Epson RC620 Manual page 25

Thick Cable
Shield Wire
Communications Cable Signal
Signal wire
Power wire
Shield wire
Terminating Resistor
To reduce reflections of communication signal, terminating resistors should be attached on
both ends of the trunk line. For DeviceNet, nodes have no terminating resistor on the ends.
Attach 121 Ω +/-1%, 1/4W terminating resistors between the signal wires (CAN-H and
CAN-L) of the trunk line cable.
connectors can accept terminating resistors. Molded terminating resistors with connectors
are also available to attach to environment-resistant T-branch taps and connectors.
Node Connection
Nodes can be connected to a DeviceNet network by the following topologies: tree, multi-
drop, T-branch, daisy chain. For tree topology, there is no limitation of daisy chain layer
but drop line length is limited. For details of drop line length, refer to the following
section Drop Line Length.
Terminating
Resistor
RC620 Option Fieldbus I/O Rev.8
11.2 to 12.1 mm outside diameter
Braid Shield
Signal Wire
(Blue/White)
Power Wire
(Red/Black)
Wire Type Color
Blue
White
Red
Black
-
Trunk Line
Tree
Thin Cable
Shield Wire
Details of Signal
Signal
Signal
Communications Power Positive
Communications Power Negative
Shield
Some commercially available T-branch taps and
Multi-drop T-branch
2. Installation
6.9 mm outside diameter
Braid Shield
Signal Wire
(Blue/White)
Power Wire
(Red/Black)
Wire Identity
Low CAN L
High CAN H
V+
V−
S
Terminating
Branch Tap
Resistor
Daisy Chain
15