Omron SYSMAC CJ1W-SCU21-V1, Operation Manual

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Selecting the Serial Communications Mode Section 1-8
1-8 Selecting the Serial Communications Mode
Serial Communications Mode
Reference
•
Host computer Communicating
using an OMRON
protocol
Host Link
Host computer (Host computer:PLC
= 1:1 or 1:N)
C-mode commands
or FINS commands
Command
interpretation
by PLC
Command sent
to host computer
(Host computer:PLC
= 1:1) FINS
commands
Creating
communications
frame for a host
computer protocol
Protocol macro
Standard system
protocol
Use a standard
system protocol.
User-created
protocol
Use the CX-Protocol to
change a standard
system protocol.
PLC
•
OMRON
component
Protocol macro
Protocol macro
•
Communications
Commands Reference
Manual (W342)
•
Section 4 Using Host
Link Communications
•
Section 5 Using
Protocol Macros
•
CX-Protocol Operation
Manual (W344)
•
Section 5 Using
Protocol Macros
•
Appendices B to O
•
Section 5 Using
Protocol Macros
•
CX-Protocol Operation
Manual (W344)
Connect Device
Execute using PMCR instruction.
Execute using CMND instruction.
Through network
Execute using CMND instruction.
Through network
Serial Gateway
Serial Gateway
Serial Gateway
Serial Gateway
Serial Gateway
•
OMRON PLC
CS/CJ Series or
CVM1/CV Series Serial Gateway
Serial Gateway Through network
1:1 Host Link
•
OMRON
component
CompoWay/
F-compatible
•
Modbus-com-
patible device
(including
OMRON
components)
Modbus-RTU-
compatible
•
Modbus-com-
patible device
(including
OMRON
components)
Modbus-ASCII-
compatible
Execute using CMND/SEND/RECV
instruction.
Execute using CMND instruction.
Through network
•
General-
purpose
external device
Protocol (including
no-protocol) used
mainly for stop-start
synchronous data
sending and reception Use the CX-Protocol to
create a new protocol.
Protocol macro
•
Section 5 Using
Protocol Macros
•
CX-Protocol Operation
Manual (W344)
No-protocol
•
Reusing host
computer
programs for
existing PLC
•
Reusing host computer programs for 1:1 Host Link
created using C200H/C1000H/C2000H PLCs
•
Reusing host computer programs for Host Link created
using CVM1-series PLCs
Used with Host Link compatible
device selection function (Select
C mode or D mode)
Host Link compatible device
selection function (Select B mode)
•
General-
purpose
external device
Sending/receiving
data in a single
direction from/to a
device such as a bar
code reader or printer
User-created protocol
using ladder program
Modbus-RTU
Slave
Modbus-RTU
commands
sent from host
Section 9 Using Modbus-
RTU Slave Mode
(Unit Version 1.3 or later)