The Omron CQM1-ARM21 AS-Interface Master Unit is a compact yet high-performance communication module designed to enhance data exchange and control efficiency in industrial automation systems. Functioning as an AS-Interface (Actuator Sensor Interface) master, it supports communication with up to 31 AS-Interface slave devices, enabling streamlined data transfer and optimized system coordination. Engineered for durability, the CQM1-ARM21 operates reliably within a wide ambient temperature range of 0 to +55°C, making it suitable for various industrial environments. It features built-in status displays for monitoring unit, network, and slave communication conditions, allowing real-time diagnostics and simplified maintenance. The CQM1-ARM21 could be deployed in automation networks across North America, Europe, Asia, and other global markets, providing efficient data integration, robust performance, and enhanced process automation within Omron’s CQM1 series PLC systems.