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1.2 Network Configuration of DeviceNet
This section describes the network configuration of the DeviceNet.
1.2.1 The Network Configuration
The network configuration of a DeviceNet consists of a trunk line and drop lines as shown in Figure
1.3.
(1) The Nodes
The nodes of the DeviceNet in Figure 1.3 have slave devices such as input/output devices, sensors,
and drive units, and a master device such as the DN211, to exchange data with each other. One
network can have up to 64 nodes and one master device. Physical arrangement of a master device
and slave devices has no particular restrictions.
Each of the DeviceNet devices on a network has a unique number (NA: node address) to identify
the node from the other nodes. The node address values must be within 0 to 63 in decimal scale,
and the node addresses in the network must be different from the others.
(2) The Trunk Line
According to the DeviceNet specification, a trunk line is a cable which connects nodes located
most distant. The trunk line can have nodes directly-connected with it (connection with no drop
line). The length of the trunk line varies depending on the communication rate of the network. The
both ends of the trunk line need a terminal resistor.
(3) The Drop Line
All the cables branched from taps on the trunk line fall on drop lines. The drop line has a maximum
length of 6 meters (from tap to most distant node) regardless of the communication rate on the
network (The total extension of drop lines varies depending on the communication rate on the
network). A drop line can have one or more nodes connected. The following three types of node
configurations are available, as shown in Figure 1.3.
a) Configuration of drop lines short from the tap/multiport tap
b) Configuration of multidrops on a drop line
c) Configuration of branches on a drop line (no branch configuration for the trunk line)
Node 45
Node 5
Node 0
Node 60
Node 55
Node 50
Node 40
Node 30
Node 35
Node
25
Node
20
Node
15
Node
10
Tap
Terminal
resistor
Tap
Multiport tap
Branch configuration
Short drop line configuration
No drop line
Multidrop
configuration
Terminal
resistor
Tap Multiport tap
Trunk line
Drop line
Figure 1.3 Example of DeviceNet Network Configuration