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CJ1W-SCU21-V1

Omron CJ1W-SCU21-V1 CJ Series Serial Communication Unit RS-232

SKU: CJ1W-SCU21-V1

Single-port RS-232C serial communication module for CJ1 PLC

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Product Overview

The Omron CJ1W-SCU21-V1 is a compact serial communication module for CJ1 series PLCs, providing reliable RS-232C connectivity for industrial automation systems requiring interface to serial devices. This module features one RS-232C port, enabling connection to devices such as HMI terminals, barcode scanners, weigh scales, variable frequency drives, and programming tools. The CJ1W-SCU21-V1 supports multiple protocols including Omron-specific protocols for connection to Omron devices, Modbus RTU for third-party device integration, and general ASCII communication for custom device interfaces. The module includes buffer memory for handling data exchange without impacting PLC scan time, ensuring reliable communication even at high baud rates. Configuration is easily achieved through CX-Programmer or the module front panel switches, allowing quick setup of communication parameters including baud rate, data bits, stop bits, and parity. The CJ1W-SCU21-V1 is hot-swappable, allowing module replacement without powering down the entire PLC system, minimizing downtime during maintenance. LED status indicators provide at-a-glance monitoring of communication activity and error conditions. Applications include connection to VFDs for motor speed control, barcode scanner integration for product tracking, serial HMI connections, and legacy equipment interface in modernization projects.

  • SKU: CJ1W-SCU21-V1
  • Series: CJ1

Best-Fit Applications

  • Variable frequency drive control
  • Barcode scanner integration
  • Serial HMI connections
  • Weigh scale communication
  • Legacy equipment interface
  • Serial printer output
  • Programming tool connection
  • Remote I/O communication

Buying Checklist

  • Simple serial connectivity
  • Modbus support for third-party devices
  • Hot-swappable for easy maintenance
  • LED diagnostics for troubleshooting
  • Compact space-saving design
  • Proven CJ1 compatibility
  • Easy configuration
  • Omron quality and support

Technical Specifications

Model CJ1W-SCU21-V1
Series CJ1
Ports 1x RS-232C
Baud Rate 300 to 115200 bps
Data Bits 7 or 8
Stop Bits 1 or 2
Parity None, Even, Odd
Protocols Omron, Modbus RTU, ASCII
Communication CJ1 backplane
Current Consumption 180mA at 5VDC
Weight Approx. 120g

FAQ for CJ1W-SCU21-V1

What is the maximum cable length for RS-232C?
RS-232C is typically limited to 15 meters. For longer distances, consider using RS-485 modules or adding serial extenders.
Does CJ1W-SCU21-V1 support Modbus RTU?
Yes, the module supports Modbus RTU as both master and slave, enabling communication with many third-party devices.
How are the communication parameters set?
Parameters are configured through CX-Programmer or using the rotary switches on the module front panel.

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