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过程自动控制系统用的现代可编程逻辑控制器(PLC)具有16或32个输入端,能够接受24到120V的交流电压。只要采用一个电路(采用一个隔离继电器和一个具有施密特触发器的RC网络,以使进入处理器的所有信
Modern programmable logic controllers (PLCs) for process automation systems have 16 or 32 inputs and are capable of accepting AC voltages from 24 to 120V. Just use a circuit (using an isolation relay and an RC network with a Schmitt trigger, so that all incoming signals to the processor