Devicenet Network Construction - Epson RC620 Manual

2. Installation

2.1.2 DeviceNet Network Construction

Network Configuration
DeviceNet network is configured as shown in the following figure.
Attach a terminating
resistor on each end
of the trunk line.
Trunk Line
T - branch
Tap
Drop
Drop Line Drop
Line
Line
Node
Node
Node
There are two types of nodes: master and slave. The master controls a network and
gathers data from its slaves. The slaves, including external I/O and other devices, output
data in response to the master's output order and informs the master of its input status.
You can install masters anywhere in the network. You can connect up to 64 nodes
(including the server) in the network.
Trunk Line and Drop Line
Trunk line is a backbone cable of DeviceNet network with terminating resistors on the
both ends.
Drop line is a branch of the trunk line.
For DeviceNet, 5-wire cables are used for trunk lines and drop lines. Commercially
available DeviceNet cables can be used. There are two types of DeviceNet cables: Thick
cable and Thin cable. Environment-resistant cable and flexible cable are available. For
details of cables, see ODVA's Web site (http://www.odva.org/).
14
Communications
Ground to
100 Ω or less.
power supply
Trunk Line
Trunk Line
T - branch
Tap
Drop Line
Node
Drop Line
Node
Use DeviceNet cables.
Terminating
resistor
Trunk Line
T-branch
Power Supply Tap or
T - branch Tap
24 V DC
T - branch
Trunk
Connector
Line
T - branch Tap
Drop Line
T - branch Tap
Node
Drop Line
Node
Node
Terminating
resistor
Drop Lines.
- No limits on the number of T-branch
- Limits on the length of drop lines
Attach a terminating
resistor on each end of
the trunk line.
T - branch
Trunk
Connector
Line
Drop
Drop
Line
Line
Waterproof Waterproof
slave
RC620 Option Fieldbus I/O Rev.8
Connector with
terminating
resistor
slave