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供我國使用的PLC的供電電源有兩種形式：交流220V  電源和直流供電電源（多為24V）。圖0提供的端子圖為交流供電，如圖1所示。圖中L表示火線、N表示零線，     表示接地。交流供電的PLC提供輔助直流電源，供輸入設備和部分擴展單元用。FX_2N系列PLC的輔助電源容量為250～460mA。在容量不夠的情況下，需要單獨提供直流電源

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