Acyclic Communication; Reading And Changing Parameters Via Data Set 47 - Siemens SINAMICS G120 Operating Instructions Manual

Configuring the fieldbus
7.2 Communication via PROFIBUS
7.2.6

Acyclic communication

7.2.6.1 Acyclic communication
As from performance level DP-V1, PROFIBUS communications offer acyclic data
communications apart from cyclic communications. You can parameterize and troubleshoot
(diagnostics) the inverter via acyclic data transfer. Acyclic data is transferred in parallel with
cyclic data transfer but with a lower priority.
The inverter supports the following data transfer types:
● Reading and writing parameters via "data set 47" (up to 240 bytes per write or read
● Reading-out profile-specific parameters
● Data exchange with a SIMATIC HMI (Human Machine Interface)
You can find a STEP 7 program example for acyclic data transfer in Section Application
examples (Page 291).
7.2.6.2

Reading and changing parameters via data set 47

Reading parameter values
Table 7- 13 Request to read parameters
Data block
Header
Address, parameter 1
Address, parameter 2
...
Address, parameter m
104
request)
Byte n
01 hex ... FF hex
Reference
01 hex
Attribute
10 hex:
Parameter value
20 hex:
Parameter description
0001 hex ... FFFF hex
Parameter number
Number of the 1st index
(for parameters without index: 0000 hex)
...
...
...
...
Bytes n + 1
01 hex: Read request
Numberof parameters (m)
Number of indices
00 hex ... EA hex
(for parameters without index: 00 hex)
0000 hex ... FFFF hex
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
n
0
01 hex ... 27 hex
2
4
6
8
...
...
...
...
SINAMICS G120C Inverter