Yokogawa Electric Corporation SDV144-S63 Digital Input Module

The Yokogawa SDV144-S63 Digital Input Module is a 16-channel, isolated-no-voltage input module designed for CENTUM VP and ProSafe-RS systems, converting dry-contact field signals into reliable digital inputs for real-time control. In harsh industrial environments it supports redundant configurations for safety-critical applications and is used to monitor ON/OFF signals from switches, relays, and sensors across oil & gas, LNG plants, chemical processing, and power generation facilities. Key specifications include module-level isolation (2 kV AC withstand), input current ~6 mA per channel with ON resistance ≤1 kΩ and OFF resistance ≥100 kΩ, contact rating 24 VDC (+20% / -10%), ≥10 mA, and an external 24 VDC power supply with ~200 mA capacity. The module accepts no-voltage (dry contact) signals and tolerates a maximum input voltage of 30 VDC, with a response time ≤40 ms. It weighs about 0.4–0.6 kg and operates from −20 to 70 °C. Common replacements include Yokogawa SDV144-S53 (newer revision), SDV144-S33 / S13 variants, and the Yokogawa SDV541 digital output counterpart.