The ABB CMOD-01 (often referenced as CMOD-OI) is a highly reliable multifunction extension module engineered to expand the capabilities of ABB industrial drives and control systems. This versatile plug-in module provides an external 24V AC/DC auxiliary power input, ensuring that the drive’s control unit remains fully operational and communicative even when the main power supply is disconnected. Additionally, the module expands the system’s I/O capabilities by offering one digital output (DO1) and two relay outputs (RO4 and RO5) for flexible signaling, monitoring, and process control. Designed for seamless integration, it features a clear status LED indicator and mounts securely via a chassis interface with a backplane connector. With its robust construction and RoHS compliance, the CMOD-01 (Product Code: 3AUA0000118622) is an essential upgrade for demanding industrial automation environments.