P0926JM FOXBORO

ECI-17047 AB
74101-201-01 AB
A74100-884-02 AB
A74101-375-02 AB PLC
A74101-377-02 AB
5143-M70/31FF AB PLC
25301-540-03 AB
5146-M120/35FF AB PLC
1336-PB-SP23C AB PLC
74101-772-54 AB PLC
1336T-MCB-SP51B AB PLC

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描述

继电器控制线路是由许多真正的硬件继电器组成的。而PLC是由许多“软继电器”组成的,这些“继电器”实际上是存储器中的触发器,可以置“0”或置“1”。硬继电器的触点数有限,一般只有4至8对;而“软继电器”可供编程的触点数有无限对,因为触发器状态可取用任意次。
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