Communication Via Data Set 47 - Siemens SINAMICS G150 Operating Instructions Manual

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 10 and 11 of the write request.
Table 6- 61
Value
MBAP header
06 h
00 h
63 h
55 h
66 h
The response returns register address (bytes 8 and 9) and the value (bytes 10 and 11),
which the higher-level control had written to the register.
Table 6- 62
Value
MBAP header
06 h
00 h
63 h
55 h
66 h
Table 6- 63
Write request
Incorrect address (a holding register address does not exist)
Write to a "read-only" register
Write to a reserved register
For Exception Code 4, via the holding register 40499, you can read out the internal drive
error code, which has occurred for the last parameter access via the holding register.
6.12.6

Communication via data set 47

Via FC 16, with one request, up to 122 registers can be written to directly one after the other,
while for Write Single Register (FC 06) you must individually write the header data for each
register.
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Structure of a write request for slave number 17, example
Byte Description
7 Function code
8 Register start address "High" (write register 40100)
9 Register start address "Low"
10 Register data "High"
11 Register data "Low"
Slave response to the write request, example
Byte Description
7 Function code
8 Register start address "High"
9 Register start address "Low"
10 Register data "High"
11 Register data "Low"
Invalid write request
6.12 Communication via MODBUS TCP
Inverter response
Exception Code 02 - invalid data
address
Exception Code 04 - device failure
Operation
405