Siemens SIRIUS 3RW5 series Manual page 52

Messages and diagnostics
7.2 Function Codes
Access to memory areas
Two memory areas are used in the 3RW5 Soft Starter:
● A memory area for addressing the bit information
● A memory area for addressing the register information
The Function Codes for bit information (01, 02, 05, 15) thus always access the bit memory
area. The Function Codes for register information (03, 04, 06, 16, 23) always access the
register memory area.
Whether information is read-only (r) or read/writeable (r/w) is stated in the data tables in
chapter Data tables (Page 75).
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SIRIUS 3RW5 Modbus TCP communication module
Manual, 03/2018, A5E43676481002A/RS-AA/001