Siemens SINAMICS S150 NEMA Operating Instructions Manual page 427

Table 6- 63
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- 64
Value
MBAP header
06 h
00 h
63 h
55 h
66 h
Table 6- 65
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.
Header
In addition to the transfer type, the start address and the number of the following registers in
the header.
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
Structure of a write request for device 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"
Device 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
425