扫描周期:是PLC每执行一遍从输入到输出所需的时间.
工作过程是
1.输入现场信号:在系统的控制下,顺序扫描各输入点,读入的输入点的状态.
2.顺序扫描用户程序中的各条指令,根据输入状态和指令内容进行逻辑运算.
3.并输出控制信号,根据逻辑运算的结果,输出状态寄存器向各输出点发出相应的控制信号.实现所要求的逻辑控制功能.


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