàn)、維修方便。
關(guān)鍵詞：PLC；電熱鍋爐；PID；雙回路控制
Double-loop control system of electrothermal boiler’ s temperature and level
REN JUNJIE LI HONGXING LI YONGXIA ZHANG YINONG (Beijing Union University，Beijing，China) Abstract: Based on PLC, combined with temperature transmitter, level transmitter, thyristor and frequency converter, a double-loop control system of electrothermal boiler’ s temperature and level is composed。The structure and control principle are introduced in details. The hardware configuration and software control flowchart are also described. The PID function is achieved with the PID instruction integrated in PLC. The system is debugged in the laboratory and a satisfactory control can be received.
Key words： PLC Eectrothermal boiler PID Double-loop control