DTDX991A 61430001-UW ABB

SC520
DS200DCFBG1BJB
DS200DCFBG1BLC
9324-RLD300NXENM
SST-PFB3-VME
FB201
F35
UAC389AE02
DS200DCFBG1BNC
SPNPM22
3500/22M

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描述

在继电器控制线路中,当电源接通时,线路中各继电器都处于受制约状态,该合的合,该断的断。而在PLC的梯形图中,各“软继电器”都处于周期性循环扫描接通中,从客观上看,每个“软继电器”受条件制约,接通时间是短暂的。也就是说继电器在控制的工作方式是并行的,而PLC的工作方式是串行的。

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