Yokogawa SDV144-S33 16-Channel Digital Input Module

The Yokogawa SDV144-S33 16-Channel Digital Input Module provides 16 isolated no-voltage (dry contact) inputs for Yokogawa CENTUM VP and ProSafe-RS systems, converting field-device signals into digital inputs for control processing. Each channel draws about 6 mA (±20%), with ON resistance ≤1 kΩ, OFF resistance ≥100 kΩ, and supports a maximum input voltage of 30 VDC; the contact rating is 24 VDC at ≥10 mA, with an external 24 VDC power supply (~200 mA) required. The module features 2 kV AC isolation between input and system, a response time ≤40 ms, and rack-mounted mounting (FIO / safety node unit) with 16-channel module isolation. Common replacements include SDV144-S63 (direct replacement, newer model) and SDV144-S13 (alternate configuration), with Yokogawa SDV541 as the digital output counterpart; applications span monitoring ON/OFF signals from switches, relays, and sensors in oil & gas, LNG plants, power generation, and chemical processing to support real-time alarms, interlocks, and equipment status in high-reliability, redundant configurations.