Behaviour After A Device Restart - Gira 5142 00 Product Documentation

4.2.4.3.5 Behaviour after a device restart

The different indication and operating functions of the controller extension are controlled via
different communication objects as described in the previous chapters. A main controller must
transmit the current status to the extensions, i.e. updating the communication objects so that,
after a programming operation or after the return of bus voltage, all the status information is
available for the initialisation of the extension. This takes place automatically for some objects
during the initialisation of the main controller.
To ensure that all the objects are initialised correctly, some communication objects of the
controller extension can also initialise automatically after a device restart as an option. For this,
the parameter "Value request from controller extension?" the parameter node "Room
temperature control" can be set to "Yes". The update takes place after a reset by means of a
ValueRead telegram to the room temperature controller. This must answer the request with a
ValueResponse telegram. If the extension does not receive all or some of the answers, the
affected objects are initialised with "0". In this case, after a reset the objects must first be
actively rewritten by the bus by other bus subscribers, e.g. through automatic transmission by
the main controller. This is also always the case when the parameter "Value request from
controller extension?" is configured to "No".
The automatic update takes place for all the transmitting objects with the name "B.Controller
extension" and for the objects "D.Input controller extension".
i The automatic update can take place with a delay after a device reset. If there are still other
bus devices besides the push button sensor transmitting telegrams immediately after a
reset, it may be useful to activate the transmit delay for in order to reduce the bus load
(see page 79).
i During commissioning, all extensions should be put into operation first. Only then should
the main controller be connected and programmed. For larger KNX/EIB installations where
the extensions are sometimes distributed over several lines, the remaining lines should
also be initialized after a reset of one line.
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Software "Push button sensor 3 plus"
Functional description
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