它指的是在PLC电源模板上的串口连接器上的接口，当串口不工作时此灯熄灭.P1灯闪烁表明数据正在通过串口1的RS-232接口传输数据，当串口不工作时此灯熄灭.P2灯闪烁表明数据正在通过串口2的RS485接口传输数据，当串口不工作时此灯熄灭.

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