Omron CS1W-RPT01 Benutzerhandbuch

A message service is a command/response system used for data transmis-
sion between nodes on a network, i.e., PLC to PLC, PLC to computer, and
computer to PLC). The message service can also be used to control opera-
tions, such as mode changes. The message service is implemented by send-
ing commands from the user program. The following communications
instructions are used:

SEND and RECV: Instructions for sending and receiving data. 

CMND: An instruction for sending FINS commands. Some FINS commands
are supported by Controller Link Units, and other FINS commands supported
by the PLC’s CPU Unit.

Source 
node to 
destination 
node

PLC to PLC

PLC to 
computer

Computer 
to PLC

C200HX/HG/HE, 
CS/CJ-series, CVM1, 
CV-series, or 
CQM1H-series PLC

User program

A program is not required for receiving 
responses when the PLC executes 
SEND and RECV.

SEND

(Com-
mand for
CPU Unit)

C200HX/HG/HE, 
CS/CJ-series, CVM1, 
CV-series, or 
CQM1H-series PLC

(Com-
mand for
CPU Unit)

User program

A program is not required for receiving 
responses when the PLC executes 
commands.

CMND

(Com-
mand for
Controller 
Link Unit)

(Not supported by the 
C200HX/HG/HE.)

Command

Command

C200HX/HG/HE, 
CS/CJ-series, CVM1, 
CV-series, or 
CQM1H-series PLC

CS/CJ-series, CVM1, 
CV-series, or 
CQM1H-series PLC

C200HX/HG/HE,
CS/CJ-series, CVM1, 
CV-series, or CQM1H-
series PLC

Computer

A program is required for sending and 
receiving data with the computer.

A program is not required for receiving 
responses when the PLC executes commands.

 

Command

SEND

C200HX/HG/HE,
CS/CJ-series, CVM1, CV-series
or CQM1H-series PLC

(The equivalent of SEND/
RECV and CMND are sent 
from the computer pro
gram.)

Computer

Command

(Command for

Controller Link 

Unit or CPU 

Unit)

Programming is required to receive 
responses at the computer.