描述
在扫描周期计算处理阶段，若设定扫描周期为固定值（可由用户通过DM6619设定），则进入等待循环，直到该指定值到达，再往下进行；若设定扫描周期为不定值（即决定于用户程序的长短等），则进行扫描周期的计算。
在I/O刷新阶段，进行I/O刷新。CPU从输入电路中读取各输入点状态，并将此状态写入输入映像寄存器中；同时将元件映像寄存器的状态(1/0)传送到输出锁存电路，再经输出电路隔离和功率放大，驱动外部负载。
在外设端口服务阶段，完成与外设端口连接的外围设备或通信适配器的通信处理。循环扫描的工作方式，既简单直观，又便于用户程序的设计，且为PLC的可靠运行提供了可靠地保障。这种工作方式，使PLC一旦扫描到用户程序某一指令，经处理后，其处理结果就可立即被用户程序中后续扫描到的指令所应用，而且PLC可通过CPU内部设置的监视定时器，监视每次扫描是否超过规定时间，以便有效地避免因CPU内部故障而导致程序进入死循环的情况。
欧美品牌停产的，常用的“PLC”备品备件
我司产品应用于以下领域：
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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