Name: TRICONEX 4351B | Triple Modular Redundant (TMR) Digital Input Module
Availability: InStock

Description

Technical Specifications

Key Features and Advantages

The 4351B sets the safety benchmark with its Triple Modular Redundant architecture, providing 99.9999% system availability in critical shutdown applications. Each input channel is physically triplicated across three isolated subsystems, with continuous discrepancy detection resolving faults within 50ms. The module’s patented Contact Life Enhancement circuit reduces arcing by 80%, extending field device longevity in high-cycle applications like emergency venting systems.

Advanced diagnostics: On-chip health monitoring detects degraded contacts (≥500Ω resistance) before failure occurs. The Synchronous Sampling Engine eliminates voting mismatches caused by signal bounce. Integrated HART pass-through allows simultaneous digital communication with smart transmitters without additional wiring. The hot-swappable design enables module replacement under full operational load, crucial for continuous processes in refineries.

Application Areas

In offshore drilling platforms, the 4351B processes 500+ safety signals per second for ESD (Emergency Shutdown) systems, maintaining SIL 3 compliance even during hurricane-force vibrations. Nuclear power plants utilize its radiation-hardened design (100 kRad tolerance) for reactor protection system inputs. LNG terminals leverage the module’s -40°C cold-start capability to monitor cryogenic storage tank safety valves.

Automotive manufacturing lines deploy this module for robotic cell emergency stops, where its 5ms response time prevents equipment damage during collision events. The built-in SOE (Sequence of Events) timestamping (±1ms accuracy) is critical for post-incident analysis in turbine trip scenarios.

Related Products

4329B: Analog Input Module with TMR temperature monitoring.
3805E: Main Processor for Trident Safety Systems.
4352B: Digital Output Module with forced-guided relays.
8312: TMR Power Supply with automatic load balancing.
9674-810: Safety Network Gateway for OPC UA integration.
4351B-ENT: Ethernet-Enabled Version with CIP Safety.

Installation and Maintenance

Installation preparation: Use Belden 9501 shielded cable for all 4351B field connections, maintaining 50mm separation from AC power lines. Apply 24V wetting voltage through redundant power feeds with <1% voltage differential between TMR legs. Perform channel mapping in TriStation 1131 software before physical wiring.

Maintenance recommendations: Exercise input contacts annually using the built-in Test Pulse feature (500ms duration). Replace terminal blocks every 100,000 insertion cycles or 10 years. Perform full TMR alignment checks during turnaround periods using the Tri-SIMULATOR diagnostic toolkit. Update firmware via USB service port during planned outages.

Product Assurance

Every 4351B undergoes 90-day burn-in testing followed by 100,000 cycle endurance validation. Our Safety Critical Exchange Program provides advance replacement units within 8 hours for certified facilities. The 10-year warranty includes free access to Triconex Diagnostic University™ training modules. Lifetime firmware updates ensure continued compliance with evolving functional safety standards.

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