2097-V32PR0 A-B 程序扫描顺序

Bosch BM-ASI 1 824 484 020
A-B 1756-ENBT
A-B 1756-ENBT
SCHNEIDER 140CRA93100
A-B 1756-ENBT
A-B 1756-ENBT
A-B 1756-OF8
A-B 1769-OF4CI
FOXBORO FBM206
WESTINGHOUSE 5X00119G01
ENTETASYS STK-RPS-150PS
A-B 1756-L55
A-B 2711-K5A5
A-B 1769-OF8C
WESTINGHOUSE 5X00119G01
A-B 1747-ASB
A-B 1769-OF8C
WESTINGHOUSE 5X00119G01
ABB SNAT604IFS
FOXBORO 871EC-REO

Description

在继电器控制电路中,当电源接通时,电路中所有继电器都处于受制约状态,即该吸合的继电器都同时吸合,不该吸合的继电器受某种条件限制而不能吸合,这种工作方式称为并行工作方式。而PLC的用户程序是按一定顺序循环执行,所以各软继电器都处于周期性循环扫描接通中,受同一条件制约的各个继电器的动作次序决定于程序扫描顺序

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