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Overview Section 7-1
7-1 Overview
The message communications functions send command/response messages
between nodes on the Ethernet network. The messages can be sent between
a computer and PLC, between two PLCs, between an OMRON PLC and a
master made by another company, or between slaves. The messages can be
used to send/receive data; read time data, error logs, and other data; or con-
trol operation, e.g., by force-setting/resetting bits.
There are two types of messages: FINS messages and explicit messages.
Item FINS messages Explicit messages
Outline Message communications for
OMRON products that use the
FINS protocol.
Standard ODVA message communi-
cations using the CIP protocol.
Remote
device •Computer with an Ethernet inter-
face
•OMRON PLCs (with a CS/CJ-
series EtherNet/IP Unit, built-in
EtherNet/IP port, or Ethernet
Unit)
•Computer with an Ethernet inter-
face
•Another company’s masters or
slaves.
•OMRON PLCs (with a CS/CJ-
series EtherNet/IP Unit or built-in
EtherNet/IP port)
Features •Send and receive the various
FINS commands to provide an
even greater range of services
than the CIP UCMM messages.
•Provide transparency in mes-
sage communications with other
OMRON networks, such as Con-
troller Link, SYSMAC LINK, and
Ethernet.
(CS1/CJ1 CPU Units with unit
version 2.0 or later or CJ2 CPU
Units: Up to 8 levels, CPU Units
with unit version earlier than 2.0:
Up to 3 levels)
•Supports message communica-
tions with other companies’ Ether-
Net/IP devices.
CS/CJ Series
•CS1W-EIP21
•CJ1W-EIP21
•CJ2H-CPU@@-EIP
•CJ2M-CPU3@
Message communications functions
FINS communications function
Explicit message
communications function
Send
Receive
Send
Receive