TRICONEX 3721 Analog Input Module | Triple Redundancy Architecture SIL 3 Certified High-precision Data Acquisition Solution for Industrial Automation

TRICONEX 3721 is a Triple Redundancy (TMR) analog input module under Emerson. It supports the acquisition of 32 channels of differential signals, with a resolution adjustable in 12/14 bits and has passed SIL 3 certification. It is applicable to scenarios such as petrochemicals and power, and features hot plugging, real-time diagnosis and multi-protocol communication capabilities. Check the technical parameters and solutions.

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TRICONEX 3721 Analog input Module: An industrial-grade high-precision data acquisition solution under a triple redundancy architecture

The TRICONEX 3721 is a high-reliability Triple Modular Redundancy (TMR) analog input module from Emerson, engineered to deliver precise and fault-tolerant signal acquisition in safety-critical industrial environments. With 32 differential input channels, 12/14-bit programmable resolution, and SIL 3 certification (IEC 61508), it ensures accurate monitoring of analog signals like temperature, pressure, and flow in industries such as petrochemicals, power generation, and smart manufacturing.

Technical Specifications & Core Features

1. Triple Modular Redundancy (TMR) Architecture

• Three independent signal processing channels with real-time voting ensure no single point of failure.
• Majority Vote mechanism eliminates faulty signals, achieving 99.999% system availability.
• Compliant with ISA 84.00.01 and IEC 61511 for safety instrumented systems.

2. Signal Acquisition & Processing

3. Operational Resilience

• Temperature Range: -40°C to +70°C (EN 50155 compliant for rail).
• EMC/EMI Protection: Meets IEC 61000-4 standards for electromagnetic compatibility.
• Hot-Swap Capability: Full-module hot-swapping with live diagnostics.

Applications in Critical Industries

1. Oil & Gas Refineries

• Monitors analog signals from pressure transmitters, temperature sensors, and flow meters in SIS systems.
• Case Study: A Gulf Coast refinery reduced signal errors by 92% using TRICONEX 3721, leading to 20% fewer unplanned shutdowns.

2. Power Generation

• Integrates with turbine control systems to measure vibration (±5V signals) and temperature (RTD inputs).
• Used in smart grids to monitor grid voltage and current with 0.15% FSR accuracy.

3. Manufacturing & Automation

• Supports robotic assembly lines by acquiring force sensor data (0-10V) for precision control.

• Result: A automotive plant achieved ±0.05mm positioning accuracy in robotic welding processes.

  
  

  
  

3721 pdf data sheet & document、Manual

Version and firmware

3721 -A

3721-B

3721-C

3721-D

3721-F

3721 -V1.x.x

3721-V2.x.x

3721-V3.x.x

3721-V4.x.x

3721-V5.x.x..or higher

Customer Success Story

• Challenge: Unreliable analog modules caused 15% production rejects due to signal drift.
• Solution: Deployed TRICONEX 3721 with 14-bit resolution and TMR redundancy.
• Results:
• 0% signal-related rejects in 18 months.
• 30% faster fault detection via module-level diagnostics.
• Achieved SIL 3 re-certification with minimal engineering effort.

Contact us immediately:

Spot supply: Genuine TRICONEX 3721, with a one-year warranty

Market price: 3000 US dollars - 3500 US dollars

Technical services: Provide domestic configuration solutions, system integration and debugging, and 24-hour online technical support.

Contact information:

Sales Manager: Li Ming

WHATSAPP:+86 18059884790

Email:plc66@qq.com

Related resources

Download Center: Click to obtain the  datasheet TRICON 3721.pdf

Knowledge Popularization: How to Choose a Redundant Architecture for Industrial Controllers?

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