Connection Examples For Devicenet Communications Cable - YASKAWA SGD7S Product Manual

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.
T (with terminating resistance)
Node
Nodes
Trunk line and drop
lines
Connection
methods
Terminating
resistance
Communications
power supply
• 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
Important
Branching from the Trunk Line
There are three methods that you can use to branch from the trunk line.
One Branch Line
Trunk
line
T-branch
adapter
SERVOPACK
T
Node Node T
Node
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.
The cable with terminating resistance on each end is the trunk line. Any cable that
branches from the trunk line is a drop line.
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.
You must connect both ends of the trunk line to terminating resistance to decrease
signal reflection and ensure stable network communications.
You must provide power to the communications connector at each node from the
communications power supply with a communications cable for DeviceNet communi-
cations.
devices, such as a lightning arrester.
The Maximum of Three Branch Lines
Trunk
Trunk
line
line
Drop line
SERVOPACK

4.7.2 Connection Examples for DeviceNet Communications Cable

T
Node Node
Node
T
T
Node
Trunk
line
T-branch
adapter
SERVOPACK SERVOPACK
4.7 DeviceNet System Configuration
Terminating resistance
: Trunk line
: Drop line
: T-branch adapter
Connecting Nodes
Directly
Multi-drop connection
Trunk
line
SERVOPACK
Drop line
4
Trunk
line
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