Omron DEVICENET -, Operation Manual

Page: 97 / 163

76
Wiring Methods Section 2-4
2-4-6 Connecting Shielded (Environment-resistive) Cables
Check that the connector (plug or socket) on the Shielded T-branch Connector
or Environment-resistive Slave is the opposite of the connector (socket or
plug) on the Cable, align the connectors, and insert the cable connector.
Insert the connector fully and tighten the connector by hand. Tighten Micro-
size Connectors to a torque of between 0.39 and 0.49 N
⋅
m. Tighten Mini-size
Connectors to a torque of between 0.7 and 0.8 N
⋅
m.
Note (1) Tighten the connector ring securely by hand. If the connector is not tight-
ened sufficiently, it will not provide the specified level of environmental re-
sistance and might become loose due to vibration.
Do not use a tool such as pliers to tighten the connector, because the tool
can damage the connector.
(2) To avoid damaging the cable or breaking wires, leave some slack in the
cable so that it won’t be pulled too hard or bent too sharply when connect-
ing. Also, never put heavy objects on top of the cable.
(3) The location of the connector and the type of connector (plug or socket)
varies from device to device. Check the location and type of connector re-
quired before wiring the devices.
2-4-7 Wiring the Communications Power Supply
There are three ways to wire the communications power supply. The following
table shows applications where each method can be used.
Note (1) The maximum current is 5 A for a T-branch Tap and 8 A for a T-branch
Connector (3 A through a micro-size connector). Determine the current
consumption for all nodes in both directions.
(2) A DCN2-1 T-branch Connector (for thin cable only) cannot be used be-
cause the maximum current is 3 A. Also, when using a DC3-12 T-branch
Connector that can connect to thin cable and thick cable, do not exceed
3 A through the thin cable.
Method Number of com-
munications
power supplies
in Network
Total current
consumption
(See note 1.)
Connection
method
1 2 or
more
Less
than
3 A
3 A to
5 A
More
than
5 A
Connecting to a
T-branch Tap Yes No Yes Yes No Attach V+ and V
−
wires to a connector.
Connecting to a
T-branch Con-
nector Yes No Yes Yes
(See
note 2.) Yes
(See
note 2.) Use just the V+ and
V
−
from a thin cable
with shielded con-
nector on one end.
Connecting to a
Power Supply
Tap Yes Yes Yes Yes Yes Wire V+ and V
−
wires to terminal
block.