YASKAWA SGDV-OCA05A

4.7 DeviceNet System Configuration
4.7.2 Connection Examples for DeviceNet Communications Cable
4
Wiring and Connections
4-41
4.7.2 Connection Examples for DeviceNet Communications
Cable
The following diagram shows an example of the connections between the host controller and
the DeviceNet communications connector (CN6) on the SERVOPACK.
Branching from the Trunk Line
There are three methods that you can use to branch from the trunk line.
Nodes
A node is either a slave that connects to a SERVOPACK, a similar device, or the mas-
ter that manages the slaves. No restrictions are placed on the locations of the master
or slaves. Any node can be the master or a slave.
Trunk line and drop
lines
The cable with terminating resistance on each end is the trunk line. Any cable that
branches from the trunk line is a drop line.
Connection
methods
A node is connected with one of two methods: a T-branch connection or a multi-drop
connection. With a T-branch connection, a T-branch adapter is used to connect the
node. With a multi-drop connection, a node is connected directly to the trunk line or a
drop line.
Both T-branch and multi-drop connections can be used together in the same network.
Ter mi n a ti n g
resistance
You must connect both ends of the trunk line to terminating resistance to decrease
signal reflection and ensure stable network communications.
Communications
power supply
You must provide power to the communications connector at each node from the
communications power supply with a communications cable for DeviceNet communi-
cations.
• The communications cable must be an ODVA-Compliant DeviceNet communications cable.
• Both ends of the trunk line must be connected to terminating resistance.
• Only DeviceNet devices can be connected to the network. Do not connect any other
devices, such as a lightning arrester.
One Branch Line The Maximum of Three Branch Lines
Connecting Nodes
Directly
Node Node Node
Node Node
Node
Node Node
T (with terminating resistance)
TT
T
T
T
Terminating resistance
: Trunk line
: Drop line
: T-branch adapter
Important
Trunk
line
Trunk
line
T-branch
adapter
SERVOPACK
Drop line
SERVOPACK SERVOPACK SERVOPACK
Trunk
line
Trunk
line
T-branch
adapter
Drop line
Multi-drop connection
T
runk
line
Trunk
line
SERVOPACK