4 Connectors
4.5.3 DeviceNet Network Configuration Restrictions
4-20
4
Communications Line Length Calculation Example
An example of calculating the maximum network length, drop line length, and total drop
line length is given below for the following DeviceNet network.
Maximum Network Length
The line length between two nodes that are farthest apart is 48 m. The line length between
the terminating resistors is 40 m. The maximum network length is thus 48 m.
Drop Line Length
There are four branches from the trunk line. The drop line length is given in the above dia-
gram for each. The longest drop line length is 6 m.
Total Drop Line Length
The total length of all drop lines is 41 m.
Connection of the Terminating Resistors
Be sure to connect the Terminating Resistors at both ends of the trunk line to reduce signal
reflection and stabilize communications.
• When there is a T-branch Tap 6 m or less from the end of the trunk line (or the node):
A Terminating Resistor attached to a T-branch Tap can easily be mounted without taking
up much space.
• When there is not a T-branch Tap 6 m or less from the end of the trunk line (or the node):
Use one of the following methods.
• Connect a T-branch Tap to which a Terminating Resistor has been mounted.
• Connect a Terminal-block Terminating Resistor.
Trunk line
10 m
2 m
3 m
6 m
6 m
6 m
6 m
1 m
2 m
1 m
2 m
Drop line length
Drop line length
3 m
1 m
2 m
2 m
5 m
6 m
6 m
Trunk line
10 m
Trunk line
20 m
Drop line length
Drop line length
Node
Node
Node
Node
Node
Node
Node
Node
Node
Node
Node
With
terminating
resistor
With
terminating
resistor
Summary of Contents for OMNUC W R88A-NCW152-DRT
Page 1: ...Cat No I538 E3 1 DeviceNet Option Unit OMNUC W Series Model R88A NCW152 DRT...
Page 53: ...4 Connectors 4 5 3 DeviceNet Network Configuration Restrictions 4 22 4...
Page 97: ...5 Parameter Settings 5 3 8 Notch Signal Output Positioning 5 44 5...
Page 211: ...8 Servo Driver Settings 8 5 3 Absolute Encoder Multi turn Limit Setting 8 24 8...
Page 257: ...9 Troubleshooting 9 46 9...