SDV521-S33 S2 Yokogawa ProSafe-RS | Isolated Digital Output

Product Overview

The SDV521-S33 S2 (Model: SDV521-S33 S2) is a high-integrity digital output module engineered for the Yokogawa ProSafe-RS Safety Instrumented System (SIS). As part of the FIO (Field Interface I/O) family, this module provides 16 isolated channels specifically designed to drive field actuators, solenoids, and relays within safety-critical loops. The SDV521-S33 S2 (Part Number: SDV521-S33 S2) is built to meet SIL 3 requirements, ensuring that emergency shutdown (ESD) and fire and gas (F&G) systems execute their safety functions with maximum reliability.

Equipped with advanced internal diagnostics, the SDV521-S33 S2 (Model: SDV521-S33 S2) monitors for field wiring faults and internal circuit failures. Its robust galvanic isolation—both channel-to-channel and channel-to-system—prevents electrical noise and surges from propagating through the safety network. This makes it a standard choice for high-availability environments such as offshore platforms, chemical refineries, and LNG terminals.

Detailed Technical Specifications

The SDV521-S33 S2 is designed for the rigorous demands of safety-certified process automation.

• Manufacturer: Yokogawa

• Model Number: SDV521-S33 S2

• System Compatibility: ProSafe-RS Safety Instrumented System

• Interface Type: FIO (Field Interface I/O)

• Number of Channels: 16 Isolated Digital Outputs

• Output Voltage Range: 24 V DC (Operational range 12V to 30V DC)

• Load Current: Maximum 0.6 A per channel (Note: Total module current is limited by internal thermal protection; 2A aggregate typical)

• Response Time: < 40 ms (Safety function response)

• Isolation: 500 V AC between field and system; 500 V AC channel-to-channel

• Diagnostic Functions: Short-circuit protection, open-circuit detection (during ON/OFF states), and over-temperature shutdown

• Internal Power Consumption: 5 V DC at 350 mA (Backplane current)

• External Power Supply: 24 V DC (Via terminal block)

• Operating Temperature: –10°C to +55°C

• Storage Temperature: –30°C to +70°C

• Dimensions: 130 mm $\times$ 32.8 mm $\times$ 125.5 mm

• Weight: 0.36 kg

• Certification: SIL 3 (IEC 61508), CE, TUV, ATEX (Explosion protected)

• Origin: Japan