Devicenet network topology, Maximum cable distance – Yaskawa DeviceNet Option Card CM05x User Manual

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DeviceNet Network Wiring 4-2

DeviceNet Network Topology

The DeviceNet media has a linear bus topology. Terminating resistors are required on each end of the trunkline.
Droplines as long as 6 meters (20 feet) each are permitted, allowing one or more nodes to be attached.
DeviceNet allows branching structures only on the dropline. Figure 4.1 shows an example DeviceNet network.
The thick lines in Figure 4.1 indicate a trunkline. The thin lines in Figure 4.1 indicate a dropline.

Figure 4.1 DeviceNet Topology

Maximum Cable Distance

The total amount of trunkline allowable on the network depends upon the baud rate and the type of cable (thick or
thin) used. The cable distance between any two points in the cable system must not exceed the Maximum Cable
Distance allowed for the baud rate. For trunklines constructed of only one type of cable, refer to the following
table to determine the Maximum Cable Distance based on the baud rate and the type of cable used. Cable
distance between two points includes both trunkline cable and dropline cable length that exists between the two
points.

Baud Rate

Maximum Cable Distance for

100% Thick Cable

Maximum Cable Distance for

100% Thin Cable

125 KBaud

500 meters (1640 feet)

250 KBaud

250 meters (820 feet)

500 KBaud

100 meters (328 feet)

Zero Length

Dropline

Node

Tap

Multi-Port

Tap

Node

Multi-Port

Tap

Node

Terminating
Resistor

Multiple Node

Daisy Chain

Dropline

Multiple Node

Branching

Dropline