Omron CJ1W-EIP21 用户手册

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.

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

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-EIP

• CJ2M-CPU3

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Message communications functions

FINS communications function

Explicit message 
communications function

Send

Receive

Send

Receive