ABB i-bus® KNX
PLANNING AND APPLICATION
Note
The same forced operation state as for bus voltage failure applies after bus voltage recovery.
Forced operation is deactivated on an ETS reset.
Forced operation, 1-bit
A state that is set if forced operation is activated can be parameterized with 1-bit forced operation. It
can additionally be defined whether activation is to take place via the value 1 or 0.
Control values and the state of the outputs can be defined in the device-specific parameters → parame-
ter
Forced operation, 2-bit
With 2-bit forced operation, two states are specified that are set if forced operation is activated. The
states are activated via the 2-bit group object. The first bit indicates whether forced operation is active
(bit 1 (High) = 1) or inactive (bit 1 (High) = 0). The second bit determines the state
Forced operation
active "OFF"
(bit 0 (Low) = 0) or
Forced operation active "ON"
(bit 0 (Low) = 1).
State
Bit 1
Bit 0
Value
Inactive
0
0
0
Inactive
0
1
1
Active "OFF"
1
0
2
Active "ON"
1
1
3
Tab. 25: Forced operation states
Control values and the state of the outputs can be defined in the device-specific parameters → parame-
ter
12.2.23
Cyclical monitoring
The reception of a telegram on a group object can be monitored using the cyclical monitoring. If a tele-
gram is not received on the group object within a parameterizable time (monitoring cycle), the sending
device may be faulty or the bus cable to the sending device may be interrupted. The reaction to the loss
of a telegram can be set in the application-specific parameters for the device.
After the receipt of a telegram, ETS download or bus voltage recovery, the monitoring cycle is restarted.
Note
The monitoring cycle in the device should be at least quadruple the cyclical sending time of the send-
ing device. As a result, the reactions set will not be triggered immediately if a signal is missing, e.g.
due to high bus load.
Product manual | EN-US | VC/S 4.x.1 | 2CDC508220D0211 Rev. B
193
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