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Overview Section 6-1
6-1 Overview
Message communications enable messages to be set between nodes on a
DeviceNet network when required by system conditions. The messages can
be sent between PCs, between an OMRON PC and a master made by
another company, or between slaves. They can be used to send/receive data;
read time data, error histories, and other data; or control operation, e.g., by
force-setting/resetting bits.
There are two types of messages: FINS messages and explicit messages.
6-1-1 Outline of Message Communications
Item FINS messages Explicit messages
Outline Message communications for
OMRON products that use the
FINS protocol.
General-purpose message com-
munications using the DeviceNet
protocol.
Remote
device
OMRON PCs (with a CS/CJ-series
DeviceNet Unit)
Other manufacturer masters or
slaves.
OMRON PCs with C200H or
CVM1/CV-series DeviceNet Master
Unit or CS/CJ-series DeviceNet
Units
OMRON PCs with C200H I/O Link
Units
Features Provide a greater range of services
than explicit messages by sending
and receiving FINS commands.
Have message compatibility with
other OMRON networks, such as
Controller Link, SYSMAC LINK,
and Ethernet (up to 3 levels)
Enable message communications
with DeviceNet devices from other
manufacturers.
Can receive explicit messages
from OMRON PCs with C200H- or
CVM1/CV-series DeviceNet Master
Units and can send explicit mes-
sages to OMRON PCs with C200H
I/O Link Units
Message communications functions
FINS communications function
Explicit message
communications function
Send
Receive
Send
Receive