User Manual

Logical I/O blocks
Addressing the I/O blocks
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The BACnet Device as BACnet Server supports a maximum of 400
subscriptions from BACnet clients or from other BACnet devices via the
BACnetReference.
A BACnet device operating as a BACnet client can also accommodate a
maximum of 100 subscriptions to other values via the BACnetReference.
If the COV procedure is selected, COVIncrement is used for analog objects to
define the value by which the present value must change to initiate a COV
event.
Output objects can write their Present_Value to the properties of other objects
or command other value or output object.
Write without priority: Optional address string-Par(P=Number) no available.
Command with priority: Optional address string-Par(P=Number) available.
The value subscribed to must be available in the same BACnet network. Avoid a
COV across sites.
The DeviceID is used to access and subscribe freely to values in different
BACnet devices (especially in the case of third-party integration). The syntax is
as follows:
B=[DeviceID]Objectname – where the object name can be any string required.
The DeviceID is entered in decimal (instance number or entire ObjectID).
PPS2 addressing
A PPS2 address is required when values are to be transmitted via the PPS2
interface. Addressing takes place via the input/output address [IOAddr] and
always starts with the prefix "Q=".
Up to five room units can be connected to one Desigo PX automation station
and addressed via the PPS2 interface. The addressing syntax is as follows:
Q=RoomUnitNumber.Object(Profile)
Example: Q=1.40 (1)
The functions available in the room unit are mapped directly to the I/O blocks.
The following elements of the address are predefined:
Type (standard BACnet objects) Room unit
number
Object Object description Profile
1
Example
Analog input 1…5 24 Setpoint correction – Q=1.24
Analog output 1…5 24 Setpoint correction – Q=2.24
Analog input 1…5 40 Room temperature 0, 1…6 Q=1.40
1
Analog output 1…5 195 Room temperature display – Q=5.195
Multistate input 1…5 205 Mode – Q=4.205
Multistate output 1…5 205 Mode – Q=2.205
Multistate output 1…5 206 Heating/Cooling display – Q=3.206
Key
1
The Profile relates to the configuration number shown in the next table.
The room unit is configured with this configuration number and appended to
the Room temperature object. Other objects are not assigned a configuration
number. Only the relevant operating and process values are mapped in the I/O
blocks, rather than all objects of a room unit.
Six profiles have been defined to keep both the memory requirements and the
demands placed upon the user in practice to a reasonable level. If no profile
information is supplied, the predefined device-specific default value [DefVal] is
used. As an exception in the case of the QAX units, Profile No. 5 is used.
Data output using
WriteProperty
COV across sites
Address syntax