Delta DPM-C520, Operation Manual

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D
P M - C
5 2 0 / C 5 2 0 W O p e r a t i o n M a n u a l
4 - 8
_4
Pi ck up
Set point
Dropo ut
Se tpoi nt
P ic kup
Ti m e Del ay
A l arm Peri od
Dropout
Tim e Del ay
4.2.12 Parameter Grouping Setup

All electricity data can be combined as a parameter group that allows master controllers to access. This
function reduces reading time as well as enhances real-time data accessibility of the master controllers

Transmission setting: The to-be-read measured parameter address is written in the consecutive Modbus
addresses. The starting address is from 0x100 to 0x18B and the factory default is 0xFFFF.

Steps:
Use the function code 0x06 (single writing) or 0x10 (multiple writings) to write parameter-related Modbus
address in Modbus addresses 0x50C~0x515 consecutively. And after calculation, the values will be
stored in Modbus addresses 0x600~0x609. Use the function code 0x03 (multiple readings) to read the
values in Modbus addresses 0x600~0x609.

Example:
If you need the measured parameters of average phase voltage (Modbus addresses 0x106~0x107), you
can use the function code 0x06 (single writing) or 0x10 (multiple writings) to write the Modbus address
0x106 in 0x50C and the Modbus address 0x107 in 0x50D. The order matters; thus the parameter-related
Modbus addresses in 0x50C and 0x50D are not interchangeable. After calculation, the value is stored in
0x600 for 0x106 and in 0x601 for 0x107. Use the function code 0x03 (multiple readings) to read the
Modbus addresses 0x600~0x601. And after IEEE754 conversion, you can have values of the average
phase voltage. See the table below for a quick understanding on the setting.
If you need the measured parameters of average phase current (Modbus addresses 0x126~0x127), you
can use the function code 0x06 (single writing) or 0x10 (multiple writings) to write the Modbus address
0x126 in 0x50E and the Modbus address 0x127 in 0x50F. The order matters; thus the parameter-related
Modbus addresses in 0x50E and 0x50F are not interchangeable. After calculation, the value is stored in
0x602 for 0x126 and in 0x603 for 0x127. Use the function code 0x03 (multiple readings) to read the
Modbus addresses 0x602~0x603. And after IEEE 754 conversion, you can have values of the average
phase voltage.