C h a p t e r 4 O p e r a t i o n
4 - 11
4_
Block transmission:
Mirror the address of the to-be-read measured values to sequential Modbus
addresses. The mirrored addresses are 0x100–0x1E7. The default is 0xFFFF.
Set up Steps
1. Write the address of the to-be-read measured values into sequential Modbus addresses
0x50C–0x551 with function code 0x06 (single write) or 0x10 (multi-write).
2. Once you complete Step 1, you can read the mirrored Modbus address 0x600–0x645 with function
code 0x03 (multi-read) for the measured values.
Example
1. You can use function code 0x06 (single write) or 0x10 (multi-write) to read the average Voltage L-N
value. Write the value 0x100 into Modbus 0x50C and the value 0x101 into Modbus 0x50D in a
consecutive order to read the average Voltage L-N value (Modbus 0x100–0x101).
2. You can use function code 0x06 (single write) or 0x10 (multi-write), to read the average current value.
Write the value 0x126 into Modbus 0x50E and the value 0x127 into Modbus 0x50F in a consecutive
order to read the average current value (Modbus 0x126–0x127). Refer to section 5.1 for more
information on the codes and Modbus addresses.
3. Once you complete Step 1, you can read mirrored Modbus address 0x600–0x601 with function code
0x03 (multi-read). After the value is converted to IEEE754 format, you can read the average Voltage
L-N value. You can also read mirrored Modbus address 0x602–0x603 with function code 0x03
(multi-read). After the value is converted to IEEE754 format, you can read the average current value.
4.4
Power Analysis Values
4.4.1
Total Harmonic Distortion Measurement
The total harmonic distortion (THD) is a measurement of the harmonic distortion and is defined as the ratio
between the power of the harmonic frequencies above the base frequency and the power of the base frequency.
The total harmonic distortions for current and voltage are calculated using the following formulas.
Total Harmonic
Distortion for Current
Total Harmonic
Distortion for Voltage
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