Triconex 3721 Analog Input Module | 32-Channel TMR

Triconex 3721 Analog Input Module Overview

The 3721 Analog Input Module from Triconex delivers high-performance signal acquisition for critical control systems. This 32-channel module provides exceptional accuracy and reliability in demanding industrial environments. The 3721 module features Triple Modular Redundant (TMR) architecture for maximum system availability.

Key Technical Specifications

• Manufacturer: Triconex | Model: 3721 Analog Input Module
• Input Voltage Range: 0 to 5 VDC or -5 to +5 VDC with ±6% tolerance
• Input Channels: 32 differential, DC-coupled points with full isolation
• Input Update Rate: 10 milliseconds for real-time data acquisition
• Programmable Resolution: 12 bits or 14 bits for flexible accuracy needs
• Accuracy: Better than 0.15% of Full Scale Range from 0° to 60° C

Electrical Characteristics

• Input Resistance: 10 MΩ (DC) minimum for minimal loading
• Common Mode Rejection: -85 dB (DC to 100 Hz) for noise immunity
• Common Mode Range: -12V to +12V peak for wide signal tolerance
• Input Overrange Protection: 150 VDC/115 VAC continuous protection
• Leg-to-Leg Isolation: 420 kΩ typical for channel separation

Signal Processing Features

• Normal Mode Rejection: -3 dB @ 23 Hz, -8 dB @ 60 Hz, -14 dB @ 120 Hz
• Current Range Support: 0-20 mA with 250 Ω shunt resistor option
• Power-Off Resistance: 140 kΩ (DC) typical for safety isolation
• Module Weight: 1.36 kg for compact system integration
• Diagnostic Indicators: PASS, FAULT, ACTIVE, FIELD status monitoring

Frequently Asked Questions

• How many input channels does the 3721 have? 32 differential channels
• What voltage ranges does it support? 0-5 VDC or ±5 VDC ranges
• What is the update rate? 10 milliseconds for all 32 channels
• What resolution options are available? Programmable 12-bit or 14-bit
• Is overvoltage protection included? Yes, 150 VDC continuous protection