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ABB i-bus
®
KNX
Group objects
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 331
8.5
Group objects Relay output
No.
Function
Group object name Data Type
Flag
44
Status Relay
Channel – Relay
1 bit
DPT 1.009
C, R, T
This group object is enabled if the parameter
Output is
is set to
Activated
in the
Relay output
parameter win-
dow.
The group object indicates the status of the relay depending on the option selected in the parameter
Object
value Status Relay
:
Telegram value:
•
1 = relay closed; 0 = relay open
•
0 = relay closed; 1= relay open
The status is sent depending on the option selected in the parameter
Send status values
(
Relay output
pa-
rameter window).
45
Switch relay
Channel – Relay
1 bit
DPT 1.001
C, W
This group object is enabled if the parameter
Output is
is set to
Activated
in the
Relay output
parameter win-
dow.
This group object switches the relay output.
Telegram value:
•
1: On
•
0: Off
Whether the relay opens or closes depends on the parametrization as a normally closed or normally open
contact.
Note
If the relay output is used as the controller's output drive (for an electric heater), the parameter
Switch
relay output independently of fan speed (including when fan = 0)
can be used to prevent the relay from
switching on when the fan is not running. This serves to protect the installation by ensuring that the fan
always transports the heat produced by an electric heater into the room. This prevents heat build-up
and the resulting fire risk.