Acyclic Communication (General Parameter Access) Via Bacnet - Siemens SINAMICS G110M Function Manual

Communication via RS485
5.5 Communication via BACnet MS/TP - only CU230P-2 HVAC / BT
5.5.3

Acyclic communication (general parameter access) via BACnet

Acyclic communication or general parameter access is realized via BACnet objects DS47IN
and DS47OUT.
Acyclic communication uses the octet string value objects OSV0 and OSV1.
Instance
ID
OSV0
OSV1
The OSV are structured as follows:
Function
Code
2F (1 Byte)
Write parameter request with OSV0 and read with OSV1
To read parameter r0002 write the following values into the present value window of OSV0
Table 5- 33
2F h
0A h
80 h
01 h
01 h
01 h
10 h
01 h
0002 h
0000 h
If the request was successfully processed, then you can read out the response precisely
once from the present value window of the OSV1:
Table 5- 34
2F h
08 h
80 h
01 h
01 h
01 h
10 h
01 h
001F h
160
Object name Description
DS47IN Maximum length 242, of which two bytes header, 240
bytes user data
DS47OUT
Request length User data
(1 byte) Maximum 240 bytes
Write parameter request via OSV0
Byte Description
1 Function code 2F h (47),
2 Request length 10 bytes (0A h)
3 Request reference = 80 h
4 Request identifier = 1 h
5 DO-Id = 1
6 Number of parameters = 1
7 Attribute
8 Number of elements = 1
9,10 Parameter number = 2
11,12 Subindex = 0
Read parameter content via OSV1
Byte Description
1 Function code 2F h (47)
2 Response length 8 bytes
3 Request reference = 80 h
4 Request identifier = 1 h
5 DO-Id = 1
6 Number of parameters = 1
7 Format
8 Number of elements = 1
9,10 Parameter value 1F h = 31
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
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