描述
电源模块选择仅对于模块式结构的PLC而言，对于整体式PLC不存在电源的选择。
电源模块的选择主要考虑电源输出额定电流和电源输入电压。电源模块的输出额定电流必须大于CPU模块、I／O模块和其它特殊模块等消耗电流的总和，同时还应考虑今后I／O模块的扩展等因素；电源输入电压一般根据现场的实际需要而定。
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