KNX/EIB
Switch Actuator with Secure
49
Chapter 5. Description of communication object
The communication object is a media that the bus talks to the other devices, that means only
communication object can have the right to communicate to the bus. More details will be described
below.
NOTE: “C” in “Flag” column in the below table means that the object has a normal link to the bus;
“W” means the object value can be modified via the bus; “R” means the value of the object can be read
via the bus; “T” means that a telegram is transmitted when the object value has been modified; “U”
means that value response telegrams are interpreted as a write command, the value of the object is
updated.
5.1.
Communication
object “General”
There are 3 objects in “General”, which plays important role in the regular Switch actuator and
Heating actuator. See in Fig. 5.1 and functions are shown in Table 5.1.
Fig. 5.1 Communication object “General”
No.
Function
Object name
Data type
Flags
DPT
1
In operation
General
1bit
C,R,T
1.001 switch
This object is always enabled, used to send telegram “1” to the bus periodically to proof the device
is under normal working condition.
2
Safety Priority 1
General
1bit
C,W,U
1.003 enable
It is able to receive the 1bit telegram from the other devices (such as sensors and controllers and
so on) and modify the running condition of the other devices by this object. The other devices will be
judged as malfunction if this object doesn’t receive the relevant telegram for a certain time (which will
be defined in the window “All General”), and then it will trigger the set action of “Safety Priority 1” in “X:
Safety”. The priority of “Safety Priority 1” is lower only to “Forced operation” and “Safety Priority 2”.
3
Safety Priority 2
General
1bit
C,W,U
1.003 enable
This object has the same function as “Safety Priority 1”, but its priority level is secondary only to
“Force”.
Table 5.1 Communication object table “All General”
