LD3500W
LD3500W
LD3500W
现有一个检测0—3KPa的压力传感器用来检测水箱的液位高度，而水箱的高度 只有300mm,那怎样在程序里实现标度变换？
答：用差压变送器测液位，那是就是根据phg 1Kpa对应100MM＝＝0.1M
3KPA 对应300MM 懂？
用PID换算就是
可以外设(I/O)或以浮点格式输入过程变量。CRP_IN功能根据以下公式将PV_PER外设值转换为介于 -100和 +100 %间的浮点格式值：
PV_NORM功能根据以下公式统一CRP_IN输出的格式：
PV_NORM的输出 = (CPR_IN的输出) * PV_FAC + PV_OFF
PV_FAC的默认值为1，PV_OFF的默认值为0。
PV_FAC设置为300，PV_OFF为0即可，那么输出PV即为实际值（单位为MM）
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