DS200TBQAG1ABB GE

IS215VCMIH2BE GE
IS215ACLEH1AN GE
151X1207DC06SA01 GE
DS3800NGDD GE
IS200JPDMG1A GE
342A4922P28V500DH GE
IS20OTDBSH6ABC GE
IS20OTPROH1BCB GE

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描述

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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