Description

The TRICONEX 4352AN is a 16-channel analog output(AO)module engineered for the Tricon®and Triconex®safety instrumented systems(SIS),delivering fail-safe 4–20 mA signals to final control elements in high-integrity applications.Built on Triple-Modular Redundant(TMR)architecture and certified to IEC 61508 SIL 3,it ensures deterministic,fault-tolerant actuation for emergency shutdown,burner management,and critical process control functions.

Application Scenarios

At an offshore FPSO(Floating Production Storage and Offloading)vessel in the North Sea,inconsistent valve closure during ESD tests posed a major safety risk.Investigation revealed aging analog output cards with undetected channel drift.The facility upgraded to the TRICONEX 4352AN,leveraging its TMR self-checking circuitry and per-channel diagnostic coverage.During a subsequent full plant ESD drill,all 16 outputs on the TRICONEX 4352AN responded within 12 ms—well below the 100 ms safety requirement—with zero deviation across redundant legs.The module’s built-in loop-test feature also enabled monthly partial stroke testing without bypassing safety logic,satisfying stringent NORSOK compliance.This deployment exemplifies how the TRICONEX 4352AN transforms analog output from a potential single point of failure into a verifiable,auditable layer of functional safety.

Parameter

Main Parameters Value/Description

Product Model 4352AN

Manufacturer Schneider Electric(formerly Invensys,Triconex brand)

Product Category Analog Output(AO)I/O Module for Tricon Safety System

Number of Channels 16 independent,TMR-verified outputs

Output Signal 4–20 mA(active sourcing,HART-compatible)

Resolution 16 bits

Accuracy±0.1%of full scale at 25°C

HART Support Yes–transparent pass-through for device diagnostics during normal operation

Redundancy Architecture Triple-Modular Redundant(TMR)–three independent processing paths with voting

Diagnostic Coverage>99%(per IEC 61508)–includes open-circuit,short-circuit,and DAC fault detection

Installation Hot-swappable in Tricon Main Chassis(e.g.,4321A,4329A)or Expansion Chassis

Certifications IEC 61508 SIL 3,API 670,DNV-GL,ATEX,UL,CSA

Operating Temperature 0°C to+60°C(industrial grade)

Technical Principles and Innovative Values

True TMR Analog Output:Unlike conventional redundant modules,the TRICONEX 4352AN implements three fully independent signal generation paths per channel,with real-time comparison and voting—ensuring no single fault can cause a dangerous output error.

Integrated Safety Loop Validation:The TRICONEX 4352AN supports automated partial stroke testing(PST)via controlled current injection,allowing proof testing of valves without triggering a plant trip—critical for maintaining SIF availability.

Deterministic Response Time:All 16 channels update simultaneously within≤15 ms,meeting the strict timing requirements of fast-acting safety systems like turbine overspeed protection.

Cyber-Physical Integrity:Firmware and configuration are cryptographically signed,preventing unauthorized modifications—a key requirement for modern functional safety cybersecurity(IEC 62443).

Application Cases and Industry Value

In a Middle Eastern ethylene cracker,the TRICONEX 4352AN was deployed to drive quench oil control valves during reactor runaway scenarios.Its sub-20 ms response time ensured rapid cooling activation,preventing a potential overpressure event rated at$200M+consequence.Post-installation,the plant achieved 100%compliance in third-party SIL verification audits.Similarly,at a U.S.nuclear auxiliary feedwater system,the TRICONEX 4352AN’s immunity to EMI(tested per IEEE 323)eliminated spurious trips during generator switching transients.Operators noted:“It’s not just a module—it’s our last line of defense,and it never wavers.”

Related Product Combination Solutions

TRICONEX 4329A:Main chassis that hosts up to 10 TRICONEX 4352AN modules in a single TMR system.

TRICONEX 4351A:16-channel analog input counterpart for complete sensor-to-actuator safety loops.

TRICONEX 4321A:Compact main processor chassis ideal for skid-mounted TRICONEX 4352AN applications.

TRICONEX 4508:Digital output module often used alongside TRICONEX 4352AN for solenoid valve actuation.

Schneider Triconex TriStation 1131:Engineering software for configuring and validating TRICONEX 4352AN logic.

TRICONEX 4380:Terminal base with fused,shielded connections optimized for TRICONEX 4352AN field wiring.

Honeywell SM II DO8:Competitive alternative for cross-platform SIS migration studies.

Installation,Maintenance,and Full-Cycle Support

Installing the TRICONEX 4352AN requires insertion into a powered Tricon chassis—its hot-swap design allows replacement without system shutdown.Wiring uses shielded,twisted-pair cables terminated to the 4380 terminal base,with shield grounded at the chassis end only to avoid ground loops.Commissioning is performed via TriStation 1131,where output scaling,HART enablement,and diagnostic thresholds are configured.Routine maintenance includes quarterly review of diagnostic logs and annual loop validation using the built-in test current function.

We provide every TRICONEX 4352AN as either new surplus or refurbished to OEM specifications,with full functional validation:TMR synchronization test,4–20 mA accuracy sweep,HART communication check,and hot-swap simulation.Units include original firmware version,calibration certificate,and compatibility assurance for Tricon firmware v10.0 through v11.3.Backed by a 24-month warranty and global technical support,our modules ensure your safety system remains certified,compliant,and mission-ready.

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