Omron SYSMAC CJ1W-SCU31-V1 User Manual

7
Protocol Overview Section 1-3
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.
1-3 Protocol Overview
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: For connections between host computers and PLCs
• Protocol macro: For communications between PLCs and general-purpose
external devices
• 1:N NT Link: For communications between PLCs and Programmable
Terminals (PTs)
• 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.
Note 1. A 4-wire connection must be used when using Host Link communications
for an RS-422A/485 connector.
PLC
Series
Product Model
number
Serial ports Serial communications mode
Host Link Protocol
macro
1:N NT Link
(See note 2.)
Loop-
back
test
Serial
Gate-
way
Serial
Gate-
way in
proto-
col
macro
mode
No-
proto-
col
(See
note
3.)
1:1
Host
Link
Mod-
bus-
RTU
slave
CS Serial
Communi-
cations
Boards
CS1W-
SCB21-V1
RS-232C OK OK OK OKOKOKOKOKOK
RS-232C OK OK OK OKOKOKOKOKOK
CS1W-
SCB41-V1
RS-232C OK OK OK OKOKOKOKOKOK
RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK
Serial
Communi-
cations Unit
CS1W-
SCU21-V1
RS-232C OK OK OK OKOKOKOKOKOK
RS-232C OK OK OK OKOKOKOKOKOK
CS1W-
SCU31-V1
RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK
RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK
CJ Serial
Communi-
cations Unit
CJ1W-
SCU21-V1
RS-232C OK OK OK OKOKOKOKOKOK
RS-232C OK OK OK OKOKOKOKOKOK
CJ1W-
SCU31-V1
RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK
RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK
CJ1W-
SCU41-V1
RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK
RS-232C OK OK OK OKOKOKOKOKOK
--- Device to be connected Host computer
or Programming
Device
General-
purpose
external
device
PT None Depends on the
protocol used at
the conversion
destination
Gen-
eral-
pur-
pose
exter-
nal
device
Host Link com-
puter
Supporting unit versions All unit versions Unit version 1.2 or later Unit version 1.3
or later

Omron SYSMAC CJ1W-SCU31-V1 Specifications

General

Brand	Omron
Model	SYSMAC CJ1W-SCU31-V1
Category	Network Hardware
Language	English