4-3
Section
Connecting to the DeviceNet Network
48
2. Use crimp terminals for wiring. Connecting bare twisted wires can cause the
cables to come OFF, break, or short circuit, most likely resulting in incorrect
operation and possibly damage to the Units.
3. Use suitable crimp tools and crimping methods when attaching crimp termi-
nals. Consult the manufacturer of the tools and terminals you are using. In-
appropriate tools or methods can result in broken wires.
4. Be extremely careful to wire all signal lines, power lines, and shielding wire
correctly.
5. Tighten all set screws firmly. Tighten to a torque of between 0.25 and
0.3 N
m.
6. Wire the signal lines, power lines, and shielding wire so that they do not be-
come disconnected during communications.
7. Do not pull on communications cables with excessive force.
8. Allow leeway so that communications cables do not have to be bent further
than natural. The Cables may become disconnected or wires may break if
the cables are bent too far.
9. Never place heavy objects on communications cables.
10. Double-check all wiring before turning ON the power supply.
4-3-3 Connecting Communications Cables to T-branch Taps
This section shows how to connect a communications cable with a connector
attached to a T-branch Tap. When using a DeviceNet Interface Unit, we recom-
mend wiring with a T-branch Tap rather than the multi-drop method because it
allows for easier maintenance.
There are two kinds of T-branch Taps, one makes a single branch and the other
makes three branches, but the cable connections are the same for both.
The connectors indicated by asterisks in the following diagrams have the least
resistance and these connectors should be used for the trunk line connections.
When using a T-branch Tap on a drop line, we recommend connecting the long-
est drop line to these connectors.
DCN1-1C (1 branch)
* Use for trunk line of
longest drop line.
DCN1-3C (3 branches)
* Use for trunk line of
longest drop line.
The required number of connectors is included with the T-branch Taps shown
above. The following table describes the included connectors.
