5X00034G01
5X00034G01
5X00034G01
PLC以微处理器为核心,具有微机的许多特点,但它的工作方式却与微机有很大不同。
微机一般采用等待命令的工作方式工作。
PLC是按集中输入、集中输出,周期性循环扫描的方式进行工作的。每一次循环扫描所用的时间称为一个扫描周期。
对每个程序,CPU从***条指令开始执行,按顺序逐条地执行指令做周期性的程序循环扫描,如果无跳转指令,则从***条指令开始逐条顺序执行用户程序,直至结束又返回***条指令,如此周而复始不断循环。
PLC在每次扫描工作过程中除了执行用户程序外,还要完成内部处理、输入采样、通信服务、程序执行、自诊断、输出刷新等工作。PLC工作的全过程包括三个部分,即上电处理、扫描过程和出错处理。PLC工作的全过程可用图4所示的运行框图来表示。
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