KEYENCE CB-EP100 - Manual (Page 29)

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- EtherNet/IP Network Unit CB-EP100 User’s Manual (LJ-V7000 Edition) -
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Cyclic communication
This section describes the cyclic communication functions and how to use them.
„ What is cyclic communication?
Cyclic communication is a function that exchanges data with the EtherNet/IP device
in a cyclic manner (at a set cycle).
In cyclic communication, data can be exchanged when one device successfully
opens a logical communication line called a "connection" with the other device.
The side which opens the connection is called the scanner, and the side to be
opened is called the adaptor. (The CB-EP100 is an adaptor.)
Cyclic communication is started in the following procedures:
(1) The scanner requests the adaptor to open the connection.
(2) The adaptor side checks compatibility.
(3) If no error occurs as a result the compatibility check, the adaptor opens the
connection.
(* If an error is found during the compatibility check, the adaptor does not open
the connection.)
"Checking the Device Compatibility" (Page 3-27)
Data is exchanged between the EtherNet/IP scanner, CB-EP100 and each
measuring instrument as follows:
To carry out EtherNet/IP communication with a scanner which does not
support cyclic communication (Rockwell Automation MicroLogix Series,
etc.), use "Message Communication" (Page 3-28).
(1) Request connection open
(3) Open connection
(2) Check
compatibility
Output data
Data reflected in the
scanner
Input data
The data output from the
scanner is stored by the
CB-EP100.
EtherNet/IP scanner CB-EP100 Measuring instrument
IN area
OUT area
Cyclic
communication Data in
measuring
instrument is
refreshed
Cyclic
communication
Data in
measuring
instrument is
refreshed
Reference