
B-64044EN/01 CONNECTION 1.CONNECTING THE DeviceNet
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1.2 CABLE LENGTH AND TRANSFER RATE
The maximum network length, branch length, and total branch length
are restricted by the network configuration. These lengths are
limited by the transfer rate.
■Maximum network length
The maximum network length is the distance between two nodes that
are most distant from one another or the distance between the
terminators, whichever is longer.
Node
Node
Node
Branch
length
Power supply for
communication
Node
Terminator
erminator
Branch
length
T-branch tap
T-branch tap
The network maximum length is one of
these, whichever is longer.
As shown below, the maximum cable length varies with the type of a
cable.
Cable type Maximum network length
Thick-wire cable (five wires) 500 m
Thin-wire cable (five wires) 100 m
NOTE
When the maximum network length is 100 m or
less, a thin-wire cable can be used as a main line.
In this case, prevent the limit values from being
exceeded while keeping the maximum current
capacity of the cable in mind.
The maximum network length is also restricted by
the communication rate.
Communication
rate
Maximum network
length when using
only thick-wire cables
Maximum network length
when using only
thin-wire cables
500 K bit/sec 100m
250 K bit/sec 250m
125 K bit/sec 500m
100m