Since long time no, the battery can not be charged and the voltage is too low, PLC program is lost.
由于长时间不用，电池得不到充电而电压过低，PLC程序丢失。
If the beeper beeps the reception is jammed or the voltage of the battery is too low.
如果蜂鸣器发声，表示接受受到了干扰或者电池电压过低。
If the beeper beeps the reception is jammed or the voltage of the battery is too low.
如果蜂鸣器发声，表示接受受到了干扰或者电池电压过低。
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