1791-16BC
1791-16BC
1791-16BC
/O电路是很多的，每一输入点或输出点都要有一个I或O电路。PLC有多I/O用点，一般也就有个I/O用电路。但由于它们都是由高度集成化的电路组成的，所以，所占体积并不大。
输入电路时刻监视着输入状况，并将其暂存于输入暂存器中。每一输入点都有一个对应的存储其信息的暂存器。
输出电路要把输出锁存器的信息传送给输出点。输出锁存器与输出点也是一一对应的
这里的输入暂存器及输出锁存器实际就是PLC处理器I/O口的寄存器。它们与计算机内存交换信息通过计算机总线，并主要由运行系统程序实现。把输人暂存器的信息读到PLC的内存中，称输入刷新。PLC内存有专门开辟的存放输入信息的映射区。这个区的每一对应位（bit）称之为输入继电器，或称软接点。这些位置成1，表示接点通，置成0为接点断。由于它的状态是由输入刷新得到的，所以，它反映的就是输入状态。
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厦门泰尼电气有限公司
Xiamen Thani Electric Co.,Ltd
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