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Appendix
A.1 Modbus
PAC3120 and PAC3220
Equipment Manual, 10/2019,
L1V30425208F-01
113
A.1.3 Modbus measured variables with the function codes 0x03 and 0x04
Addressing the measured variables
You can use the Modbus function codes 0x03 and 0x04 on all the measured variables listed
below.
Note
Error in the case of inconsistent access to measured values
Please ensure the start offset of the register is correct for read access operations.
Please ensure the start offset and the number of registers are correct for write access
operations.
If a value consists of two registers, a read command applied in the second register, for
example, will generate an error code. The device will also output an error code if, for
example, a write operation ends in the middle of a multi-register value.
Table A- 3 Meaning of the abbreviations in the "Access" column of the table headed "Available measured variables" be-
low
Abbreviation Meaning
R Read; read access
W Write; write access
RW Read Write; read and write access
Table A- 4 Available measured variables
Offset Number of
registers
Name Format Unit Value range Access
1 2 Voltage L1-N Float V – R
3 2 Voltage L2-N Float V – R
5 2 Voltage L3-N Float V – R
7 2 Voltage L1-L2 Float V – R
9 2 Voltage L2-L3 Float V – R
11 2 Voltage L3-L1 Float V – R
13 2 Current L1 Float A – R
15 2 Current L2 Float A – R
17 2 Current L3 Float A – R
19 2 Apparent power L1 Float VA – R
21 2 Apparent power L2 Float VA – R
23 2 Apparent power L3 Float VA – R
25 2 Active power L1 Float W – R
27 2 Active power L2 Float W – R