Product Overview

The Yokogawa SDV144-S33 is a high-reliability, 16-channel digital input module specifically engineered for use within the ProSafe-RS Safety Instrumented System (SIS). This module is designed to interface with non-voltage contact signals (dry contacts) from field-side safety devices such as emergency stop buttons, flame detectors, and limit switches. By providing SIL3-level safety integrity (when used in a redundant configuration), the SDV144-S33 ensures that critical process data is acquired with the highest degree of diagnostic coverage and fault tolerance.

Integrated into the FIO (Field Interface Orbus) architecture, the SDV144-S33 excels in environments where rapid response and electrical isolation are non-negotiable. Its robust circuitry is built to filter out industrial noise while maintaining a fast scan cycle, making it an essential component for Burner Management Systems (BMS), Emergency Shutdown Systems (ESD), and Fire and Gas Systems (FGS).

Technical Specifications

• Manufacturer: Yokogawa

• Model Number: SDV144-S33

• Module Type: Digital Input Module (Safety Type)

• Number of Channels: 16 channels, isolated

• Input Type: Dry contact (non-voltage)

• Rated Input Voltage: 24 V DC

• ON/OFF Threshold: ON at < 1 kΩ; OFF at > 100 kΩ

• Response Time: 40 ms or less (safety logic dependent)

• Withstand Voltage: 2 kV AC for 1 minute (Input to System)

• Power Consumption: Max. 350 mA at 5 V DC; 150 mA at 24 V DC

• Operating Temperature: -20°C to +70°C

• Dimensions: 32.8 mm x 106.3 mm x 130 mm

• Weight: 0.3 kg

• Origin: Japan

Key Technical Characteristics

• ProSafe-RS Safety Integration: Purpose-built for safety applications, the module supports extensive self-diagnostics to detect internal hardware failures and external circuit faults (such as short circuits or wire breaks).

• High-Voltage Galvanic Isolation: Provides a robust 2 kV AC dielectric strength, effectively protecting the safety controller's backplane from field-side electrical surges and complex ground loop interference.

• High-Speed Signal Processing: Features a refresh cycle and signal conditioning logic optimized for safety-critical loops, ensuring that any change in field status is processed and acted upon in less than 40 milliseconds.

• Versatile Field Connectivity: Supports multiple wiring methods including pressure-clamp terminals, MIL connector cables, and dedicated signal adapters, providing flexibility during cabinet integration and system commissioning.

• Redundancy and Availability: Fully supports dual-redundant pairing. When configured as a redundant set, the module ensures continuous safety monitoring and prevents nuisance trips caused by a single hardware failure.

• Environmental Durability: Designed to operate in high-temperature industrial environments (up to +70°C), meeting the requirements for installation in rugged, unconditioned field enclosures.