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-11-
No.EX##-OME0015-C
○
DeviceNet
TM
Media Topology
A shielded twisted pair cable for DeviceNet
TM
should be used.
The maximum cable length depends on the communication speed and the cable type used.
<Communication speed [kbps] and maximum bus cable length>
Max. cable length for network
Communication speed
Thick cable
Thin cable
Drop line length
Cummulative Drop
500 kbps
100 m
100 m
39 m max.
250 kbps
250 m
100 m
78 m max.
125 kbps
500 m
100 m
6 m or less
156 m max.
○
Terminating resistors
DeviceNet
TM
requires a terminating resistor to be installed at each end of the trunk.
The resistor requirements are:
•
121
Ω
•
1% metal film
•
1/4 watt
Terminating resistors should not be installed at the end of a drop line, only at the two ends of trunk line.