
1.CONNECTING DeviceNet FUNCTIONS CONNECTION B-63404EN/03
- 74 -
1.3 CABLE LENGTH AND BAUD RATE
There are some restrictions in configuring a network: maximum
network length, branch length and total branch length. These factors
are also restricted by the baud rate.
Maximum network length
The "maximum network length" refers to whichever is longer, the
distance between furthermost nodes or the distance between
terminators.
The following table shows the maximum network length according to
cable type.
Cable Type Maximum Network Length
Thick cable (5-wire) 500m
Thin cable (5-wire) 100m
NOTE
Thin cable can also be used as the trunk if the
maximum network length is within 100 m. In this
case, also pay attention to the maximum current
capacity of the cable so that this limit value is not
exceeded.
The maximum network length is also limited by the baud rate.
Baud Rate
Maximum Network Length
When Only Thick Cable Is
Used
Maximum Network Length
When Only Thin Cable Is
Used
500 K bit/sec 100m
250 K bit/sec 250m 100m
125 K bit/sec 500m
Node
Node
Node
Branch length
Node
Terminator
Terminator
Branch
length
T-branch tap
T-branch tap
Whichever of these is longer is the maximum
network length.
Communications
power supply