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1. Introduction
1.2 DeviceNet
Overview of DeviceNet
DeviceNet is a fieldbus network that provides easy interconnection between control devices
(PLC, PC, sensor, actuator, etc.).
DeviceNet was developed by Allen-Bradley as an open communication standard to connect
various field devices (sensor, actuator, robot controller, etc.). Because of the open
communication standard, DeviceNet users can easily construct a multi-vendor system with
various devices developed around the world.
Controller
Motor Driver
from Company A
Motor Driver
from Company B
Intelligent I/O
from Company C
Intelligent I/O
from Company D
Photo Sensor
from Company E
Analog Device
from Company G
HMI Device
from Company F
DeviceNet Network
Features of DeviceNet
Reduced Wiring
Compared with parallel wiring, DeviceNet employs a dedicated 5-wire cable (signal wires
and power wires) which substantially reduces the number of necessary wires, wiring time and
cost.
Detachable communication connectors provide you with simple wiring between nodes and
easy network separation or reconstruction.
Specified environment-resistance cables allow you to construct an environment-resistant
system at low cost.
Open Standard (Multi-vendor)
Due to an open communication standard, various devices from many manufacturers are
available. Standardized communication connectors provide you with easy network
construction.
The maintenance spare parts stored on site (factory, etc.) can be reduced because different
manufacturers’ devices are used in case of a breakdown. Similar products are available
around the world due to a global standard DeviceNet.
Large Numbers of Inputs/Outputs
For EPSON RC+ standard I/O and expansion I/O, the number of inputs/outputs is limited to
512 inputs and 512 outputs. When configuring a device to be a master of fieldbus I/O, you
can control more than 16,000 total inputs and outputs.
For a slave device, 2,040 inputs (255 bytes) and 2,040 outputs (255 bytes) are available.
2 Fieldbus I/O Rev.6