6 Message Communications
6-2
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
6-1 Overview
Message communications enable messages to be set between nodes on a DeviceNet network when
required by system conditions. It is possible for messages to be sent between a PLC and a DeviceNet
master or slave made by another company. You can use them to send/receive data; read time data,
error logs, and other data; or control operation, e.g., refreshing with user-specified values.
There is one type of messages: Explicit messages.
z Overall Structure
Additional Information
If only the message communications function is being used and the remote I/O communications
function is not being used, message communications are possible even if the master function is
disabled. In this case, it is not necessary to register a scan list.
6-1-1 Outline of Message Communications
Explicit message communications
Overview General-purpose message communications that uses DeviceNet protocol
Remote
devices
• DeviceNet masters and slaves from other companies
• C200H-series DeviceNet Units, CVM1/CV-series DeviceNet Units, and CS/CJ-series DeviceNet
Units
Features • Message communications with DeviceNet devices from other companies can be performed.
• Explicit messages from OMRON PLCs (with C200H-series DeviceNet Units and CVM1/
CV-series DeviceNet Units) can be received. Explicit messages can be sent to OMRON PLCs
(with C200H I/O Link Units).
Message communications functions
Explicit message
communications function
Send
Receive
NJ-Series CPU Unit
DeviceNet Unit
SendCmd
instruction
(2801 Hex)
2801 Explicit message
Explicit
message
function
DeviceNet network
Explicit message
DeviceNet message communications
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