Omron CS1W-RPT01 Manuale Utente
166
Introduction
Section 6-1
6-1
Introduction
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:
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.
are supported by Controller Link Units, and other FINS commands supported
by the PLC’s CPU Unit.
Message service
SEND/RECV instructions
CMND instruction (FINS commands)
Source
node to
destination
node
node to
destination
node
PLC to PLC
PLC to
computer
computer
Computer
to PLC
to PLC
C200HX/HG/HE,
CS/CJ-series, CVM1,
CV-series, or
CQM1H-series PLC
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.
responses when the PLC executes
SEND and RECV.
SEND
(Com-
mand for
CPU Unit)
mand for
CPU Unit)
C200HX/HG/HE,
CS/CJ-series, CVM1,
CV-series, or
CQM1H-series PLC
CS/CJ-series, CVM1,
CV-series, or
CQM1H-series PLC
(Com-
mand for
CPU Unit)
mand for
CPU Unit)
User program
A program is not required for receiving
responses when the PLC executes
commands.
responses when the PLC executes
commands.
CMND
(Com-
mand for
Controller
Link Unit)
mand for
Controller
Link Unit)
(Not supported by the
C200HX/HG/HE.)
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
CS/CJ-series, CVM1,
CV-series, or
CQM1H-series PLC
CV-series, or
CQM1H-series PLC
C200HX/HG/HE,
CS/CJ-series, CVM1,
CV-series, or CQM1H-
series PLC
CS/CJ-series, CVM1,
CV-series, or CQM1H-
series PLC
Computer
A program is required for sending and
receiving data with the computer.
receiving data with the computer.
A program is not required for receiving
responses when the PLC executes commands.
responses when the PLC executes commands.
Command
SEND
C200HX/HG/HE,
CS/CJ-series, CVM1, CV-series
or CQM1H-series PLC
CS/CJ-series, CVM1, CV-series
or CQM1H-series PLC
(The equivalent of SEND/
RECV and CMND are sent
from the computer pro
gram.)
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.
responses at the computer.