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Appendix C Modbus addressing
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Appendix C Modbus addressing
Table C.1 Modbus functions
Function
Description
0x01
Read Coil Status
0x03
Read Holding Registers
0x04
Read Input Registers
0x05
Write Single Coil
0x06
Write Single Register
Table C.2 Modbus register
Parameter
Data type
Register
Function 0x04, read only
CH1 Input value
Decimal point
UINT16
0x0000
Value
UINT16
0x0001
Value (big-endian)
REAL32
0x0003, 0x0004
CH2 Input value
Decimal point
UINT16
0x0005
Value
UINT16
0x0006
Value (big-endian)
REAL32
0x0008, 0x0009
…
…
…
CH8 Input value
Decimal point
UINT16
0x0023
Value
UINT16
0x0024
Value (big-endian)
REAL32
0x0026, 0x0027
CH1 LU input value
Decimal point
UINT16
0x0040
Value
UINT16
0x0041
Value (big-endian)
REAL32
0x0043, 0x0044
CH2 LU input value
Decimal point
UINT16
0x0045
Value
UINT16
0x0046
Value (big-endian)
REAL32
0x0048, 0x0049
…
…
…
CH8 LU input value
Decimal point
UINT16
0x0063
Value
UINT16
0x0064
Value (big-endian)
REAL32
0x0066, 0x0067
Function 0x03/0x06, read/write
LU1 Input (
C.in
)
UINT16
0x0000
LU2 Input (
C.in
)
UINT16
0x0001
…
…
…
LU8 Input (
C.in
)
UINT16
0x0007
CH1 Setpoint (
C.SP
)
Decimal point
UINT16
0x0010
Value
UINT16
0x0011
CH1 Current setpoint (
C.SP.S
)
Decimal point
UINT16
0x0012
Value
UINT16
0x0013