Omron CJ1W-DRM21 DeviceNet Master/Slave Communication Unit for CJ-Series PLCs

The Omron CJ1W-DRM21 is a robust DeviceNet Master/Slave communication unit designed for seamless integration within the CJ-series modular PLC platform. Operating on the CJ I/O bus and mounted via CPU Bus Unit interface, it enables high-speed, reliable communication across DeviceNet networks with a single port supporting master or slave configurations. Ideal for distributed I/O and device control, the CJ1W-DRM21 facilitates communication between the CJ PLC and a wide range of field devices.

This compact and lightweight module supports cyclic, polling, and change-of-state communication, making it suitable for real-time industrial control environments.

Technical Specifications

Model: CJ1W-DRM21 Omron
Series: CJ1W
Product Type: DeviceNet Communication Unit
Mounting Type: DIN rail (CJ-series backplane)
Bus Type: CPU Bus Unit
I/O System: CJ I/O Bus
Weight (Unpacked): 120 g
Dimensions (W × H × D): 31 × 90 × 78.7 mm
Degree of Protection: IP20 (when mounted in enclosure)

Communication Specifications

• Communication Type: DeviceNet Master and Slave
• Communication Port(s): 1
• Supported Communication Modes: Cyclic, Polling, Bit-Strobe, Change-of-State
• Baud Rates: 125 kbps, 250 kbps, 500 kbps
• Max Network Nodes: 63
• Max Slaves (as Master): 63 devices
• Connection Method: Open-style terminal block (removable)
• Addressing: DIP switch or software-configurable

I/O & System Integration

• Compatible PLCs: Omron CJ1, CJ2, and CS1 series
• Network Topology: Bus, tree, trunk-line/branch-line
• Power Supply for DeviceNet Bus: External (not powered by unit)
• Error Detection: CRC, timeout, disconnect detection
• Isolation: Optical isolation between internal and DeviceNet lines
• Configuration Tool: CX-Integrator (Omron software)

Environmental & Mechanical

• Operating Temperature: 0 to 55°C
• Storage Temperature: –25 to 70°C
• Humidity (Operating): 10–90% RH (non-condensing)
• Shock Resistance: IEC 60068-2-27
• Vibration Resistance: IEC 60068-2-6
• Altitude: Up to 2000 m
• Cooling Method: Natural convection

Applications

Ideal for:

• Connecting CJ-series PLCs to DeviceNet field I/O and sensors
• Machine-level communication with third-party DeviceNet devices
• Distributed control in packaging, material handling, and automotive systems
• Real-time networked control using cyclic and change-of-state messaging

Key Features & Benefits

✅ Master/Slave Support: Operates as either a DeviceNet master or slave.

✅ Single Communication Port: Compact integration with robust communication.

✅ Flexible Network Topology: Supports various wiring configurations and up to 63 nodes.

✅ High-Speed Performance: Supports 125 to 500 kbps DeviceNet speeds.

✅ Software-Configurable: Fully programmable via Omron’s CX-Integrator tool.

📦 Available from Drive Outlet Megastore

The Omron CJ1W-DRM21 brings industrial-grade DeviceNet networking into your CJ-series PLC architecture—ensuring reliable, distributed control in demanding environments.

Need help configuring your DeviceNet system or sourcing termination resistors, trunk cables, or expansion racks?
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Omron CJ1W Networking: Precision communication. Delivered by Drive Outlet.