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Appendix
A.2 Modbus RTU
SENTRON PAC3100
130
Manual, 07/2009, A5E02385159B-01
A.2.5 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.
NOTICE
Error in the case of inconsistent access to measured values
Please ensure the start offset of the register is correct when making read accesses.
Please ensure the start offset and the number of registers are correct when making write
accesses.
If a value consists of two registers, a read command applied in the second register, for
example, will generate an error code. SENTRON PAC will also output an error code if, for
example, a write operation ends in the middle of a multi-register value.
Table A- 7 Available measured variables
Abbr. in the "Access" column Abbreviation
R
Read; read access
W Write; write access
RW Read Write; read and write access
Offset Number of
registers
Name Format Unit Value range Access
1 2 Voltage a-n Float V - R
3 2 Voltage b-n Float V - R
5 2 Voltage c-n Float V - R
7 2 Voltage a-b Float V - R
9 2 Voltage b-c Float V - R
11 2 Voltage c-a Float V - R
13 2 Current a Float A - R
15 2 Current b Float A - R
17 2 Current c Float A - R
19 2 Apparent power a Float VA - R
21 2 Apparent power b Float VA - R
23 2 Apparent power c Float VA - R
25 2 Active power a Float W - R
27 2 Active power b Float W - R
29 2 Active power c Float W - R
31 2 Reactive power a (VAR1) Float var - R
33 2 Reactive power b (VAR1) Float var - R
35 2 Reactive power c (VAR1) Float var - R