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CJ1W-SCU22

Omron CJ1W-SCU22 Serial Communication Unit RS-422/RS-485

SKU: CJ1W-SCU22

USD 170.00

Omron CJ1W-SCU22 is a serial communication unit for CJ series PLCs with RS-422/RS-485 ports for multi-drop networking.

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Product Overview

The Omron CJ1W-SCU22 is a serial communication module for CJ1 series PLCs, providing reliable RS-422 or RS-485 connectivity for industrial automation systems. This module supports RS-422 and RS-485 standards, enabling connection to multiple devices in multi-drop network configurations. The RS-485 port supports up to 32 devices, making it ideal for networked applications requiring multiple nodes. The CJ1W-SCU22 supports multiple protocols including Omron-specific protocols, Modbus RTU for third-party device integration, and general ASCII communication. The module includes buffer memory for handling data exchange without impacting PLC scan time, ensuring reliable communication. Configuration is easily achieved through CX-Programmer or the module front panel switches. The CJ1W-SCU22 is hot-swappable, allowing module replacement without powering down the PLC system. LED status indicators provide monitoring of communication activity and error conditions. Applications include connection to multiple VFDs, networked sensor systems, legacy device interface, and any application requiring multi-drop serial connectivity.

  • SKU: CJ1W-SCU22
  • Series: CJ1W

Best-Fit Applications

  • Multiple VFD networks
  • Sensor network connectivity
  • Legacy equipment interface
  • Process automation
  • Multi-drop serial networks
  • Building automation
  • Remote I/O communication
  • Industrial networking

Buying Checklist

  • Multi-drop network capability
  • Modbus support for third-party
  • Hot-swappable for maintenance
  • LED diagnostics
  • Compact design
  • Proven CJ1 compatibility
  • Easy configuration
  • Omron quality

Technical Specifications

Model CJ1W-SCU22
Series CJ1W
Type Serial Communication Unit
Ports 1x RS-422/RS-485
Protocols Host Link, Modbus-RTU, NT Link, Protocol Macro
Baud Rate 300 bps to 115.2 kbps
Max Stations 32 stations (multi-drop)
Max Distance 500m (RS-485)
Isolation Optical isolation
Connection Terminal block
Current Consumption 100mA at 5VDC
Operating Temperature 0 to +55°C
Mounting CJ series backplane

FAQ for CJ1W-SCU22

What's the advantage of RS-485 vs RS-232C?
RS-485: multi-drop (up to 32 stations), longer distance (500m vs 15m), better noise immunity. RS-232C: point-to-point only, shorter distance. Choose RS-485 for multi-device networks.
How do I wire RS-485 multi-drop?
Daisy-chain devices: A to A, B to B. Terminate both ends with 120Ω resistor. Use twisted pair cable. Ground shield at one end only. Follow Modbus wiring guidelines.
Can I use this for VFD communication?
Yes, common application. Most VFDs support Modbus-RTU over RS-485. Configure CJ1W-SCU22 as Modbus master, VFDs as slaves. Control speed, monitor status, read parameters.
What's the maximum baud rate?
115.2 kbps maximum. Actual rate depends on cable length and noise environment. For long distances (>200m), use lower baud rate (9600 or 19200 bps) for reliability.

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