Yaskawa DeviceNet Option Card CM059 - Manual (Page 68)

68
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 data rate. Refer to the following dropline
budget when determining the number and length of droplines.
Baud Rate
Drop Length
Maximum Cumulative
125 kbaud
6 meters (20 ft)
156 meters (512 feet)
250 kbaud 78 meters (256 feet)
500 kbaud 39 meters (128 feet)
0
20
40
60
80
10
0 100 200 300 400 500
125
kbaud 250
kbaud
500
kbaud
Length of
Thin Cable
(meters)
Length of Thick Cable (meters)
At 125 kbaud: L
thick
+ (5.0 x L
thin
) = 500
At 250 kbaud: L
thick
+ (2.5 x L
thin
) = 250
At 500 kbaud: L
thick
+ L
thin
= 100
(where L
thick
is the length of thick cable and L
thin
is the length of thin cable.)
Fig. 9 Maximum Cable Distance