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1. Overview of the DeviceNet Module
1.1 Features and System Configuration Examples of the DeviceNet Module (DN211)
This section describes the features and system configuration examples of the DeviceNet module
(DN211) for the programmable controller PROSEC-T2 series (T2/T2E/T2N). The DN211 is an
interface module for connecting the DeviceNet, which is a device level network for FA, to the
PROSEC-T2 series.
Hereafter, the programmable controllers PROSEC T2, PROSEC-T2E, and PROSEC-T2N are
respectively called the "T2", "T2E", and "T2N". Likewise, the DeviceNet module for the T2 series
is also called the "DN211."
(1) Conformed with DeviceNet
DeviceNet is a standardized device level network for factory automation(FA), developed by
RockWell Automation Co. in USA. A nonprofit organization, called ODVA (Open DeviceNet
Vendor Association), is serving as the center for the maintenance/extension of the DeviceNet
specification and for conformable products introduction.
The DN211, functioning as the master (parent station) device on a DeviceNet, performs data
input/output between the master device and the DeviceNet slave (child station) devices, which are
developed by different makers (vendors) in and outside Japan and conform with the DeviceNet, to
interface such slave devices with the T2/T2E/T2N .
(2) Input/Output Data Size, Number of Slave Devices, communication Rate and Network
Length
A DN211 allows a DeviceNet to have one network to be connected. The sizes of inputting and
outputting data, allowed between a DN211 and slave devices are 128 words for input and 128
words for output (one word = 16 points).
Input data and output data, so far as each of them is within 128 words in total, can be exchanged
data with up to 63 slave devices. (Since the amount of data outputted to a slave device and the
amount of data inputted from a slave device vary depending on the slave device, check the slave
device specification of data size).
The definition of input data and output data, dealt in this book, is shown in the following figures.
Output data : T2/T2E/T2N → DN211 → Slave device
Input data : T2/T2E/T2N ← DN211 ← Slave device
Figure 1.1 Definition of Output Data and Input Data
Three types of communication rates, namely 500 kbps, 250 kbps and 125 kbps are available. The
maximum network length varies depending on the communication rate (l00 m for 500 kbps, 250 m
for 250 kbps, and 500 m for 125 kbps).
The detail is explained in "1.2 Network Configuration of DeviceNet."