SAMSUNG SSAS-PRO SPDI-24 high-density digital input module
SAMSUNG SSAS-PRO SPDI-24 is an industrial-grade, 24-channel high-density digital input module built specifically for maritime automation, power generation, and heavy industrial machinery monitoring.
Functioning as a critical interface within the Samsung SSAS-Pro (Ship Automation System Pro) architecture, the SPDI-24 converts discrete binary field signals—such as limit switch closures, circuit breaker statuses, pressure trip contacts, and system alarms—into optoisolated logic signals for processing by central automation controllers.
Designed to handle intense vibration, high electromagnetic interference, and variable marine temperatures, the SPDI-24 ensures continuous operational uptime and accurate real-time alarm reporting.
Application Cases
Marine Engine Room Automation: Tracks main engine auxiliary systems, lubricating oil pressure switch statuses, generator running states, and fuel tank high-level alarm switches.
Ship Motion & Steering Control Systems: Monitors limit switches, hydraulic pump statuses, and emergency trip signals on commercial vessels and offshore platforms.
Industrial Auxiliary Plant Management: Collects digital status and fault signals from pump skids, air compressors, cooling water valves, and power distribution switchboards.
Fire & Safety Alarm Panels: Receives dry contact inputs from zone gas detectors, smoke switches, and watertight door sensors across marine vessels.
SPDI-24
Product Advantages and Features
High-Density 24-Channel Layout: Maximizes panel density by processing 24 discrete digital inputs in a single compact module footprint.
Full Optical Isolation: High-grade internal optocouplers isolate field-side electrical surges and noise up to 1500V RMS from the core processing logic.
Advanced Loop Diagnostics: Built-in line fault monitoring detects wire breaks, short circuits, and ground faults on individual channels before system trips occur.
Heavy-Duty Marine Compliance: Meets stringent vibration, humidity, and temperature standards required by major maritime classification societies (DNV, ABS, LR, KR).
Clear Channel Status Visibility: Integrated front-panel LED indicators provide real-time visual verification for each individual channel’s contact status.
Other Models in the Same Series
| Model Code | Component Type | Primary Function |
| SPDI-16 | Digital Input Module | 16-Channel Discrete Input Processing |
| SPDO-16 / SPDO-24 | Digital Output Module | Relay / Solid-State Control Command Outputs |
| SPAI-16 / SPAI-6 | Analog Input Module | 4–20mA / 0–10V Sensor Signal Acquisition |
| SPAO-8 | Analog Output Module | Actuator & Valve Control Signal Generation |
| SPRI-16 | RTD Temperature Input | PT100 Temperature Sensor Interface Module |
| RSPC-X32 | Main System Controller | SSAS-Pro Core Processing Unit |
Installation and Maintenance
Mounting: Secure the module firmly to the 35mm DIN rail or target rack inside the enclosure, ensuring the grounding tab makes solid contact with the metal backplate.
Field Wiring: Wire field contacts (dry or wet switches) to the terminal strip following the pinout assignment for channels 1 through 24.
Bus Interconnection: Connect the redundant system bus cables linking the SPDI-24 to the primary SSAS-Pro rack.
Maintenance Procedure: Regularly check terminal tightness in high-vibration environments. When servicing, deactivate local loops or disable system interlocks before hot-swapping or replacing modules.