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ABB i-bus
®
KNX
Planning and application
Note
A description of the functions is provided in the i-bus
Note
•
•
The Unicast type of communication cannot be used when the device is operated in KNX Secure mode. If
Unicast is selected when KNX Secure mode is active, the ETS switches to Multicast. The Unicast
parameterization in the application will be ignored in this case.
KNX Secure mode must be switched off in the ETS in order to be able to use the Unicast type of
communication.
4.1.3
Monitoring an IPR/S 3.5.1
An active tunneling connection should be monitored via a "CONNECTIONSTATE_REQUEST", but this is
also possible via T-Connect.
Monitoring a device via T-Connect can have drawbacks, e.g. in case of monitoring, programming or
scanning processes in the line.
4.1.4
System broadcast
All IP devices that are to communicate with each other in a KNX system must use the same multicast
address. The address 224.0.23.12 port 3671 is used by default; see Multicast.
Changing the multicast address in a system could lead to problems during commissioning. If the multicast
address of the closest Router is changed first, for example, it will switch to the new multicast address after
programming. It will then no longer be able to access the rest of the system, and the remaining Routers in
the system can no longer be programmed.
ETS can then reach these devices via the "system broadcast address." The system broadcast address can
be used to change the multicast address of all KNX IP devices, as well as the backbone key. This will work
only if the device is not operated in KNX Secure mode or if the backbone key is known to the ETS.
Routing of system broadcast telegrams can be set via the parameter Route/Block broadcast telegrams. In
other words, this parameter is effective for (standard) broadcast telegrams and system broadcast
telegrams.
If unicast is used as the type of communication, it must be ensured that the IP address of the
Router does not change during operation. For this purpose, either a static IP address should be
assigned or a corresponding setting should be made for the DHCP server.
With the ETS, all IP parameters are also updated when the physical address is changed. In other
words, even if only the option Programming physical address is selected in the ETS, the device
name, the multicast address, the type of IP communication (DHCP, AutoIP, fixed), the IP address,
the subnet mask, the default gateway and all tunneling addresses are loaded again. If the IP
address changes in the process, unicast configuration with the i-bus
®
Tool online help.
®
Tool must be repeated.
IPR/S 3.5.1 | 2CDC502099D0211 Rev. A 37
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