ABB i-bus KNX Product Manual - page 52
ABB i-bus
KNX
Planning and Application
50 2CDC 508 101 D0201 | VAA/S x.230.2.1
4.5
Bus voltage failure
The device can no longer be controlled at a bus voltage failure. The outputs switch off and the valve drives
assume their position in a no-current state (open or closed). Manual operation is not possible during a bus
voltage failure.
4.6
Reaction at bus voltage recovery, download and reset
Behaviour
At bus voltage recovery
At download (DL)
At reset
Output control
Parameterizable preferred
position at bus voltage
recovery is set
Control with the
communication object value
before download
Off
Monitoring control
value
Monitoring time will be
restarted
Monitoring time will be
restarted. Communication
object value unchanged
Monitoring time will be
restarted. Communication
object value is reset
Forced operation
Active, provided that forced
operation was also active
before bus voltage failure
Inactive, communication
object value is reset
Inactive, communication
object value is reset
Block
Inactive, communication object
value is reset
Inactive, communication
object value is reset
Inactive, communication
object value is reset
Valve purge
Valve purge is inactive.
Communication object value
Status valve purge
= 0.
Injection cycle time restarts
(provided that automatic valve
purging is activated)
Valve purge is inactive.
Communication object value
Status valve purge
= 0.
Injection cycle time restarts
(provided that automatic
valve purging is activated)
Valve purge is inactive.
Communication object value
Status valve purge
= 0.
Injection cycle time restarts
(provided that automatic
valve purging is activated)
Manual operation
Can be parameterized
Can be parameterized
Can be parameterized
4.7
Priorities
The priorities for telegram processing are defined as follows:
1. Overload/short circuit current
2. Bus voltage failure/recovery
3. Manual
operation
4. Block
5. Forced
operation
6. Valve
purge
7. Control value after control fault
8. Control values (1 bit/byte)
Note
1 corresponds to the highest priority.