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2. Installation
Total Drop Line Length
The total drop line length is the total distance of all drop lines on one network.
Trunk Line
2 m
2 m
1 m
1 m
3 m
4 m
4 m
Terminating
Resistor
Terminating
Resistor
In the figure above, the total drop line length is 17 m.
The maximum total drop line length is restricted by baud rate as shown in the table below.
The cable thickness is not related to the restriction.
Baud Rate Max. Total Drop Line Length
500 kbps
250 kbps
125 kbps
39 m
78 m
156 m
Cable Current Capacity
The current-carrying capacity of the DeviceNet network cable is restricted as shown below:
Trunk Line
Thick Cable Thin Cable
Drop Line (Unit: A)
Current Capacity 8A 3A 4.57 / Drop Line Length (m) ≤ 3A
The following figures illustrate power supply configuration examples.
When an external power supply is installed on the network as shown in the figure below, the
current capacity is 11A and it exceeds the permissible current of the cable.
Trunk Line
1A
Power Supply Tap
External Power
Supply 24 V DC
1A
1A
2A2A
2A
2A
Terminating
Resistor
Terminating
Resistor
If the location of the external power supply is changed on the network as shown in the figure
below, the power supply can be used on the network because the current capacity on the left
side of the power supply tap is 5 A and that on the right side is 6 A.
Trunk Line
1A
Power Supply Tap
1A
1A
2A2A
2A
Terminating
Resistor
External
Power Supply
24 V DC
2A
Terminating
Resistor
Fieldbus I/O Rev.6 15