Protocol Overview - Omron SYSMAC CS1W-SCB41-V1 Operation Manual

Protocol Overview

1-3 Protocol Overview
PLC Product Model
Series number
CS Serial CS1W-
Communi- SCB21-V1
cations
Boards
CS1W-
SCB41-V1
Serial CS1W-
Communi- SCU21-V1
cations Unit
CS1W-
SCU31-V1
CJ Serial CJ1W-
Communi- SCU21-V1
cations Unit
CJ1W-
SCU31-V1
CJ1W-
SCU41-V1
--- Device to be connected
Supporting unit versions
Note *The CS-series Serial Communications Boards/Units without the "-V1" suffix
do not support this Simple Backup Function, but the CJ1W-SCU21/41 does
support this function even though the model number lacks the "-V1" suffix.
A Serial Communications Board is an Inner Board for CS-series CPU Units
that provides RS-232C and/or RS-422A/485 serial ports. An Inner Board is an
option and is installed in the CPU Unit.
A Serial Communications Unit is a CPU Bus Unit that provides two RS-232C
serial ports or one RS-232C and one RS-422A/485 port. The following eight
serial communications modes can be used as required for each serial port.
• Host Link:
• Protocol macro: For communications between PLCs and general-purpose
• 1:N NT Link:
• Loopback test: For testing the communications ports
• Serial Gateway
• No-protocol
• 1:1 Host Link
• Modbus-RTU slave mode
Note (1) The Serial Gateway can also be executed in protocol macro mode.
(2) Modbus-ASCII mode is not supported.
Serial ports
Host Link
RS-232C OK
RS-232C OK
RS-232C OK
RS-422A/485 OK (See note 1.) OK
RS-232C OK
RS-232C OK
RS-422A/485 OK (See note 1.) OK
RS-422A/485 OK (See note 1.) OK
RS-232C OK
RS-232C OK
RS-422A/485 OK (See note 1.) OK
RS-422A/485 OK (See note 1.) OK
RS-422A/485 OK (See note 1.) OK
RS-232C OK
Host computer
or Programming
Device
All unit versions
Note 1. A 4-wire connection must be used when using Host Link communications
for an RS-422A/485 connector.
For connections between host computers and PLCs
external devices
For communications between PLCs and Programmable
Terminals (PTs)
Serial communications mode
Protocol 1:N NT Link Loop-
macro (See note 2.) back
test
OK OK OK
OK OK OK
OK OK OK
OK OK
OK OK OK
OK OK OK
OK OK
OK OK
OK OK OK
OK OK OK
OK OK
OK OK
OK OK
OK OK OK
General- PT None
purpose
external
device
Section 1-3
Serial Serial No- 1:1
Gate- Gate- proto- Host
way way in col Link
proto- (See
col note
macro 3.)
mode
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
OK OK OK OK
Depends on the Gen- Host Link com-
protocol used at eral- puter
the conversion pur-
destination pose
exter-
nal
device
Unit version 1.2 or later Unit version 1.3
or later
Mod-
bus-
RTU
slave
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
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