Omron DEVICENET -, Operation Manual

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32
Network Configuration Section 2-2
Terminating Resistors
(Terminators)
Use the methods shown below to connect the Terminating Resistors to the
trunk line. Refer to
2-4-8 Connecting the Terminating Resistors (Terminators)
for wiring details.
Note 1. Connect a Terminating Resistor to the Tap when there is a T-branch Tap or
Power Supply Tap at the end of the trunk line.
2. The Terminal-block Terminating Resistor method can be used when a
node is connected at the end of the trunk line with the multi-drop connec-
tion method.
3. Use this method when there is an Environment-resistive Slave at the end
of the trunk line.
4. Use this method when using Flat Cable.
Ground
Use any one of the methods shown below to ground the network by connect-
ing the cable’s shielding to an acceptable ground (100
Ω
or less.) Ground the
network at one point only.
Refer to 2-4-9 Grounding the Network for wiring details.
2-2 Network Configuration
2-2-1 Compatible Cables
Cable Requirements Always use DeviceNet cables that meet all DeviceNet specifications. The Net-
work may not operate properly if other cable is used.
Refer to the home page of the ODVA for information on DeviceNet cables
other than the ones listed above.
Connecting to a T-branch
Tap or Power Supply Tap
(See note 1.)
Connecting to a
Terminal Block
(See note 2.)
Connecting to a
T-branch Connector
(See note 3.)
Connecting a Terminating
Resistor to a Flat Connector
Socket (See note 4.)
T-branch
Tap
Trunk
line
Trunk
line
Terminating
Resistor
Terminating
Resistor
T-branch
Tap
DRS1-1 Terminal-block
Terminating Resistor
Node
Trunk
line
Shielded
T-branch
Connector
Connector
with
terminator
(DRS2-1,
DRS2-2, or
DRS3-1)
Branch
line
Terminating
Resistor
(DCN4-TM4)
Trunk
line
Flat Connector
Socket
(DCN4-TR4-1)
Grounding a Power
Supply Tap
Grounding a Connector
of a T-branch Tap or Node
Grounding an Unused
T-branch Tap Connector
S
V
− −
+
S
V
−
V+
−
+
24 VDC
24 VDC
Trunk
line
Trunk
line
T-branch
Tap
Node
Open connector
Cable type OMRON model number
Thick Cable DCA2-5C10
Thin Cable DCA1-5C10
Flat Cable DCA4-4F10