Description
Technical Specifications
- Product Model: 3501TN2
- Brand: TRICONEX
- Warranty: One Year
- Input Voltage: 115 V AC/DC (wide-range field interface)
- Operating Temperature: 0°C to +60°C
- Storage Temperature: -40°C to +85°C
- Response Time: <5 ms ON/OFF detection
- Protection Class: IP20
- Accuracy Class: SIL 3 certified enhanced digital input
- Output Frequency: N/A (digital input)
- Rated Current Range: 5-15 mA per point; opto-isolated
- Communication Interface: Tricon backplane; external termination panels
- Supported Protocols: TMR voting integration
- Overload Capacity: 1500 V isolation; surge protection
- Dimensions: Rack module; ≈0.8 kg
Product Overview
The TRICONEX 3501TN2 is an enhanced main chassis digital input module for Tricon safety systems, interfacing 115 V AC/DC field devices like high-voltage relays, status contacts, and interlocks in SIL 3 ESD and Fire & Gas applications. Building on standard 3501TN design, the “enhanced” variant adds advanced diagnostics, improved noise rejection, and hot replacement capability for maximum availability. Oil & gas, power, and chemical engineers use it where legacy 115 V field wiring meets modern TMR safety requirements, converting high-voltage discrete signals into voted digital states for main processors. Opto-isolated inputs with rugged construction handle industrial noise environments, while comprehensive status LEDs (PASS/FAULT/ACTIVE) enable rapid troubleshooting. Designed for Tricon v9-v11 chassis, it consolidates high-voltage monitoring without voltage conversion panels, reducing marshalling complexity in control rooms with mixed-voltage architectures. (152 words)
Key Functions
High-Voltage Field Interface
Direct 115 V AC/DC input eliminates step-down transformers; wide-range tolerance handles industrial supply variations without false triggering.
Enhanced Diagnostics
Advanced fault detection beyond basic open/short monitoring; reports marginal contacts and noise conditions to Tricon event logger for predictive maintenance.
TMR Voting Integration
Three independent input paths feed 2oo3 voting to main processors; single channel faults auto-isolate while maintaining SIL 3 dangerous failure rates.
Hot Replacement Support
Online module swap during operation; bumpless transfer preserves input states during maintenance without safety compromise.
Application Scenarios
Legacy DCS High-Voltage Contacts
Refineries interface existing 115 VAC annunciator relays and breaker status into TMR ESD logic; eliminates conversion panels while adding diagnostics.
Power Plant 115 VDC Station Battery
Monitors battery-powered lockout relays and protection schemes; wide-range tolerance handles charger float/equalize voltage swings.
Chemical Plant Interlock Relays
Tracks high-energy contactors and solenoid status; enhanced noise rejection prevents EMI false inputs in motor control centers.
Offshore Platform Legacy Wiring
Consolidates 115 VAC fire panel contacts into Tricon F&G; hot-swap capability supports maintenance during continuous operations.
