Description
The part number 3625 (often referred to as TRICON 3625) specifies a 32-Point Supervised/Non-Supervised Digital Output (DO) Module designed for the Triconex Tricon Safety Instrumented System (SIS) by Schneider Electric (Invensys).
Technical Specifications
| Feature | Specification |
| Manufacturer | Triconex (Schneider Electric / Invensys) |
| Product Type | TMR Digital Output Module (Supervised/Non-Supervised) |
| Nominal Voltage | 24 VDC |
| Voltage Range | 16 to 32 VDC (Maximum: 36 VDC) |
| Number of Output Signals | 32 points, commoned |
| Current Rating | 1.7 A max per point (7 A surge per 10 ms) |
| Point Isolation | 1,500 VDC |
| Safety Integrity Level | Suitable for up to SIL 3 applications (IEC 61508) |
| Architecture | Triple Modular Redundancy (TMR) |
Product Overview
The Triconex 3625 is a high-integrity digital output module engineered for safety-critical industrial processes where fault tolerance and high availability are mandatory. Based on Triconex’s signature Triple Modular Redundancy (TMR) architecture, the module uses three independent paths and majority voting to virtually eliminate single-point failures and spurious trips.
Key Features:
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Supervised & Non-Supervised Flexibility: Ideal for critical safety functions (such as emergency shutdown systems, fire and gas protection, and turbine trip control) where outputs remain in a single state for extended periods.
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TMR Fault Tolerance: Automatically detects and isolates internal or external faults in real-time without interrupting the controlled process.
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Hot-Spare Capability: Supports online replacement of modules (hot-swapping) via a separate External Termination Panel (ETP) and dedicated cable interface to minimize system downtime during maintenance.
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Advanced Diagnostics: Continuous self-monitoring and circuit checking provide immediate status feedback on channel health, load continuity, and power supplies.
3625
Core Features
• TMR three-channel independent circuit design, majority voting mechanism, single channel fault will not cause output failure
• Total 32 sinking digital output channels, commoned terminal layout, 24VDC field power
• Supports supervised mode: detect open circuit, missing load, short circuit, power loss on field wiring
• Voltage & current loopback self-diagnosis, continuously monitor output switch and field loop status
• Built-in overcurrent short-circuit protection, no need for external fuses on module side
• Hot-swappable during system operation; replaceable without rack power-off
• Front panel LED indicators display channel activity, module fault and communication status
• PCB conformal coating option, strong anti-vibration and temperature adaptability
• Interconnected with main controller via TriBus internal rack bus, deterministic real-time output
Typical Application Scenarios
Petrochemical & Refining Plants
ESD emergency shutdown valve control, reactor safety interlock output.
Thermal & Combined Cycle Power Plants
Gas turbine / steam turbine burner management, unit trip protection output.
Onshore & Offshore Oil & Gas Platforms
Compressor safety interlock, fire & gas protection system control output.
Chemical Process Units
Safety instrumented system interlock and emergency cut-off control.
Tricon SIS System Upgrade & Spare Replacement Projects
Direct replacement for aging digital output modules of existing Tricon safety racks.
