描述
PLC一般使用220V交流电源或24V直流电源。内部的开关电源为各模块提供DC5V，±12V，24V等直流电源。小型PLC一般都可以为输入电路和外部的电子传感器(如接近开关)提供24V直流电源，驱动PLC负载的直流电源一般由用户提供。
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