Precautions For Connecting Devicenet Communications Cables - YASKAWA SGD7S Product Manual

4.7 DeviceNet System Configuration

4.7.3 Precautions for Connecting DeviceNet Communications Cables

Branching from a Drop Line
There are three methods that you can use to branch from a drop line.
Drop
line
4.7.3 Precautions for Connecting DeviceNet Communications
Cables
Observe the following precautions when you connect the DeviceNet communications cables.
Maximum Network Length
The maximum network length is either the length of the line between the two nodes located the
farthest from each other or the length of the line between the terminating resistance on the
ends of the trunk line, whichever is longer.
T (with terminating resistance) T
Node
DeviceNet communications cables are available as either thick cables or thin cables. The fol-
lowing table lists the characteristics of each type of cable.
Communications distance
4-42
One Branch Line
Drop
line
T-branch
adapter
Drop line
SERVOPACK
The longer distance is the maximum network length.
Node Node
Node
Item
Signal decay
Flexibility Rigid (difficult to bend)
The Maximum of Three Branch Lines
Drop
line
T-branch
adapter
SERVOPACK SERVOPACK
T
Node
T
Node
T
T
Node
Cable Type
Thick Cable
Small
Long
Pliable (bends easily)
Connecting Nodes
Drop
line
Multi-drop connection
Drop
line
SERVOPACK
Drop line
SERVOPACK
Terminating resistance
Node
: Trunk line
: Drop line
: T-branch adapter
Thin Cable
Large
Short
Directly
Drop
line