Triconex 3721N Analog Input Module

Description

The Triconex 3721N is a high-performance Analog Input (AI) module designed for the Triple Modular Redundant (TMR) safety system. It is specifically engineered to monitor critical analog signals from field sensors, such as pressure, temperature, and flow transmitters. 

Specifications

• Model Number: 3721N
• Input Channels: 32 points, non-isolated
• Signal Range: 0 to 5 VDC
• Resolution: 12-bit
• Input Impedance: >10 Megohms
• Accuracy: < 0.15% of FSR (from 0 to 5 VDC)
• Architecture: TMR (Triple Modular Redundant)
• Update Rate: 10 ms (all 32 channels)
• Safety Integrity Level: SIL 3 certified (IEC 61508)
• Power Dissipation: < 10 Watts

Features

• TMR Architecture: Features three isolated sensing circuits per channel; the module performs hardware voting to eliminate single points of failure and ensure signal integrity.
• Continuous Self-Diagnostics: Executes comprehensive background tests, including "stuck-at" diagnostics and analog-to-digital converter (ADC) verification, without interrupting the process.
• High-Density Monitoring: Supports 32 analog signals in a single module, optimizing chassis space and reducing the overall cost per point for large-scale safety systems.
• Hot-Swappable: Allows for online replacement of the module while the system is energized, maintaining 24/7 protection and preventing costly process interruptions.
• Robust Noise Rejection: Includes advanced filtering and galvanic isolation to protect against electrical interference and common-mode noise in harsh industrial environments.
• TriStation Integration: Fully compatible with TriStation software for simplified calibration, scaling, and diagnostic monitoring of all 32 analog loops.