Filter
Top Products
2. Installation
2.2 DeviceNet Network Construction
Network Configuration
A DeviceNet network is configured as shown in the following figure.
Communications
p
ower su
pp
l
y
Node
Node
Node
Node
Node
Node
Node
Use DeviceNet cables.
Ground to
100
Ω
or less.
T-branch Tap
Drop Line
Drop
Line
Waterproof
slave
T-branch
Connector
Connector with
terminating
resistor
Trunk Line
Power Supply Tap or
T-branch Tap
24 V DC
A
ttach a terminating
resistor on each end
of the trunk line.
Trunk Line
Trunk Line
Trunk
Line
Drop
Line
Drop Line
Drop Line
Drop Line
Drop Line
Drop
Line
Drop
Line
T-branch
Connector
Trunk
Line
T-branch
Tap
T-branch
Tap
Waterproof
slave
T-branch Tap
A
ttach a terminating
resistor on each end
of the trunk line.
Node
There are two types of the node: master and slave. The master controls a network and gathers
data from its slaves. The slaves, including external I/O and other devices, output data in
response to the master’s output order and informs the master of its input status.
You can install masters anywhere in the network. You can connect up to 64 nodes (including
the master) on your network.
Trunk Line and Drop Line
A trunk line is a backbone cable of DeviceNet network with a terminating resistor on the both
ends.
A drop line is a branch of the trunk line.
These are all drop Lines.
- No limits on the number of T-branch
- Limits on the length of drop lines
T-branch
Terminating
resisto
r
Trunk Line
Terminating
resisto
r
For DeviceNet, 5-wire cables are used for trunk lines and drop lines. The DeviceNet cables
on the market can be used for such cables. There are two types of the DeviceNet cable: Thick
cable and Thin cable. Environment-resistant cable and flexible cable are available. For
details of cables, see ODVA’s Web site (http://www.odva.org/).
12 Fieldbus I/O Rev.6