从工作方式上看，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，这种工作方式称为串行工作方式。
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