Omron CJ1W-DRM21 DeviceNet Master/Slave Communication Unit

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?
Our network experts are here to help.

Omron CJ1W Networking: Precision communication. Delivered by Drive Outlet.