Triconex AI3351 S2 – 16-Channel Analog Input Module | Tricon Triple Modular Redundancy Platform
The Triconex AI3351 S2 is a high-integrity analog input module engineered for deployment within the Tricon Triple Modular Redundancy (TMR) Safety Instrumented System. Designed to meet the most demanding process safety requirements, this module serves as the primary analog signal acquisition interface in SIL 3-rated safety loops across oil & gas, petrochemical, power generation, and nuclear industries.
As a procurement engineer sourcing safety-critical I/O, the AI3351 S2 delivers the channel density, signal fidelity, and fault-tolerance architecture required to satisfy IEC 61511 functional safety lifecycle requirements without compromise.
Complete Technical Specifications
| Part Number | AI3351 S2 |
| Manufacturer | Triconex (Schneider Electric) |
| Series / Platform | Tricon TMR Safety System |
| Module Type | Analog Input (AI) |
| Channel Count | 16 Channels |
| Input Signal Range | 4–20 mA (current loop), HART protocol support |
| Resolution | 12-bit ADC per channel |
| 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 independent signal paths voted 2oo3 |
| Backplane Interface | Tricon chassis backplane (compatible with 3700 / 3800 series chassis) |
| Operating Temperature | 0°C to +60°C |
| Humidity | 5% to 95% RH, non-condensing |
| Power Consumption | Supplied via chassis backplane |
| Weight | 2,650 g (module + housing) |
| Certifications | TÜV SIL 3, FM, CE, ATEX (zone 2 barrier required) |
| Firmware Compatibility | Tricon v9.x / v10.x; TriStation 1131 programming environment |
Proven Application Environments
- Oil & Gas — Upstream: Wellhead pressure and temperature monitoring in Emergency Shutdown (ESD) systems; integrates with Rosemount 3051 and Yokogawa EJA transmitters via HART.
- Refinery & Petrochemical: Reactor feed flow and temperature acquisition in Burner Management Systems (BMS) and High Integrity Pressure Protection Systems (HIPPS).
- LNG Terminals: Cryogenic temperature loop monitoring with 4–20 mA RTD transmitters; supports continuous online diagnostics without process interruption.
- Power Generation: Turbine vibration and bearing temperature analog acquisition in turbine protection systems; paired with Bently Nevada transmitters.
- Nuclear (Balance of Plant): Coolant flow and pressure monitoring in non-nuclear safety systems; meets IEEE 603 design basis requirements.
- Chemical Processing: Exothermic reactor temperature profiling in Safety Instrumented Functions (SIF) with SIL 3 demand mode requirements.
Engineering Advantages
- True TMR Architecture: Three independent analog-to-digital conversion paths per channel; 2oo3 voting eliminates single-point failures and spurious trips simultaneously.
- Online Replacement (Hot-Swap): Module can be replaced under power without process shutdown — critical for continuous operations with zero-tolerance downtime.
- HART Pass-Through: Supports HART 5/6/7 communication for remote transmitter diagnostics and calibration without breaking the 4–20 mA safety loop.
- Comprehensive Self-Diagnostics: Continuous background diagnostics detect open-circuit, short-circuit, out-of-range, and ADC drift faults; diagnostic coverage >99%.
- Deterministic Scan Time: Fixed 50 ms scan cycle ensures predictable safety response time for SIL 3 SIF calculations.
- Backward Compatibility: Drop-in replacement for AI3351 (non-S2) in existing Tricon chassis with no firmware changes required.
System Architecture & Signal Flow
The AI3351 S2 occupies a standard I/O slot in the Tricon chassis. Each of the 16 field channels is independently wired to the field termination assembly (FTA) via the chassis backplane. The analog signal is simultaneously sampled by three independent microprocessors (Leg A, Leg B, Leg C), each performing its own ADC conversion. The Main Processor Module (MPM) collects all three values and applies 2oo3 voting logic before passing the validated process value to the application program running in TriStation 1131.
HART secondary variable data is extracted by the HART multiplexer and routed to the asset management layer (AMS Device Manager / PACTware) independently of the safety data path, ensuring no interference with SIL 3 integrity.
Sourcing & Quality Verification
- Origin: Genuine Triconex / Schneider Electric manufactured module.
- Inspection Protocol: Each unit undergoes visual inspection, functional power-on test, and channel-level signal verification (4 mA / 12 mA / 20 mA injection) prior to shipment.
- Traceability: Serial number and firmware revision documented; certificate of conformance available on request.
- Packaging: ESD-safe anti-static bag, foam-lined carton; humidity indicator card included.
- Warranty: 12-month warranty against manufacturing defects from date of shipment.
- Lead Time: Ex-stock — typically ships within 2 business days of order confirmation.
Procurement Process
- Submit your RFQ via [email protected] with quantity, required delivery date, and destination port.
- Receive formal quotation with unit price, lead time, and shipping options within 24 hours.
- Issue Purchase Order — we accept T/T, L/C, and PayPal for international transactions.
- Receive packing list, commercial invoice, and test report prior to shipment.
- Track shipment via DHL / FedEx / UPS express or sea freight for bulk orders.
Technical FAQ
Q: Is the AI3351 S2 backward-compatible with the original AI3351?
A: Yes. The S2 revision is a direct drop-in replacement. No chassis modification or firmware update is required. The S2 designation indicates an enhanced diagnostic coverage revision.
Q: Can this module be used in a SIL 2 application?
A: Yes. A SIL 3-rated module can be used in SIL 2 or SIL 1 applications. The higher safety integrity provides additional margin and simplifies the safety case documentation.
Q: Does the AI3351 S2 support HART 7?
A: HART 5, 6, and 7 are all supported via the HART pass-through function. Confirm your Tricon firmware version (v9.6+ recommended for HART 7 full support).
Q: What FTA (Field Termination Assembly) is required?
A: The AI3351 S2 is compatible with the Triconex FTA-AI-16 (part no. 4000093-001 or equivalent). Confirm chassis slot assignment with your Tricon system engineer.
Q: Can Konmask provide a test report for this module?
A: Yes. A functional test report with channel-level verification data is available upon request at no additional charge.
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