Modbus Measured Variables With The Function Codes 0X03 And 0X04; Table A- 7 Available Measured Variables - Siemens SENTRON PAC3100 Manual

Appendix
A.2 Modbus RTU
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
R
W
RW
Offset Number of Name
registers
1 2 Voltage a-n
3 2 Voltage b-n
5 2 Voltage c-n
7 2 Voltage a-b
9 2 Voltage b-c
11 2 Voltage c-a
13 2 Current a
15 2 Current b
17 2 Current c
19 2 Apparent power a
21 2 Apparent power b
23 2 Apparent power c
25 2 Active power a
27 2 Active power b
29 2 Active power c
31 2 Reactive power a (VAR1)
33 2 Reactive power b (VAR1)
35 2 Reactive power c (VAR1)
130
Abbreviation
Read; read access
Write; write access
Read Write; read and write access
Format Unit
Float V
Float V
Float V
Float V
Float V
Float V
Float A
Float A
Float A
Float VA
Float VA
Float VA
Float W
Float W
Float W
Float var
Float var
Float var
Value range Access
- R
- R
- R
- R
- R
- R
- R
- R
- R
- R
- R
- R
- R
- R
- R
- R
- R
- R
SENTRON PAC3100
Manual, 07/2009, A5E02385159B-01