不要为打翻的牛奶而哭泣,相信船到桥头自然直,积极的去面对下一件事情。
3. 存储器
可编程控制器配有两种存储器:系统存储器和用户存储器。
系统存储器:存放系统管理程序。
用户存储器:存放用户编制的控制程序。
4. 输入接口电路
plc通过输入单元可实现将不同输入电路的电平进行转换,转换成plc所需的标准电平供plc进行处理。
接到plc输入接口的输入器件是:各种开关、按钮、传感器等。各种plc的输入电路大都相同,plc输入电路中有光耦合器隔离,并设有rc滤波器,用以消除输入触点的抖动和外部噪声干扰。plc输入电路通常有三种类型:直流(12∽24)v输入、交流(100∽120)v输入与交流(200∽240)v输入和交直流(12∽24)v输入
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