GC646MBW001交换机模块全新二手1个起批，量大从优

GC646MBW001交换机模块全新二手1个起批，量大从优;
GC646MBW001交换机模块全新二手1个起批，量大从优;
GC646MBW001交换机模块全新二手1个起批，量大从优


　　日常维护
　　PLC的日常维护和保养比较简单，主要是更换丝和锂电池, 基本没有其它易损元器件。由于存放用户程序的随机存储器（RAM）、计数器和具有保持功能的辅助继电器等均用锂电池保护，锂电池的寿命大约为5年，当锂电池的电压逐渐降低到一定程度时，PLC基本单元上电池电压跌落到指示灯亮，提示用户注意有锂电池所支持的程序还可保留一周左右，必须更换电池，这是日常维护的主要内容。
　　调换锂电池的步骤为：
　　■在拆装前，应先让PLC通电15秒以上（这样可使作为存储器备用电源的电容器充电，在锂电池断开后，该电容可对PLC做短暂供电，以保护RAM 中的信息不丢失）；
　　■断开PLC的交流电源；
　　■打开基本单元的电池盖板；
　　■取下旧电池，装上新电池；
　　■盖上电池盖板。
　　注意更换电池时间要尽量短，一般不允许**过3分钟。如果时间过长，RAM中的程序将消失。
　　此外,应注意更换丝时要采用型号的产品。
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