I am using PLC S7 1200 to read modbus data of SMART 7KT Power Monitoring, I am having problem that the total net KWh (8400 -> 8404) and KVAh (9684 -> 9687) are deviating a few units, and the parameters other than voltage and current, read the correct data, anyone who has encountered this error please give me an answer.

Closed cause question posted twice.

The second thread with the subject When reading the Modbus data from SMART 7KT Power Monitoring, the total net KWh and KWh differ by a few units is published within the conference Low-Voltage Power Distribution and Installation Technology.