Precautions For Connecting Devicenet Communications Cables - YASKAWA SGD7S Product Manual

Branching from a Drop Line
There are three methods that you can use to branch from a drop line.
One Branch Line
Drop
line
T-branch
adapter
SERVOPACK
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.
Item
Signal decay
Communications distance
Flexibility

4.7.3 Precautions for Connecting DeviceNet Communications Cables

The Maximum of Three Branch Lines
Drop
Drop
line
line
Drop line
SERVOPACK
The longer distance is the maximum network length.
T
Node Node T
T
Node
Thick Cable
Small
Long
Rigid (difficult to bend)
Drop
line
T-branch
adapter
SERVOPACK SERVOPACK
Terminating resistance
Node Node
Node
: Trunk line
: Drop line
T
: T-branch adapter
Node
Cable Type
Thin Cable
Large
Short
Pliable (bends easily)
4.7 DeviceNet System Configuration
Connecting Nodes
Directly
Multi-drop connection
Drop
line
SERVOPACK
Drop line
Drop
line
4
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