beautypg.com

2 devicenet, Overview of devicenet, Features of devicenet – Epson EM07ZS1647F User Manual

Page 14

background image

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