The Omron CJ1W-DRM21 is a DeviceNet communication module from the CJ series, engineered for seamless integration with Omron NJ-series CPUs and other CJ-series systems. Functioning as a CPU Bus unit, it can be mounted on either a CPU rack or an expansion rack, providing flexible installation options within automation networks. The CJ1W-DRM21 supports both DeviceNet Master and DeviceNet Slave modes, allowing versatile communication configurations and network scalability. It accommodates up to 64 units per DeviceNet network, ensuring broad connectivity for distributed I/O and intelligent devices. Operating within a communication power supply range of 11 to 25 VDC, the module consumes 18 mA at 24 VDC from the communications connector, ensuring efficient and stable operation. The CJ1W-DRM21 may be deployed in automation systems across North America, Europe, Asia, and worldwide, enabling robust and reliable DeviceNet communication for industrial control applications.