88
Fieldbus Communication
WAGO-I/O-SYSTEM 750
750-306 DeviceNet
TM
Fieldbus Coupler
Manual
Version 2.0.0
10.1.1.3 Topology
To build a simple DeviceNet
TM
network, you need a scanner (PC with
DeviceNet
TM
fieldbus PCB card), a connection cable and a 24 VDC power supply
unit in addition to a DeviceNet
TM
fieldbus node.
The DeviceNet
TM
network is set up as a line structure (trunk line) with
terminating resistors (121 Ohm).
Figure 45: DeviceNet
TM
Network – Line Structure (Trunk Line) with Terminating Resistors
In systems with more than two stations, all nodes are wired in parallel. The nodes
are connected to the fieldbus cable (trunk line) by drop lines. This requires the bus
cable to be looped through without disruption. The maximum length of a line
branch should not exceed 6 m.
An example of this topology is shown in the following figure:
Figure 46: DeviceNet
TM
Network with Cable Branches