CJ1W-SCU31-V1 Serial Communications Unit 2x RS-422A/485 | Omron

The Original New Omron CJ1W-SCU31-V1 is a CPU Bus Unit for SYSMAC CJ-series PLCs that provides two independent RS-422A/485 serial communication ports for connecting external devices such as HMIs, barcode readers, serial printers, weigh scales, and third‑party instrumentation. Each port can be independently configured for a wide range of protocols including Protocol Macro, Host Link, NT Link (1:N mode), Serial Gateway, No‑protocol, and Modbus‑RTU Slave (Unit Ver. 1.3 or later). The Simple Backup Function allows Protocol Macro data to be backed up to the CPU Unit‘s Memory Card for simplified maintenance and system recovery.

Core Engineering Highlights:
2 x RS-422A/485 serial ports | 230.4 kbps max baud rate| Protocol Macro, Host Link, NT Link, Serial Gateway, No-protocol, Modbus-RTU Slave support| 380 mA current consumption @ 5V DC| 31 mm width| 500 m max transmission distance | Simple Backup Function support

Key Features:

• Original New Omron CJ1W-SCU31-V1 module

• Two RS-422A/485 serial ports for flexible serial connectivity

• Supports Protocol Macro for user‑defined communication sequences

• Host Link (C‑mode and FINS commands) for connection to host computers and HMIs

• NT Link (1:N mode) for direct connection to Omron programmable terminals

• Serial Gateway for CompoWay/F and Modbus‑RTU/ASCII protocol conversion

• No‑protocol mode for user‑defined data formats (ASCII/binary)

• Modbus‑RTU slave mode (Unit Ver. 1.3 or later)

• Transmission speeds up to 115.2 kbps (230.4 kbps maximum)

• Simple Backup Function for Protocol Macro data backup to Memory Card

• LED status indicators for communication and module status

• Switchable termination resistor (TERM switch) and 2‑wire/4‑wire selection (WIRE switch) for RS-422A/485

• 31 mm width for space‑saving installation

• 500 m max transmission distance (RS-422A/485)

• 9‑pin D‑sub male connector

Applications:

• Serial connection to HMIs, SCADA systems, and host computers

• Integration of barcode readers, serial printers, and weigh scales

• Data exchange with third‑party devices (inverters, temperature controllers, drives)

• Modbus‑RTU networking with sensors, meters, and actuators

• Custom protocol communication via Protocol Macro

• Legacy system upgrades and spare part replacement for CJ‑series configurations

Technical Specifications:

System Compatibility:

• Compatible with Omron SYSMAC CJ-series CPU units (CJ1, CJ2)

• Compatible with NJ-series Machine Automation Controllers

• Compatible with CP1H systems (requires CP1W-EXT01 CJ Unit adapter)

• Installs on CJ-series CPU Rack or Expansion Rack via CJ I/O Bus

• Supports external interrupt tasks (mounting position restrictions apply)

• Configuration performed in CX‑Programmer (I/O Table and Unit Setup)

• Supports Simple Backup Function with CJ1‑H and CJ1M CPU Units

Related Products:

• CJ1W-SCU41-V1 – 1 x RS-232C + 1 x RS-422A/485 ports

• CJ1W-SCU21-V1 – 2 x RS-232C ports

• CJ1W-SCU22 – 2 x RS-232C ports, high-speed type

• CJ1W-SCU32 – 2 x RS-422A/485 ports, high-speed type

• CJ1W-SCU42 – 1 x RS-232C + 1 x RS-422A/485, high-speed type

• CJ1W-CIF11 – RS-422A/485 adapter for serial port expansion

• CJ1W-PA205R – Power supply unit for CJ‑series CPU rack

• CX-One – FA Integrated Tool Package (includes CX‑Programmer)

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Omron, SYSMAC, and CJ-series are trademarks of Omron Corporation.