BACnet Data Types

In the following table the BACnet data types are listed, which are used in the supported object properties and their correspondents in WinCC OA.

Note that data types, which are not listed in the table below, are not supported by the BACnet driver! That applies to the regarding object properties.

The WinCC OA BACnet driver chooses the correct transformation automatically via the object type and the property.

"Special format required" means that the BACnet property cannot be mapped directly on a WinCC OA data type because of a too complex structure. In that case a string in a special format is used in order to map the data types. This string must by analyzed assembled by the application to process this BACnet property.

BACnet Data Type	BACnet API Data Type specified (the prefix bacnetDT_ is here left out)	WinCC OA Data Type of the data point element	Read(R)/ Write(W)	Comment
Any	not applicable	not applicable	-	Only a specific value can be mapped.
BACnetARRAY[N] from BACnetActionList	ArrayOfBACnetActionList	string	R	Special format required.
BACnetARRAY[3] from BACnetTimeStamp		dyn_time
BACnetARRAY[7] from BACnetDailySchedule	ArrayOfBACnetDailySchedule	string	R	Special format required.
BACnetARRAY[N] from BACnetSpecialEvent	ArrayOfSpecialEvent	string	R	Special format required.
BACnetARRAY[N] from BOOLEAN		dyn_bool
BACnetARRAY[N] from CharacterString	ArrayOfCharacterString	dyn_string
BACnetARRAY[N] from ObjectIdentifier	ArrayOfBACnetObjectIdentifier	dyn_uint	R
BACnetARRAY[N] from Unsigned	ArrayOfUnsigned	dyn_uint
BACnetBinaryPV	Enumerated	uint	R/W
BACnetDateRange	DateRange	string	R
BACnetDateTime	DateTime	time
BACnetDeviceObject-PropertyReference	DeviceObjectPropertyReference	string	R	Contains the peripheral address string.
BACnetDeviceStatus	Enumerated	uint	R/W
BACnetEngineeringUnits	Enumerated	uint	R/W
BACnetEventParameter	EventParameter	string	R	Special format required.
BACnetEventState	Enumerated	uint	R/W
BACnetEvent-TransitionBits	BitString	bit32/dyn_bool	R	Transformation delivers for < 33 Bit -> bit32 >= 33 Bit -> dyn_bool
BACnetEventType	Enumerated	uint	R/W
BACnetLimitEnable	BitString	bit32/dyn_bool	R	Transformation delivers for < 33 Bit -> bit32 >= 33 Bit -> dyn_bool
BACnetNotifyType	Enumerated	uint	R/W
BACnetObjectIdentifier	ObjectIdentifier	uint
BACnetObjectProperty-Reference	ObjectPropertyReference	string	R	Contains the peripheral address string.
BACnetObjectTypes-Supported	BitString	bit32/dyn_bool	R	Transformation delivers for < 33 Bit -> bit32 >= 33 Bit -> dyn_bool
BACnetPolarity	Enumerated	uint	R/W
BACnetPriorityArray	PriorityArray	string	R	Special format required. The string format is a list with 16 elements in curly brackets . Every element contains either a value or "null", if the value is specified for the priority. e.g.: {null}{null}{1.23}{null}…{null}.
BACnetReliability	Enumerated	uint	R/W
BACnetSegmentation	Enumerated	uint	R/W
BACnetServices-Supported	BitString	bit32/dyn_bool	R	Transformation delivers for < 33 Bit -> bit32 >= 33 Bit -> dyn_bool
BACnetStatusFlags	BitString	bit32		Normally it is mapped on user bits. If a separate address has been specified, is the DPE of the data type bit32.
BACnetTimestamp	TimeStamp	time		In the BACnet TimeStamp you can distinguish between Time, SequenceNumber or BACnetDateTime Just the least can be mapped without difficulties.
BOOLEAN	Boolean	bool
CharacterString	CharacterString	string	R/W
Date	Date	time
INTEGER	SignedInteger	int	R/W
List of BACnetAddressBinding		string		Special format required.
List of BACnetCalendarEntry		string		Special format required.
List of BACnetCOVSubscription		string		Special format required.
List of BACnetDestination		string		Special format required.
List of BACnetRecipient		string		Special format required.
List of Unsigned		dyn_uint
REAL	Real	float	R/W
Time	Time	time		Time specification in days (hours, minutes, seconds and hundredth).
Unsigned	UnsignedInteger	uint	R/W
Unsigned16	UnsignedInteger	uint	R/W
Unsigned32	UnsignedInteger	uint	R/W