Siemens SIMATIC PN/BACnet LINK Operating Instructions Manual page 40

Functions
4.5 Acyclic data exchange
WriteProperty
For a "WriteProperty", in addition to the parameters required for "ReadProperty", the data
record must also contain the property value and the priority of the write job.
Table 4- 7
Element
PNreq
BNreq
DNET
Device ID
ObjectID
PropertyID
ArrayIndex
Priority
Data type
Len
Value
The result is located in a data record, which must then be read.
Table 4- 8
Element
PNresp
BNresp
DNET/ErrorClass
Device/ErrorCode
ObjectID
PropertyID
ArrayIndex
40
WRREC (Write data record) - RecordWrite data record structure for WriteProperty
service
Type Meaning
UINT8 PROFINET service: Property access = 1
UINT8 BACnet service: "WriteProperty" = 0x0F = 15
UINT32 Network number
UINT32 BACnet device instance number
UINT32 BACnet ObjectID (type and instance)
UINT32 PropertyID
INT32 Property index (-1 = no index)
UINT16 BACnet priority (1 ... 16)
UINT16 BACnet data type of the property (according to BACnet specification)
UINT16 Length of value in bytes
Array BACnet property value in ASN.1 format
RDREC (Read data record) - data record structure for WriteProperty result
Type Meaning
UINT8 PROFINET error number (0 == no error)
UINT8 BACnet error number (0 == no error)
UINT32 Network number (BNresp == 0)/BACnet error class (BNresp != 0)
UINT32 BACnet device instance (BNresp == 0)/BACnet error code
(BNresp != 0)
UINT32 BACnet ObjectID (type and instance)
UINT32 PropertyID
INT32 Property index (-1 = no index)
Operating Instructions, 10/2017, A5E39895543-AA
PN/BACnet LINK