ABB i-bus KNX Product Manual page 43


ABB i-bus KNX
Start-up
Sending and switching delay after bus
voltage recovery in s [2...255]
Options:
During the sending and switching delay, telegrams are only received. The telegrams are not processed,
however, and the outputs remain unchanged. No telegrams are sent via the bus.
After the sending and switching delay, telegrams are sent and the state of the outputs is set to correspond
with the parameterization or the communication object values.
If communication objects are read out via the bus during the sending and switching delay, e.g. by a
visualization system, these read requests are stored, and a response is sent, after the sending and
switching delay has been completed.
An initialization time of about two seconds is included in the delay time. The initialization time is the time
that the processor requires to be ready to function.
Send object "In operation"
Options:
The communication object In operation indicates the presence of the device on the bus. This cyclic
telegram can be monitored by an external device. If a telegram is not received, the device may be
defective or the bus cable to the transmitting device may be interrupted.

No: The communication object In operation is not enabled.

Yes: The communication object In operation and the following parameters are enabled:
Time delay in s [1...15]
Options: 1...15
This parameter determines the time delay used by the outputs when they switch successively. The
set time delay applies for all outputs or connected drives of the actuator.
Caution
The parameterized time delay also applies for automatic control, weather alarms and forced
operations. Therefore, the time delay should only be used in large systems if a mains voltage
failure is to be expected when all the drives start-up simultaneously.
2...255
How does the device react on bus voltage recovery?
After bus voltage recovery, the device always waits for the transmission delay time to elapse before
sending telegrams via the bus. The parameterized positions are moved to immediately after bus
voltage recovery. Incoming telegrams are updated during the switching delay. The most recently
received telegram of the highest priority is executed. Manual operation can be executed
immediately.
No
Yes
JRA/S | 2CDC 506 051 D0204 41