I am reading Power Meter KWH float datatype in PLC using Unity Pro, so I need to use double words to read this value. Which FB I need to use to read this value and how to I change the MSW and LSB bit
You need to convert the tag value from INT to FLOAT using the conversion block in Unity. Also with this way you can interchange both the register addresses as per your requirement. Kindly check the attached snapshot for a sample block for reference.