ABB i-bus
®
KNX
Commissioning
© 2008 ABB STOTZ-KONTAKT GmbH
64
Contact position on bus voltage failure
Options:
opened
closed
unchanged
The output can adopt a defined state on bus voltage failure using this
parameter.
•
opened:
The contact is opened with bus voltage failure.
•
closed:
The contact is closed with bus voltage failure.
•
unchanged:
No change of the contact position.
Note
The reaction on bus voltage failure, recovery and download is to be
monitored.
Object value "Switch" on
bus voltage recovery
Options: not
write
write with 0
write with 1
With this parameter the output can be influenced by the value of the
Switch
communication object on bus voltage recovery.
The
Switch
communication object can be written with either a 0 or 1 when
the bus voltage recovers.
The contact position is redefined and set in dependence on the set device
parameterisation.
•
not write:
The communication object assumes the value 0. This value
remains as it is until modified via the bus. The contact position is only
re-evaluated at this time.
Note
The reaction on bus voltage failure, recovery and download is to be
monitored.
The Room Master draws the energy for switching the contact from the
bus. After bus voltage is applied, sufficient energy is only available after
about ten seconds in order to switch all contacts simultaneously.
Depending on the set transmission and switching delay after recovery of
bus voltage set in the parameter window
General
, the individual outputs
will only assume the desired contact position after this time.
If a shorter time is set, the RM/S will only switch the first contact when
sufficient energy is stored in the Room Master, in order to ensure that
enough energy is available to immediately bring all outputs safely to the
required position with a renewed bus voltage failure
