3BHE037649R0101 PDD500A101 ABB

AX411/50001 ABB
BB510(DC5256) ABB
BRC300 ABB
CI520V1 ABB
CI610 ABB
CI615 ABB
CI626 ABB
CI626V1 ABB DCS
CI810B ABB

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描述

除了执行用户程序外,在每次循环过程中,PLC还要完成内部处理、通信处理等工作,一次循环可分为5个阶段(见图1-5)。PLC的这种周而复始的循环工作方式称为扫描工作方式。由于计算机执行指令的速度极高,从外部输入-输出关系来看,处理过程似乎是同时完成的。

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