Devicenet Network Configurations; Devicenet Network Configuration; Network Configuration; Trunk Line / Drop Line And Maximum Cable Length - Toshiba nv Series Instruction Manual

1.3 DeviceNet Network Configuration

Network Configuration

1.3.1
The DeviceNet network configuration is a trunk line – drop line configuration as shown in Figure 1.1.
(1) Node
The nodes in Figure 1.1 include slave devices such as input / output devices, sensors, and drive devices, and
master devices such as the DN912 that exchange data with slave devices. 64 nodes can be connected to one
network. The physical layout of the master device / slave device is not particularly limited.
For the DeviceNet device on the network, set the number (node address: NA) used to identify it with other
nodes. The range of the node address value is a decimal number from 0 to 63, and the node address of a
device connected to one network must be different.
(2) Trunk line
In the DeviceNet standard, the cable connecting the farthest nodes is called the trunk line. Nodes can be
directly connected on the trunk line (connection without drop line). The length of the trunk line depends on the
network speed. Terminating resistors are required at both ends of the trunk line.
(3) Drop line
All cables branching off from the trunk line tap are drop lines. The length of the drop line is up to 6m from the
tap to the terminal node, regardless of the network speed (the total length of the drop line depends on the
network speed). One or more nodes can be connected on the drop line. The configuration of the nodes on the
drop line can be the three configurations shown in Figure 1-1.
a) Short drop line configuration from tap or multiport tap
b) Multi-drop configuration on drop line
c) Branch configuration on drop line (branch configuration on trunk line is not possible)

Trunk line / Drop line and maximum cable length

1.3.2
The DeviceNet standard has provisions for thick cables and thin cables. See DeviceNet Volume I for details of
the standard. Currently, cables conforming to the thick cable and thin cable standards are commercially
available. Purchase them according to the network configuration (described in "C.1 Network Components").
(1) Trunk line
The DeviceNet trunk line consists of thick or thin cables (thick and thin cables can be mixed). Thin cables are
easier to lay because they are softer than thick cables. Conversely, a thick cable can have a longer network
length than a thin cable. The maximum length of the trunk line varies depending on the communication speed
of the network and the type of cable used. For details, see "(3) Maximum network length".
Unified Controller nv Series DeviceNet Module DN912 Instruction Manual
1.3 DeviceNet Network Configuration
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