Triconex 2350

Description

• Manufacturer:​ Triconex (Schneider Electric)
• Product Category:​ TRIDENT Analog Input Baseplate Kit
• Paired TriPak Module:​ Model 3351 Analog Input TriPak
• Architecture:​ Triple Modular Redundant (TMR)
• Safety Integrity Level:​ SIL 3 (as part of the certified TRIDENT SIS)

• Number of Points:​ 32 channels, commoned
• Nominal Input Current:​ 4–20 mA DC
• Operational Current Range:​ 2–22 mA DC
• Absolute Maximum Field Voltage:​ 33 V DC
• Absolute Maximum Reverse Field Voltage:​ –0.6 V DC
• Absolute Maximum Input Current:​ 50 mA DC
• Input Bandwidth (3 dB):​ Documented in TRIDENT manual (see Installation Manual, Page 71)

• Field Short-to-Ground Fault Current:​ 130 mA typical, 200 mA maximum

• Field Power Supply:​ +24 V #1, +24 V #2, 24 V Return, Shield, Safety terminals per point
• Typical Field Wiring:​ 4–20 mA transmitter loop powered from baseplate-provided +24 V field power

Material & Structural Features

• Mechanical Form Factor:​ Standard TRIDENT I/O baseplate dimensions, designed to seat into the TRIDENT main chassis (Model 8110N), expansion chassis (Model 8111N), or remote expansion chassis (Model 8112N)
• Termination Type:​ Screw-clamp field wiring terminals
• Internal Structure:​ Multi-layer printed circuit board with isolated ASIC transceivers, isolation filtering, and triplicated I/O bus interfaces — one set per TMR channel
• Isolation:​ Per-point electrical isolation between field side and logic side via isolated ASIC transceivers
• Keying:​ Mechanically keyed to accept only the correct TriPak type (3351 for analog input baseplates)

Functional Characteristics

• TMR Signal Integrity:​ Each of the three channels reads the field signal independently through its own isolated ASIC transceiver; the TRIDENT main processor performs a majority-vote on the three readings
• Fault Tolerance:​ A single-channel fault is detected, flagged, and bypassed without interrupting the safety function
• Hot-Swap Support:​ The baseplate and its seated TriPak support online replacement (system continues running during maintenance)
• Diagnostic Capability:​ Integrates fault detection for open-loop, short-to-ground, and over-current field conditions
• Field Power Distribution:​ Provides +24 V field power to the connected 4–20 mA transmitters directly from the baseplate terminals

Working Principle

1. Field Signal Arrival:​ A 4–20 mA analog current from a field transmitter enters the baseplate’s screw terminal for a given point.
2. Isolation & Filtering:​ The signal passes through an isolation filter and into an isolated ASIC transceiver dedicated to that TMR channel.
3. Triplicated Bus Transmission:​ Three independent ASIC transceivers (one per TMR leg) forward the digitized signal onto the triplicated I/O bus.
4. Majority Voting:​ The TRIDENT main processor receives three parallel readings and applies a 2-out-of-3 vote to determine the true process value.
5. Fault Handling:​ If one channel’s reading deviates beyond tolerance, that channel is automatically deactivated and flagged for maintenance while the remaining two continue to deliver a valid signal.
6. Short-Circuit Protection:​ In the event of a field short-to-ground, the baseplate limits fault current to 130 mA typical (200 mA maximum), preventing damage to the TriPak and maintaining isolation.

Application Scenarios

• Emergency Shutdown (ESD) Systems​ in oil & gas upstream, midstream, and downstream facilities
• Burner Management Systems (BMS)​ in refineries and petrochemical plants
• Fire & Gas (F&G) Systems​ requiring analog signal acquisition from detectors and transmitters
• Turbine Control & Protection​ in power generation
• Nuclear Safety-Related Applications​ (TRICON/Triden platforms are qualified for nuclear safety-related use per NRC evaluations)
• Process Industries​ requiring SIL 3 certified analog input acquisition: chemicals, LNG, pharmaceuticals, water treatment