Toshiba DeviceNet nv Series, Instruction Manual, Page: 45 / 159

3.6 Network power and ground
Unified Controller nv Series DeviceNet Module DN611B Instruction Manual
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3.6.2
Network configuration method
 Important
- When attaching a node to a drop line, consider not only the current capacity of the trunk line but also the current
capacity of the drop line.
- Especially when connecting nodes in daisy chain on drop lines, be careful the insufficiency of current capacity.
- Use a network power supply with a current capacity that is sufficiently larger than the total current consumption
required for the network.
This section describes the selection of power supply devices and the arrangement of power supply devices
and power supply devices selection for supplying network power to each DeviceNet node.
(1) Maximum current of DeviceNet cable
The DeviceNet network power supply is rated 24VDC.
The current that can be passed through the network cable is as follows.
Trunk line using thick cable: Maximum 8A
Cable length [m] 0 25 50 100 150 200 250 300 350 400 450 500
Max. current [A] 8.00 8.00 5.42 2.93 2.01 1.53 1.23 1.03 0.89 0.78 0.69 0.63
Figure 3-5 Trunk current (when thick cable is used)
Maximum current of thick cable
Cable length [m]
M
ax
im
u
m
c
urr
en
t
[A
]
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
0 50 100 150 200 250 300 350 400 450 500