、掉电次数及掉电时间累积值，防止人为或意外掉电造成累计值的偏差。
二、仪表外形及接线图（以下为基本配线，特殊订货请参考随机接线图）
SWP-LCD-NLT802-21-BC-HL－P－W－S,SWP-LCD-NLT802-82-AC-LH－N－T
SWP-LCD-NLT802-00,SWP-LCD-NLT802-01,SWP-LCD-NLT802-02,
SWP-LCD-NLT802-03,SWP-LCD-NLT802-04,SWP-LCD-NLT802-05
SWP-LCD-NLT802-20,SWP-LCD-NLT802-21,SWP-LCD-NLT802-22,
SWP-LCD-NLT802-23,SWP-LCD-NLT802-24,SWP-LCD-NLT802-25
SWP-LCD-NLT802-40,SWP-LCD-NLT802-41,SWP-LCD-NLT802-42,
SWP-LCD-NLT802-43,