Omron CJ1W-SCU21-V1 Serial Communications Unit

The Omron SCU21-V1 series comprises advanced Serial Communication Unit designed for the CJ-series modular PLC platform, providing flexible, high-speed serial interfacing with a wide range of industrial devices. Each model offers 2 serial ports, configurable as RS-232C or RS-422A/485, and supports multiple communication protocols, including Host Link, NT Link, Serial Gateway, Protocol Macro, and Modbus-RTU Slave.

Ideal for barcode readers, temperature controllers, inverters, and other serial devices, these CPU Bus Units offer robust features like protocol macros, FINS-to-Modbus conversion, and simple backup, ensuring seamless integration and advanced serial data handling across automation systems.

Model Variants & Interfaces

“x” indicates additional 0.15 A per NT-AL001 adapter connected for power supply via port.

Communication Protocols & Modes

• Supported Protocols (per port):
  • Host Link (C-mode, FINS)
  • NT Link
  • No-protocol (free-format communication)
  • Serial Gateway (FINS to Modbus/CompoWay/F)
  • Protocol Macro (user-defined message handling)
  • Modbus-RTU Slave (Unit Ver. 1.3+)
• Port Configurations:
  • 1:1 or 1:N RS-232C (up to 32 units with adapters)
  • 1:N RS-422A/485 (up to 32 devices)
  • Baud Rates: 1,200 – 230,400 bps
  • Max Distance: RS-232C (15 m), RS-422A/485 (up to 1,200 m depending on model)

Key Functional Features

• Protocol Macro:
  • 20 protocols max.
  • 60 sequences, 300 messages, 100 reception matrices per protocol
  • Up to 1,000 total sequences
  • 1,000-byte message max length
  • Control via PMCR (260) instruction
• Serial Gateway:
  • Converts FINS to Modbus RTU/ASCII, CompoWay/F
  • Queuing up to 5 commands
  • Timeout and delay monitoring
• No-Protocol Mode:
  • Free ASCII or binary messaging
  • Up to 259 bytes per message
  • TXDU(256) / RXDU(255) or NJ Series Serial instructions
• Modbus-RTU Slave:
  • Fully compliant Modbus protocol support
  • Function codes: 01, 02, 03, 04, 05, 06, 08, 0F, 10
  • Address range: 1–247 (0 for broadcast)

CJ1W-SCU21-V1 Electrical & Mechanical

• Power Supply Voltage: Supplied by CPU rack
• Mounting Method: DIN rail via CPU rack
• Unit Type: CPU Bus Unit
• Max Units per CPU Rack: 16 total CPU Bus Units
• No slot restriction (except for interrupt functionality)
• Size (W × H × D): 31 × 90 × approx. 85 mm

Environmental Ratings

• Operating Temperature: 0 to 55°C
• Storage Temperature: –20 to 75°C
• Humidity Range: 10% to 90% RH (non-condensing)
• Shock Resistance: IEC 60068-2-27 compliant
• Vibration Resistance: IEC 60068-2-6 compliant

Software Integration

• Setup Tool: CX-Protocol (for protocol macros)
• Programming Support: Ladder instructions – TXD, RXD, PMCR, TXDU, RXDU, DTXDU, DRXDU
• Backup Functionality: Backup protocol macro data to CPU memory card (CJ1-H/CJ1M CPUs)

CJ1W-SCU21-V1 Key Features & Benefits

✅ Dual Serial Ports: RS-232C or RS-422A/485 configurable for flexible field device interfacing.

✅ Multi-Protocol Support: Built-in support for Host Link, Modbus-RTU, Protocol Macro, and more.

✅ Macro-Driven Messaging: Build advanced communication flows using CX-Protocol and ladder logic.

✅ Serial Gateway Ready: Convert FINS to Modbus or CompoWay/F on the fly.

✅ High-Speed Baud Rates: Communicate up to 230,400 bps for demanding devices.

📦 Available from Drive Outlet Megastore

The Omron CJ1W-SCU21-V1 series Serial Communication Unit offer unmatched flexibility and protocol support for industrial serial interfacing. Whether you need to integrate Modbus slaves, develop custom communication macros, or extend data connectivity across your control system—this series delivers.

Contact our experts today for unit compatibility and discounted trade pricing.

Connect with confidence. Control with precision. Only at Drive Outlet.