Siemens SINAMICS S120 Series - Page 175

Communication via Modbus TCP
6.5 Write and read access using function codes
Communication
Function Manual, 12/2018, 6SL3097-5BD00-0BP0
173
The response returns the corresponding data set:
Table 6- 5 Device response to the read request, example
Value
Byte
Description
MBAP header
03 h
04 h
11 h
22 h
33 h
44 h
7
8
9
10
11
12
Number of bytes (4 bytes are returned)
Data first register "High"
Data first register "Low"
Data second register "High"
Data second register "Low"
Table 6- 6 Invalid read request
Read request
Inverter response
Invalid register address
Exception code 02 (invalid data address)
Read a write-only register
Telegram in which all values are set to 0.
Read a reserved register
Controller addresses more than 125 registers
Exception code 03 (invalid data value)
The start address and the number of registers of an
address are located outside of a defined register
block
Exception code 02 (invalid data address)