描述
电源回路PLC供电电源一般为AC85—240V（也有DC24V），适应电源范围较宽，但为了抗干扰，应加装电源净化元件（如电源滤波器、1：1隔离变压器等）。
PLC上DC24V电源的使用各公司PLC产品上一般都有DC24V电源，但该电源容量小，为几十毫安至几百毫安，用其带负载时要注意容量，同时作好防短路措施（因为该电源的过载或短路都将影响PLC的运行）。
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