YOKOGAWA SDV144-S63 Digital input module
The Yokogawa SDV144-S63 is a high-reliability Digital Input Module designed specifically for the ProSafe-RS Safety Instrumented System (SIS).
Unlike standard DCS modules, the SDV144 is engineered to meet stringent functional safety requirements, often used in Emergency Shutdown (ESD) and Fire and Gas (F&G) systems.
1. Introduction
The SDV144-S63 is a 16-channel, 24V DC digital input module.
The “S6” in the suffix typically indicates that the module features conformal coating (ISA G3 compliant) for protection against corrosive environments, while the “3” denotes the specific revision or style.
It performs continuous self-diagnostics to detect internal failures, ensuring that it will “fail-safe” in the event of a hardware malfunction.
It is a core component for achieving SIL3 (Safety Integrity Level 3) ratings in industrial processes.
2. Technical Parameter Table
SDV144-S63
| Feature | Specification |
| Number of Inputs | 16-channel, isolated |
| Input Voltage | 24 V DC |
| Input ON/OFF Voltage | ON: $\ge$ 18 V DC; OFF: $\le$ 5 V DC |
| Input Current (at 24V) | Approx. 4.1 mA per channel |
| Self-Diagnostics | Periodic pulse testing for “stuck-at” faults |
| Isolation | Channels are isolated from the system logic |
| Redundancy | Supported (can be used in dual-redundant pairs) |
| Current Consumption | Max. 0.5 A (Internal 5V DC) |
| Environment Protection | S6 Suffix: G3 Conformal Coating |
| Safety Certification | TUV SIL3 certified (when used in ProSafe-RS) |
3. Product Advantages and Features
Built-in Self-Test: The module executes a “line-fault” detection and internal pulse test to ensure that the input circuitry hasn’t failed in a way that would mask a real safety signal.
SIL3 Compliance: Specifically designed to meet IEC 61508 safety standards, providing the highest level of risk reduction for a single logic solver.
Dual Redundancy: Two SDV144 modules can be paired to ensure that a single module failure does not cause a process trip (High Availability).
Hot-Swappable: Modules can be replaced while the safety system is active without interrupting the logic or causing a trip.
High Resolution Status: Provides not just “ON/OFF” data, but also diagnostic information regarding the health of the field wiring (with appropriate terminal boards).
4. Application Cases
Emergency Shutdown (ESD): Monitoring push-buttons, pressure switches, or level switches that trigger a plant shutdown during a dangerous event.
Fire and Gas (F&G) Systems: Interfacing with smoke detectors, heat sensors, or flame detectors to initiate fire suppression.
Burner Management Systems (BMS): Ensuring safety interlocks are met before and during the operation of industrial boilers or furnaces.
High-Pressure Protection: Connecting to pressure-sensing elements to prevent vessel over-pressurization.
5. Related Models & Same Series
The SDV144 is part of the ProSafe-RS FIO (Field network I/O) family.
Other Models in the Same Series
SDV531 / SDV541: Digital Output Modules (Safety) used to actuate valves or trip relays.
SDV144-S13 / S53: Variants with different coating levels or revision styles.
SAI143: Analog Input Module (Safety) for 4-20 mA safety-critical transmitters.
SAV144: A version of the digital input module with different voltage thresholds or interface specs.
Related System Components
SSC60S / SSC60D: Safety Control Stations (CPUs) that process the logic from the SDV144.
SST144: Specialized Terminal Boards used to connect field wiring to the SDV144.
AKB331: Cables used to connect the SDV144 to its terminal board.
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