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8
Intro
duc
tion
E3X-DRT21-S
User’s Manual
Introduction
Editor’s Note
Editor’s Note
Page Format
Section 4
APPENDIX
82
82
E3X-DRT21-S
E3X-DRT21-S
User's Manual
User's Manual
Section 4
Section 4
DeviceNet Connection Settings
DeviceNet Connection Settings
DeviceNet Connection Settings
DeviceNet Connection Settings
Setting Connections without using Configurator
Setting Connections without using Configurator
Connection
Poll
Bit-Strobe
COS
(Change of
state)
Cyclic
Used for basic I/O.
Description
DeviceNet supports different protocols for remote I/O communications between master
and slave devices. Connection is a unit used to manage those protocols. The
connections can be set using the configurator.
The DeviceNet remote I/O communications protocol supports four types of
connections: Poll, Bit-Strobe, COS (Change of state), and Cyclic.
The features of these connections are listed in the following table. The Sensor
communication unit supports all the protocols.
Used for input of 8 bytes or less.
Sends broadcasting requests from master
and receives input from slaves.
Communications timing is determined by regular cycles
(heartbeat timer).
The communication unit will send data at a regular cycle.
This connection can be used to send data to the master
from the
communication unit only when the data changes.
Transmission timing is determined by a heartbeat timer.
Data can be sent only when required, thereby reducing
the communications load on the network.
COS and Cyclic
connections
cannot be used
at the same time.
Poll and Bit-Strobe
connections
cannot be used
at the same time.
To use COS and Cyclic connections, the DeviceNet master must support those functions.
Confirm that the master supports COS and Cyclic connections before using them.
OMRON products, such as the CS1W-DRM21 and CJ1W-DRM21, support COS and Cyclic
The connections used for all the IN data of the Sensor communication unit are as
follows:
Data of 8 bytes or less : Bit-Strobe
Data of more than 8 bytes : Poll
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