DeviceNet • 107

Network Architecture

5.2 Network Architecture

5.2.1 Transmission Media

5.2.1.1 Type of Cable

A bus medium forms the basis for the physical realization of a network using DeviceNet.

According to the line specification, a double 2-conductor twisted pair cable (twisted pair, screened cable) is recommended to be used as a medium.

It consists of two screened twisted pair cables with a wire in the middle of the cable. Further screening extended at the outside.

The blue and the white twisted pair cable is used for signal transmission, the black and red one for the supply voltage.

5.2.1.2 Cable Types

The DeviceNet bus is configured using a remote bus cable as the trunk line and several drop lines.

For this purpose, the DeviceNet specification distinguishes between 2 cable types:

•Thick Cable

For the trunk line of maximum 8 A or for networks extending over more than 100 m.

The trunk line topology is linear, i.e. the remote bus cables are not further branched. On each end of the remote bus cable, terminating resistors are required.

•Thin Cable

For drop lines with maximum 3 A or for networks extending less than 100 m.

One or more nodes can be connected to the drop lines, in other words, branching is permitted here. The length of the individual drop lines is measured from the branching point of the node and can be up to 6 m. The entire length of the drop line depends on the Baud rate.

Note

If possible, route the data line separately from all high current carrying cables.

Further information

For a detailed specification regarding the cable types, please refer to the

INTERNET under: http://www.odva.org.

WAGO-I/O-SYSTEM 750

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