3BHL000511P0003 ABB

ABB 3AFE61320954P0001
ABB 3BHE034863R0001
ABB 3BHE024855R0101
ABB 3BHE006412R0101
ABB 3BHB007209R0102

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Description

PLC的cpu内有指示程序步存储地址的程序计数器,在程序运行过程中,执行一步该计数器自动加1,程序从起始步(步序号为零)起依次执行到最终步(通常为end指令),然后再返回起始步循环运算。plc每完成一次循环操作所需的时间称为一个扫描周期。不同型号的plc,

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