Devicenet Network Construction - Epson EM07ZS1647F User Manual

2. Installation

2.2 DeviceNet Network Construction

Network Configuration
A 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 the node: 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 master) on your network.
Trunk Line and Drop Line
A trunk line is a backbone cable of DeviceNet network with a terminating resistor on the both
ends.
A drop line is a branch of the trunk line.
Terminating
resistor
For DeviceNet, 5-wire cables are used for trunk lines and drop lines. The DeviceNet cables
on the market can be used for such cables. There are two types of the DeviceNet cable: 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/).
12
Communications
Ground to
power supply
100 Ω or less.
Trunk Line
Trunk Line
T-branch
Tap
Drop Line
Node
Drop Line
Node
Use DeviceNet cables.
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
These are all 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
Connector with
terminating
Drop
Drop
resistor
Line
Line
Waterproof Waterproof
slave slave
Fieldbus I/O Rev.6