7958513 ABB

ABB Contactor A12-30-01
ABB 3HAC15879-1
ABB 21522012-430
ABB 3HAC14459-1
ABB 3HAC15571-1

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Description

PLC上电后,自动重复执行程序扫描和I/O扫描,即输入采样、用户程序执行和输出刷新三个阶段。完成上述三个阶段称作一个扫描周期。在输入采样阶段,PLC以扫描方式依次地读入所有输入状态和数据,并将它们存入I/O映象区中相应的单元内


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