Yaskawa DeviceNet Option Card CM05x - Manual (Page 26)

DeviceNet Network Wiring 4-3
DeviceNet allows the use of either thick or thin cable to be used to construct trunklines. DeviceNet also allows a
combination of both types of cable to be used on the same network. To determine the maximum cable distance
with a mix of both thick and thin cable, use Figure 4-2.
At 125 KBaud:
L
thick
+ 5.0 x L
thin
= 500 meters
At 250 KBaud:
L
thick
+ 2.5 x L
thin
= 250 meters
At 500 KBaud:
L
thick
+ L
thin
= 100 meters
(where
L
thick is the length of thick cable and
L
thin is the length of thin cable – in meters.)
Figure 4.2 Maximum Cable Distance
Dropline length is the longest cable distance measured from the tap on the trunkline to each of the transceivers of
the nodes on the dropline. The total amount of dropline allowable on the network depends upon the baud rate.
Refer to the following dropline budget when determining the number and length of droplines.
Drop Length
Baud Rate
Maximum Cumulative
125 KBaud 156 meters (512 feet)
250 KBaud 78 meters (256 feet)
500 KBaud
6 meters (20 ft)
39 meters (128 feet)
0
20
40
60
80
100
0 100 200 300 400 500
125
KBaud 250
KBaud
500
KBaud
Length of
Thin Cable
(meters)
Length of Thick Cable (meters)