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Description
Product Overview
The Triconex 3351S2 is a high-integrity safety controller module from Schneider Electric’s Triconex line, designed for mission-critical safety instrumented systems (SIS). As part of the Tricon v9/v10 platform, the 3351S2 provides triple modular redundant (TMR) architecture to ensure fault-tolerant operation in hazardous industrial environments. This module serves as a core processing unit, executing safety logic solvers while maintaining continuous diagnostics for fire and gas detection, emergency shutdown (ESD), and turbine control systems.
The Triconex 3351S2 integrates advanced diagnostics with 2-out-of-3 (2oo3) voting logic to eliminate single points of failure. Its ruggedized design supports operation in extreme conditions, making it ideal for oil refineries, nuclear plants, and chemical processing facilities. The module’s TMR architecture ensures simultaneous processing across three independent channels, with automatic fault detection and reconfiguration. Compatible with TriStation 1131 engineering software, the 3351S2 enables seamless integration with legacy and modern control systems while meeting IEC 61508 SIL 3 safety requirements.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 3351S2 |
| Manufacturer | Triconex (Schneider Electric) |
| Product Type | Triple Modular Redundant (TMR) Safety Controller |
| Processor | 32-bit RISC (Triple Redundant) |
| Memory | 64 MB SDRAM (per channel), 16 MB Flash |
| I/O Capacity | Supports up to 15,000 I/O points |
| Communication Ports | 2x Ethernet TCP/IP, 3x RS-485 (Modbus) |
| Diagnostics | Online module health monitoring |
| MTBF | >100 years (calculated) |
| Operating Temperature | -40°C to +70°C |
| Certifications | SIL 3, ATEX, IEC 61511, ISO 13849 |
| Power Supply | 24 VDC ±10% (redundant inputs) |
Key Features Description
Key Features DescriptionThe Triconex 3351S2 delivers unmatched safety performance through its patented TMR technology. Each of the three independent channels processes data simultaneously, with a dedicated voter circuit comparing results in real time. If a discrepancy is detected, the module automatically isolates the faulty channel while maintaining continuous operation.
Advanced fault containment:
Built-in diagnostics monitor processor health, memory integrity, and communication links, triggering alarms for degraded performance. The 3351S2 supports hot-swappable replacement without system shutdown, critical for continuous process industries. Its “Fault Insertion Test” capability allows engineers to simulate failures for safety system validation.
The module’s dual Ethernet ports enable seamless integration with distributed control systems (DCS) via OPC UA, while triple RS-485 ports support legacy field devices. With 64 MB of error-correcting memory per channel, it handles complex safety logic for large-scale installations. The 3351S2 also features non-intrusive firmware updates, ensuring compliance with evolving cybersecurity standards like IEC 62443.
Application Areas
The Triconex 3351S2 is deployed in industries where safety failures could result in catastrophic consequences. In offshore platforms, it manages emergency shutdown systems for blowout preventers. Nuclear facilities utilize its TMR architecture for reactor cooling pump control, while LNG terminals rely on it for flame detection and gas suppression.
Critical implementations include:
- Petrochemical plant burner management systems
- Pharmaceutical batch reactor overpressure protection
- Power grid substation fault isolation
- Aerospace test facility emergency stops
- Railway signaling system fail-safes
The module’s -40°C cold-start capability ensures reliability in Arctic oil fields, while its vibration resistance (5g @ 15–2000 Hz) suits mobile drilling rigs. In hydrogen production plants, the 3351S2 monitors electrolyzer safety interlocks, and in data centers, it oversees fire suppression systems.
Related Products
- 3503E: Analog Input Module (TMR)
- 4351B: Communication Module for Tricon v11
- 3008: Digital Output Module
- 9662-810: Redundant Power Supply
- 4000093-002: TriStation 1131 Software License
- 8312: Remote I/O Interface
- 3625X: HART Analog Input Card
Product Assurance
Triconex guarantees the 3351S2 with a 15-year product lifecycle commitment and a 3-year warranty covering all manufacturing defects. Each module undergoes rigorous testing, including 500-hour burn-in and 50g shock/vibration validation. Certified to SIL 3 standards, it includes full FMEDA (Failure Modes Effects and Diagnostic Analysis) documentation for safety compliance. Schneider Electric’s global support network provides 24/7 technical assistance, with firmware updates addressing cybersecurity vulnerabilities. The 3351S2 is backed by Triconex’s “Never Fail” commitment, offering priority replacement and on-site engineering support for critical failures.
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