重要的数据如装满某种材料的箱子中的当前位置或者正在进行某部分的计算的一些数据等等被汇集在一起并存在RAM寄存器中，这些经常性变化的数据不会自动的存储在PROM设备中，数据只是存储于RAM中，因此，当PLC断电并且没有RAM存储器备用电池的话，这些数据将会丢失.

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SLOAN A-56-A DIAPHRAGM WITH A-26 RING, LOT OF 18, I

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