This system has high economy because of using itinerant monitor to analogy signals that made by PLC modules, using LED display and scan keyboard as press buttons that made by PLC dynamic I/O modules.

• 用PLC模块构成多路模拟量巡检，用动态I/O模块实现LED显示及扫描键盘按钮，使系统具有较高的经济性。