Omron CJ1W-PRM21 Communication Unit

The Omron PRM21 is a high-performance PROFIBUS DP Master unit designed for CJ-series PLCs, enabling seamless connection to PROFIBUS DP field devices such as drives, I/O blocks, sensors, and actuators. Installed as a CPU Bus Unit, the CJ1W-PRM21 provides powerful and flexible control over a PROFIBUS DP network, allowing Omron PLCs to function as the master station in a fieldbus environment.

Ideal for industrial communication applications that require fast, reliable data exchange across distributed automation systems, the CJ1W-PRM21 ensures full compatibility with PROFIBUS DP V1 protocol standards and supports various baud rates and diagnostics tools via configuration software.

Communication Specifications

Model: PRM21 Omron
Communication Type: PROFIBUS DP Master
Supported Protocol: PROFIBUS DP V0/V1 (EN 50170 compliant)
Number of Communication Ports: 1
Connector Type: 9-pin D-sub (RS-485 standard)
Network Topology: Bus topology (with terminating resistors)
Max Devices on Network: Up to 126 PROFIBUS nodes (depending on addressing and power)
Baud Rate Support: 9.6 kbps to 12 Mbps (auto-detect)
Master Types: Class 1 and Class 2 master supported
Network Configuration: Via CX-ConfiguratorFDT or GSD file integration

Electrical & Mechanical

• Power Supply: Supplied from CJ-series rack
• Mounting Method: DIN rail (CPU rack only)
• Expansion Unit Type: CPU Bus Unit
• I/O System: CJ I/O Bus
• Product Dimensions (W × H × D): 31 × 90 × 65 mm
• Weight: 100 g (unpacked)

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
• Vibration Resistance: IEC 60068-2-6
• Ingress Protection: Not specified

System Integration

• Compatible PLCs: Omron CJ1, CJ1M, CJ2 CPU units
• Software Configuration:
  • CX-ConfiguratorFDT
  • GSD file-based device setup
• Data Exchange:
  • Cyclic data exchange for standard PROFIBUS devices
  • Diagnostic and acyclic communication (PROFIBUS DP-V1)
• Unit Type: CPU Bus Unit (counts toward 16-unit CPU Bus limit)
• I/O Mapping: Automatic via configuration software

Applications

Ideal for:

• Fieldbus-based distributed automation systems
• Machine control with multiple intelligent slave devices
• Integration of third-party PROFIBUS I/O, drives, and instrumentation
• Packaging, bottling, and manufacturing lines
• Multi-vendor industrial automation projects

Key Features & Benefits

✅ Full PROFIBUS DP Master Support: V0/V1 support for flexible data exchange and diagnostics.

✅ High-Speed Communication: Baud rates up to 12 Mbps.

✅ Class 1 and 2 Master Functions: Enables both cyclic and acyclic communications.

✅ Compact Design: Only 31 mm wide, ideal for space-restricted control panels.

✅ Seamless CJ-Series Integration: Easy configuration with CX-ConfiguratorFDT.

📦 Available from Drive Outlet Megastore

The Omron CJ1W-PRM21 delivers reliable PROFIBUS master communication in a compact and powerful module. Whether you’re linking I/O, drives, or intelligent field devices, this unit ensures precise, high-speed control across your entire automation network.

Talk to us today for expert integration support and trade pricing.

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