Triconex 3351S2

Triconex 3351S2

Product Introduction: The Triconex 3351S2 is a triple-redundant analog input module designed for the Trident safety system, used to acquire analog signals such as 4–20 mA from transmitters and sensors. It provides high-integrity, fault-tolerant measurement for safety and critical control loops, achieving SIL3 when integrated within a Trident TMR architecture.

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Category: SKU: Triconex 3351S2

Description

Triconex 3351S2

Technical Specifications:

  • Type: Triple-redundant analog input module (32 channels, common reference)
  • Input Signal: 4–20 mA nominal; operating range typically 2–22 mA
  • Accuracy: High precision (per datasheet; typical <0.25% FSR)
  • Diagnostic Coverage: Per-channel diagnostics for open/short and out-of-range
  • Isolation: Channel-to-channel and channel-to-ground isolation
  • Operating Temperature: 40 °C to +70 °C
  • Mounting: Trident chassis slot with hot-swap capability

Functional Features:

  • Three independent acquisition paths per channel with mid-value selection
  • Continuous self-test and diagnostics for each channel
  • Support for HART pass-through on selected variants (check model specifics)
  • High common-mode noise rejection and accuracy

Application Scenarios:

  • Process variable monitoring for safety trips (pressure, temperature, level, flow)
  • High-integrity protection systems (HIPPS) analog measurements
  • Critical control loops within SIS

Performance Parameters:

  • 16-bit resolution or higher per channel
  • Low drift and high accuracy across temperature range

Material and Structural Characteristics:

  • Industrial-grade PCB with isolated analog front ends
  • Trident front panel with status LEDs and keyed connector
  • Rugged design conforming to Trident mechanical standards

Working Principle: Each analog input is sampled by three independent A/D converters. The module performs mid-value selection and voting to ensure valid measurement despite a single fault. Diagnostics continuously monitor input integrity and report faults. Installation Requirements:

  • Insert into designated Trident I/O chassis slot
  • Connect field devices to the corresponding field termination assembly
  • Configure input ranges and alarms via TriStation software
  • Verify calibration and wiring during commissioning

Usage Notes:

  • Ensure field device compliance with loop power requirements
  • Use twisted, shielded pair wiring for analog signals; avoid running signal cables near power cables
  • Follow calibration and testing schedules to maintain SIL3 performance

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