YASKAWA SGDV-OCA05A

4.7 DeviceNet System Configuration
4.7.3 Precautions for Connecting DeviceNet Communications Cables
4
Wiring and Connections
4-43
The maximum network length is determined by the type of cable, as shown in the following
table.
Drop Line Lengths
The drop line length is the length of the line from the branch point from the trunk line to the far-
thest node on the drop line.
The maximum drop line length is 6 m. A drop line can be branched out into other drop lines.
Total Drop Line Length
The total drop line length is the total length of all of the drop lines.
 Length Limit
The total drop line length must be within the allowable range, and each drop line must be 6 m
or less.
The following table shows the total drop line length, which depends on the baud rate.
Baud Rate (Kbps)
Maximum Network Length (Unit: m)
Thick Cable Thin Cable
500 100 100
250 250 100
125 500 100
You can use both thick cables and thin cables to connect different nodes in the same net-
work. The maximum network length will be shorter than when only thick cables are used.
The cable lengths must meet the following restrictions.
Baud Rate
(kbps)
Total Drop Line Length
500 39 m max.
250 78 m max.
125 156 m max.
Information
Note: L
THICK
: Length of thick cable
L
THIN
: Length of thin cable
Baud Rate (Kbps) Maximum Network Length
500
L
THICK
+ L
THIN
≤ 100 m
250
L
THICK
+ 2.5 × L
THIN
≤ 250 m
125
L
THICK
+ 5.0 × L
THIN
≤ 500 m