Data Sheet for Product

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Building Technologies Data sheet KNX bus CE1N3127en

HVAC Products 18.02.2008

Installation notes

Local regulations on insulation against mains voltage (SELV as per EN 60730)

apply if the bus cable is laid in parallel to lines of a three-phase network

(3 x AC 400 V).

Permissible bus topologies are: Tree, line, and star topologies. These topologies can

be mixed as needed. However, ring topologies are not allowed.

The tree topology is advantageous if a large KNX network must be created.

Tree topology (with stub lines) Line topology (with loops)

N2 N2

N1 N3 N4 N1 N4

N7 N3

KNX TP1KNX TP1

3127Z02

N1…N7 Bus devices

CE+

CE-

CE+

CE-

CE+ CE-

Device with

screw terminals

T-branch with

bus terminal

Device with

spring cage terminals

3127Z06en

CE+ CE- CE-CE+

N1 N2 N5 N6

N7N3

N4 N8

CE+ CE-

N1…N8 Bus devices

Lay bus cables

Bus topologies

dvantage:

Tree topology

Branching and

connection variants