00772425 datasheet(14/42 Pages) BURKERT

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Type büS

Getting to know the büS topologies

GETTING TO KNOW THE BÜS TOPOLOGIES

5.1

What is a bus topology and why do you need it?

The arrangement of different devices on the bus defines the topology. Different topologies influence the

quality of communication and certain topologies are, therefore, recommended to achieve a good network

design.

5.2

Common terms of bus topology

5.2.1

Trunk line

A trunk line is the main part of a CANopen cabling solution. All devices and junction boxes are connected to

it.

5.2.2

Stub line

A stub line is a branch of the trunk line and allows connection to a device that is not located close to the

trunk line. The use of stub lines must be avoided as much as possible. However, there are several limita-

tions depending on the baud rate of the network.

5.2.3

Overview of cable lengths

Overview of maximum cable lengths in the CANopen specification:

Baud rate

max. trunk length

max. stub line length

max. length all stubs

50 kbit/s

1000 m

50 m

250 m

125 kbit/s

500 m

20 m

100 m

250 kbit/s

250 m

10 m

50 m

500 kbit/s

100 m

5 m

25 m

1 Mbit/s

20 m

1 m

5 m

Tab. 5: Cable lengths

This table shows an overview of theoretical values for an ideal network. Nevertheless, there are more de-

pendencies regarding the trunk line length, the stub line length, the amount of process data and the baud

rate.

5.2.4

Example

Trunk

Stub

Device 3

Device 2

Device 4

Device 5

Device 6

Device n

Junction box

Device 1

Fig. 8: Example

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