TRICONEX AI 3351S2 Analog Input Module – Tricon Triple Modular Redundancy Safety System
Imagine a critical process plant — a refinery, an offshore platform, or a chemical reactor — where the safety instrumented system suddenly loses its analog signal acquisition capability. Without a functioning analog input module, the SIS controller becomes blind to field transmitter data: pressure, temperature, flow, and level readings vanish from the safety logic solver. The result is an uncontrolled process, potential SIL degradation, and in the worst case, a catastrophic safety event. The TRICONEX AI 3351S2 exists precisely to prevent this scenario, delivering fault-tolerant, triple-redundant analog signal acquisition that keeps your safety loop intact even under single or double hardware failures.
The AI 3351S2 is a 16-channel analog input module engineered for the Triconex Tricon Triple Modular Redundancy (TMR) platform — one of the most widely deployed Safety Instrumented Systems (SIS) in the global process industry. Certified to IEC 61511 and IEC 61508 SIL 3, this module occupies a critical position in safety architectures across oil & gas, petrochemical, nuclear, and power generation facilities worldwide. Its 3-2-1-0 fault tolerance architecture ensures continuous operation and safe-state transition even when individual hardware channels degrade, making it the benchmark for high-availability analog input in safety-critical environments.
Technical Specifications
- Part Number / SKU: AI 3351S2
- Manufacturer: TRICONEX (Schneider Electric)
- Series: Tricon TMR Safety System
- Module Type: Analog Input Module
- Number of Channels: 16 channels (8 per leg × 3 TMR legs)
- Input Signal Range: 4–20 mA (current loop)
- Resolution: 12-bit A/D conversion
- Isolation: Channel-to-channel and channel-to-backplane optical isolation
- Safety Integrity Level: SIL 3 (IEC 61508 / IEC 61511)
- Architecture: Triple Modular Redundancy (TMR) — 3-2-1-0 fault tolerance
- Backplane Interface: Tricon main chassis backplane compatible
- Operating Temperature: 0°C to 60°C
- Power Consumption: Per Triconex chassis specification
- Certifications: IEC 61508, IEC 61511, FM, CE
- Form Factor: Single-slot Tricon module
Key Features & Benefits
- Triple Redundant Signal Acquisition: Three independent A/D conversion paths vote on each analog value, eliminating single-point failures and ensuring measurement integrity at all times.
- SIL 3 Certified Safety Performance: Meets the highest functional safety requirements for process industry SIS applications, supporting your IEC 61511 safety lifecycle compliance.
- Hot-Swap / Online Replacement: Modules can be replaced under power without shutting down the safety system, minimizing maintenance downtime in continuous-process facilities.
- Comprehensive Diagnostics: Built-in self-diagnostics continuously monitor channel health, wiring integrity, and A/D converter status, reporting faults to the Tricon controller in real time.
- High Channel Density: 16 analog input channels per module slot maximize I/O density in the Tricon chassis, reducing hardware footprint and installation cost.
- Optical Isolation: Full galvanic isolation protects the safety controller from field-side transients, ground loops, and EMI — essential in harsh industrial environments.
- Seamless Tricon Integration: Plug-and-play compatibility with Tricon main chassis, power modules, and TriStation 1131 programming environment requires no additional configuration hardware.
Industry & Equipment Applications
- Oil & Gas: Upstream wellhead control, midstream pipeline ESD, downstream refinery SIS — pressure and flow transmitter inputs for emergency shutdown logic.
- Petrochemical & Chemical: Reactor temperature and pressure monitoring, burner management systems (BMS), high-integrity pressure protection systems (HIPPS).
- Power Generation: Turbine protection systems, boiler safety interlocks, nuclear plant safety instrumented functions (SIF).
- LNG & Offshore Platforms: Subsea and topside safety systems requiring SIL 3 analog acquisition in explosive atmospheres.
- Pulp & Paper / Mining: Process safety systems where continuous analog monitoring of critical variables is mandatory for regulatory compliance.
