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CJ1W-SCU21-V1

Omron CJ1W-SCU21-V1 Serial Communication Unit RS-232C

SKU: CJ1W-SCU21-V1

USD 105.00

Omron CJ1W-SCU21-V1 is an RS-232C serial communication unit for CJ series PLCs, enabling serial device connectivity.

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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: CJ1W

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 CJ1W
Type Serial Communication Unit
Ports 1x RS-232C
Protocols Host Link, Modbus-RTU, NT Link, Protocol Macro
Baud Rate 300 bps to 115.2 kbps
Connection 9-pin D-sub connector
Isolation Optical isolation
Current Consumption 100mA at 5VDC
Operating Temperature 0 to +55°C
Mounting CJ series backplane

FAQ for CJ1W-SCU21-V1

What devices can I connect via RS-232C?
HMIs (serial), barcode readers, scales, printers, VFDs (Modbus-RTU), temperature controllers, and any device with RS-232 interface. Common for legacy equipment integration.
What's the maximum cable length?
RS-232C: 15m maximum at 19.2kbps, shorter at higher baud rates. For longer distances, use RS-422/485 (CJ1W-SCU22/SCU31/SCU42) with up to 500m range.
Can I use Modbus-RTU with this unit?
Yes, CJ1W-SCU21-V1 supports Modbus-RTU master/slave. Connect to Modbus devices (VFDs, meters, etc.). Configure baud rate, parity, slave address in unit setup.
How many serial units can I use?
Up to 40 units total in CJ system. Limited by CPU's I/O capacity and power budget. Each serial unit uses 100 I/O words.

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