Yaskawa CM012 DeviceNet Option Card - Manual (Page 68)

Cable Specification 5-3
Cable Length
‹
Trunk Line
The maximum allowed trunk line length depends on the type of cable used and the network baud rate. The total cable length includes the
length of the trunk and the sum of all the drop lines.
For trunk lines of mixed thick and thin cables, the total length at the various baud rates:
o 125 kbaud: L
thick
+ (5 x L
thin
) = 500 m
o 250 kbaud: L
thick
+ (2.5 x L
thin
) = 250 m
o 500 kbaud: L
thick
+ L
thin
= 100 m
‹
Drop Line
The drop line is measured from the tap on the trunk line to the transceiver of the DeviceNet node. Note that the total cable length includes the
length of the trunk and the sum of all the drop lines.
Table 5.3 – Trunk Line Cable Length
Baud Rate Thick Cable Thin Cable
125 kbaud 500 m
100 m 250 kbaud 250 m
500 kbaud 100 m
Table 5.4 – Drop Line Cable Length
Baud Rate Maximum @ Each Maximum Total
125 kbaud
6 m
156 m
250 kbaud 78 m
500 kbaud 39 m