Yaskawa DeviceNet Option Card CM05x Manuel d'utilisateur télécharger pdf (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:

thick

+ 5.0 x L

thin

= 500 meters

At 250 KBaud:

thick

+ 2.5 x L

thin

= 250 meters

At 500 KBaud:

thick

+ L

thin

= 100 meters

(where

thick is the length of thick cable and

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)

100

0 100 200 300 400 500

125

KBaud

250

KBaud

500

KBaud

Length of

Thin Cable

(meters)

Length of Thick Cable (meters)

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 113 114

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Yaskawa DeviceNet Option Card CM05x Manuel d'utilisateur Page 26

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