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Phone：+86 17062388866Description
The TRICONEX 3481 is a high-reliability Digital Input Module designed for Schneider Electric’s Triconex® TMR (Triple Modular Redundant) safety systems, certified for SIL 3 (Safety Integrity Level 3) per IEC 61508/61511. This module provides critical acquisition of 24-48 VDC discrete signals from field devices (e.g., emergency stops, pressure switches, safety interlocks) in mission-critical applications like emergency shutdown (ESD) and fire & gas (F&G) systems. Featuring 16 optically isolated input channels, the TRICONEX 3481 processes signals through three independent circuits per channel, enabling continuous cross-validation and fault masking. Its robust design ensures <10>
Integrated with Tricon v9–v11 chassis, the module supports hot-swap replacement and provides real-time diagnostics for open wires, short circuits, and internal hardware faults. The TRICONEX 3481 also includes HART® protocol pass-through capability for smart device diagnostics, enhancing predictive maintenance without compromising safety loop integrity.
TRICONEX 3481
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | TRICONEX 3481 |
| Manufacturer | Schneider Electric (Triconex Brand) |
| Product Type | Digital Input Module (TMR) |
| Safety Certification | SIL 3 (IEC 61508/61511) |
| Input Channels | 16 (sink/source configurable) |
| Input Voltage Range | 24–48 VDC (wet), Dry Contact: ≤5 VDC (Off) / ≥15 VDC (On) |
| Isolation | 1,500 VAC channel-to-channel, 2,500 VAC input-to-logic |
| On-State Current | 8 mA (typical) |
| Response Time | <10> |
| HART Support | Protocol pass-through (optional) |
| Diagnostic Coverage | >99% (per IEC 61508) |
| Power Consumption | 1.2 W (from backplane) |
| Operating Temperature | -40°C to +70°C (-40°F to +158°F) |
| Connection | Removable terminal block (0.5–2.5 mm²) |
| Certifications | ATEX, IECEx, UL Class I Div 2, SIL 3 |
Main Features and Advantages
Triple Redundancy per Channel: Each input employs three isolated circuits (sensor, ADC, processor). Results are voted at the controller level (e.g., 3700A), automatically suppressing faulty signals without disrupting safety functions. This achieves Hardware Fault Tolerance (HFT=1) and cuts spurious trips by >95%.
Intelligent Diagnostics: Continuous monitoring detects open circuits, short-to-ground, contact welding, and internal PCB faults. Per-channel LED indicators (green = healthy, red = fault) enable rapid troubleshooting. HART® pass-through retrieves diagnostic data from smart switches (e.g., valve positioners).
Extreme Environment Resilience: Conformal-coated electronics resist humidity, salt spray, and corrosive gases. Wide voltage tolerance (18–60 VDC) accommodates unstable power grids. Hot-swap capability allows replacement in <90>
Application Field
The TRICONEX 3481 secures safety-critical operations:
Oil & Gas: Monitors ESD pushbuttons and gas detectors on FPSOs.
Power Plants: Reads turbine lube oil pressure switches (SIL 3).
Chemical Plants: Detects reactor agitation interlocks and flame arrestors.
Pharmaceutical: Ensures bio-reactor door seals in sterile environments.
Mining: Safeguards conveyor belt emergency pull-cord switches.
TRICONEX 3481
Related Products
TRICONEX 3700A: Main Processor using 3481 inputs for shutdown logic.
TRICONEX 3664: 32-channel digital input module (high-density alternative).
TRICONEX 3625: Digital Output Module for actuating shutdown valves.
TRICONEX 3482: Isolated 48 VDC input variant for noisy environments.
TRICONEX 3301: Power Supply Module for chassis voltage rails.
TRICONEX 4351B: Analog Input Module for process variable monitoring.
