Siemens SIRIUS 3RW5 - Page 26

Description
3.3 Functions of the 3RW5 Modbus communication module
SIRIUS 3RW5 Modbus communication module
26 Equipment Manual, 03/2020, A5E43676481002A/RS-AC/003
3.3.3 Assignment of data to Modbus addresses
All data of the 3RW5 soft starter are available in datasets or in the process image.
To be addressable via Modbus, the data in these datasets or in this process image are
converted to Modbus data formats.
Data access to
Data type according to Modbus nomenclature
Read-only bits
Discrete Inputs
Readable and writable bits
Coils
Read-only data sets and words (16-bit)
Input Registers
Read/write data sets and words Holding Registers
1 Coil / Discrete Input corresponds to 1 bit.
1 Register corresponds to 1 word (2 bytes).
You can find more information about access to the memory areas in chapter Function Codes
(Page 98).