Siemens SINAMICS G120XA, Руководство по эксплуатации

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The response returns the corresponding data set:
Table 6-18 Slave response to the read request, example
Value Byte Description
11 h 0 Slave address
03 h
04 h
11 h
22 h
33 h
44 h 1
2
3
4
5
6 Function code
Number of bytes (4 bytes are returned)
Data first register "High"
Data first register "Low"
Data second register "High"
Data second register "Low"
xx h
xx h 7
8 CRC "Low"
CRC "High"
Table 6-19 Invalid read request
Read request Converter 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)
Structure of a write request via Modbus function code 06 (FC 06)
Start address is the holding register address.
Via FC 06, with one request, only precisely one register can be addressed. The value, which is
written to the addressed register, is contained in bytes 4 and 5 of the write request.
Table 6-20 Structure of a write request for slave number 17, example
Value Byte Description
11 h 0 Slave address
06 h
00 h
63 h
55 h
66 h 1
2
3
4
5 Function code
Register start address "High" (write register 40100)
Register start address "Low"
Register data "High"
Register data "Low"
xx h
xx h 6
7 CRC "Low"
CRC "High"
Advanced commissioning
6.2 Drive control
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
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