Addressing
Last updated
Last updated
For addressing a single value, use the following address format:
To address one of the bits of the word, you must use the following format:
An array of values can be set using the following address format:
Note that zero-based addressing is used for all types of data areas. This means that the addresses entered by the user are not shifted by 1 when constructing a Modbus frame
The table below maps data areas to supported address ranges, data types and access modes.
For byte data type you must specify the byte order in the word (MSB or LSB) after the @ character, for example: 400000@MSB
The following are examples of available addresses:
400020@INT
300001.14
300999@FLOAT
400005[10]INT
100035[12]
000021
Data Area
Address Range
Data Type
OPC UA Access Mode
Output Coils
0 - 65535
Boolean
Read/Write
Input Coils
100000 - 165535
Boolean
Read Only,
Read/Write (in slave mode)
Internal Registers
300000 - 365535
Boolean, Byte, Word,
Int, DWord, DInt,
Float, Double, QWord, Long, String
Read Only,
Read/Write (in slave mode)
Holding Registers
400000 - 465535
Boolean, Byte, Word,
Int, DWord, DInt,
Float, Double, QWord, Long, String
Read/Write