ABB i-bus EIB Product Manual page 142

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ABB i-bus EIB / KNX
© 2006 ABB STOTZ-KONTAKT GmbH
Commissioning
Type
Options: 1 bit /
1 byte unsigned /
1 byte signed /
2 byte unsigned /
2 byte signed /
2 byte floating point
The type denotes which type of value is assigned to the trigger of a group
(functional group) i.e. whether the group is triggered e.g. by a telegram with
the binary value 1 or a telegram with the 1-byte value 128.
A group can be activated by a telegram with the group address of a group
trigger of this group. Different types of values can be sent with a telegram
e.g. 1-bit value i.e. binary values such as 0 and 1 or e.g. 1-byte values such
as 0, 128 or 255, which can then be interpreted as 0%, 50% and 100%.
Trigger
The limits within which the values must lie to trigger the group are defined
under Trigger for Range A and Range B. In the case of the 1-bit type, there
are only the states 0 and 1. These values cannot be edited.
If a group is triggered by a group trigger, specific functions are activated e.g.
switching the light on or off. The light can thereby be switched on in specific
rooms e.g. by triggering a group with the value "0" and switched on in these
rooms by triggering a group with the value "1". A group can therefore behave
in a different way when triggered by the value "0" than by the value "1".
You could therefore also designate the triggering of a group by the value "1"
as the activation of the group (functional group) and the triggering of the
group by the value "0" as the deactivation of the group (functional group).
Binary values which trigger a group (functional group) can only adopt the
values "0" and "1". If the group is triggered e.g. by a 1-byte value, the
triggered values can lie in a range between 0...255 or between 0%...100%.
Value ranges can therefore be entered for the activation of a group and for
the deactivation of a group.
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