10
Intro
duc
tion
E3NW-CRT
User’s Manual
Introduction
Reading This Manual
Reading This Manual
Page Format
50
Section 3
CompoN
et Communications Specifications
E3NW-CRT
User’s Manual
Section 3
Explicit Messa
g
e Communications
Explicit Messa
g
e Communications
You can read and write parameters for a specified Sensor Amplifier Unit by sending
CompoNet explicit messages from the master to the Sensor Communications Unit. The
Sensor Communications Unit processes the commands received from the master and
returns responses. CompoNet explicit messages can be used in both I/O Mode 1 and I/O
Mode 2.
Basic Format of Explicit Messa
g
es
The basic command and response formats are given below.
Command Format
Destination Node Address
With two hexadecimal bytes, specify the node address of the Unit to which to send the
explicit message (command).
Service Code, Class ID, Instance ID, and Attribute ID
These parameters specify the command code, processing target, and processing
details.
With this Sensor Communications Unit, specify the Sensor unit number of the Sensor
Amplifier Unit for which the command is intended as the Instance ID.
The specified numbers of bytes for the class ID, instance ID, and attribute ID depend on the master.
When a message is sent from an OMRON CompoNet Master Unit, specify the class ID and instance
ID in two bytes (four digits), and the attribute ID in one byte (two digits).
Write Data: This is not required for a read command.
Response Format
• Normal
• Error
Number of Received Bytes
The number of bytes of data received from the source node address is returned in
hexadecimal.
Source Network Address
The node address of the node that sent the command is returned in hexadecimal.
Destination network address
Service code
Class ID Instance ID
Service data
Attribute ID
(Write Data)
Number of received bytes
Source network address
Service code
Data
Number of received bytes
Source network address
Service code
Error code
Header
Overview of section
Lower-level header
Title of each section
Page tab
Supplementary Explanation
Helpful information regarding operation and reference pages are
introduced here using symbols.
Overview of
lower-level section
Explanation of options
Gives the section
number and title.
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