ABB i-bus KNX ABA/S 1.2.1 Product Manual page 39

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ABB i-bus KNX
Parameters
Description of parameters
Initial value:
Initial value of the input. May only be used in combination with the Set initial value after restart parameter.
Set initial value after restart:
If the checkbox is selected for this parameter, the input will have the defined initial value on restart. If it is
not, the device first tries to restore the input value.
If the restore is successful the input will use this value and will not trigger a recalculation.
If the restore is unsuccessful, the input value is initially undefined. Only a subsequent valid telegram will
update it.
There will be a restart after a download, on supply voltage recovery or on bus voltage recovery.
Read value from bus:
If the checkbox is selected for this parameter the "READ ON INIT" flag in the object sends one "Value
Read" command to the bus on restart or after a download.
If this parameter is enabled, the logic engine waits for the calculation until all inputs of a logical link have
a valid value. Elements without a direct or indirect link are not calculated.
Function
Whenever a telegram is received the input starts a recalculation independently if the value has changed.
Bus voltage failure, download and restart
The input values are saved. On restart the input reacts as per the corresponding parameter.
Note
ABA/S 1.2.1 | 2CDC509086D0201 39