KNX Topology a 10-Minute Course

- KNX systems can be installed at required places and can consist of several KNX subsystems.

- It follows a tree topology.

  • Nodes (N) are assigned to a line (L)
  • Several lines are connected via a main line (ML) and form an area (A)
  • Several areas are connected with each other via the backbone line (BL)

- The basic unit of a KNX TP installation is a line which includes a KNX power supply (including choke), and usually no more than 64 other bus devices.

- Branches could be taken out on bus cable to extend more subsystems.

- No more than three repeaters can be operated in parallel in a line, meaning the maximum number of bus devices is 255.

- Line Couplers could be used to increase the network further, up to 15 lines can be operated via Line Couplers on a line.

Cable Length:

- Distance from power supply to device: max. 350 m

- Distance between any two devices in a line: max. 700 m

- Length of a line segment: max. 1,000 m

- Distance between two power supplies (including choke) in a line: as per manufacturers’ specifications.

Individual Address:

- Every device in a KNX system is assigned a unique, unambiguous number. This consists of three numbers separated by dots. The numbers depend on the position of the bus device in the topology:

- The first number denotes the number of the area

- The second number denotes the number of the line

- The third number is a sequential number indicating the device’s position in the line

Fig: Example of KNX topology incorporating all media (TP, PL, RF, IP)

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