System Integration & Compatible Parts
The AI 3351S2 is designed for seamless integration within the Triconex Tricon TMR ecosystem. Compatible and commonly paired components include:
- Tricon Main Chassis: 3700A, 3706A, 3721 — standard and extended chassis configurations
- Power Modules: 8310, 8312 — redundant DC power supplies
- Communication Modules: 4351B, 4352B — Tricon communication interface modules
- Digital Output Modules: DO 3401, DO 3601 — for SIS final element control
- Analog Output Modules: AO 3805E — for closed-loop safety control
- Programming Software: TriStation 1131 v4.x / v9.x — IEC 61131-3 compliant SIS programming environment
- Field Termination Assemblies: Compatible FTAs for 4–20 mA field wiring termination
Our Quality Assurance Process
At Konmask.com, every TRICONEX AI 3351S2 module undergoes a rigorous multi-stage verification process before shipment:
- Authenticity Verification: Serial number and date code cross-referenced against manufacturer records to confirm genuine TRICONEX origin.
- Visual & Physical Inspection: Full inspection of PCB, connectors, backplane edge contacts, and module housing for damage, corrosion, or counterfeit indicators.
- Functional Testing: Where applicable, modules are bench-tested for power-on self-test (POST) pass and basic I/O channel response verification.
- ESD-Safe Packaging: All modules are packed in anti-static bags with foam cushioning and clearly labeled with part number and serial number.
- Documentation: Certificate of conformity and inspection report available upon request.
How to Order
- Submit your inquiry via the Contact / RFQ form on this page with your required quantity and delivery timeline.
- Our technical sales team will respond within 24 business hours with availability, lead time, and a formal quotation.
- Upon PO confirmation, we arrange secure packaging and international freight (DHL / FedEx / UPS / sea freight) with full tracking.
- Export documentation (commercial invoice, packing list, COO) provided for customs clearance.
Why Choose Konmask.com?
- ✅ Industrial Automation Specialists: Focused exclusively on PLC, DCS, and SIS components — not a general electronics distributor.
- ✅ Global Supply Network: Sourcing from verified channels across North America, Europe, and Asia to ensure availability of obsolete and hard-to-find modules.
- ✅ Technical Expertise: Our team includes engineers with hands-on Triconex system experience who can advise on compatibility and replacement options.
- ✅ Fast Response: RFQ responses within 24 hours; urgent orders prioritized.
- ✅ Secure International Shipping: Full export documentation, ESD-safe packaging, and real-time shipment tracking.
- ✅ After-Sales Support: Technical assistance available post-delivery for installation and commissioning queries.
Frequently Asked Questions
Q: Is the TRICONEX AI 3351S2 compatible with the Trident system?
A: The AI 3351S2 is specifically designed for the Tricon TMR chassis. Trident uses a different module form factor and backplane. Please contact us to confirm compatibility with your specific system configuration.
Q: Can the AI 3351S2 be replaced online without shutting down the Tricon system?
A: Yes. The Tricon TMR architecture supports hot-swap module replacement. The remaining two legs maintain safety function during the swap, allowing maintenance without process shutdown.
Q: What input signal types does the AI 3351S2 support?
A: The AI 3351S2 is designed for 4–20 mA current loop inputs, which is the standard signal type for process industry transmitters. Please verify your field device signal type before ordering.
Q: Do you supply new, refurbished, or surplus AI 3351S2 modules?
A: We supply both new and tested-surplus (refurbished) units depending on availability. Condition is clearly stated in the quotation. All units pass our quality inspection process.
Q: How long does international shipping take?
A: Express courier (DHL/FedEx) typically delivers within 3–7 business days to most destinations. Sea freight options are available for larger orders. Lead time is confirmed at quotation stage.
Q: Can you provide a Certificate of Conformity or test report?
A: Yes. Documentation including inspection reports and certificates of conformity are available upon request at time of order.
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