TRICONEX 3721 Analog Input Module (TMR) TRICON3721
TRICONEX 3721 Analog Input Module (TMR) TRICON3721
Technical Specifications
General
Manufacturer: Triconex
Model Number: 3721
Product Type: TMR Analog Input Module
System Platform: Triconex Safety System
Electrical
Number of Inputs: 32 channels
Input Type: Differential, DC-coupled
Input Voltage Range:
0 to 5 VDC
-5 to +5 VDC (±6%)
Performance
Accuracy: < 0.15% of Full Scale Range (FSR)
Operating Temperature Range: 0°C to 60°C
Common-Mode Rejection: -85 dB (DC to 100 Hz)
Architecture & Communication
Redundancy: Triple Modular Redundancy (TMR)
Signal Processing: Three asynchronous measurement paths
Data Transfer: Dedicated I/O bus to associated master
Description
The TRICONEX 3721 Analog Input Module is a high-accuracy Triple Modular Redundancy (TMR) input module designed for use in safety-critical systems, including Safety Instrumented Systems (SIS) and Emergency Shutdown (ESD) applications. Built to deliver reliable signal processing, the TRICON 3721 ensures precise analog measurement and fault-tolerant operation in demanding industrial environments.
This module provides 32 differential, DC-coupled analog input channels and supports voltage ranges of 0 to 5 VDC and -5 to +5 VDC. Three independent input channels measure signals asynchronously, ensuring continuous operation and data integrity even during internal faults. Each channel transfers measured values through its dedicated I/O bus to the main processor for voting and validation.
With excellent measurement accuracy, strong common-mode noise rejection, and seamless integration with the Triconex control platform, the TRICONEX 3721 is ideal for industries where safety, precision, and system availability are essential.
Key Features
Triple Modular Redundancy (TMR) architecture for fault-tolerant operation
32 differential DC-coupled analog input channels
Supports 0–5 VDC and -5 to +5 VDC input ranges
Asynchronous signal measurement across three independent channels
High accuracy with minimal drift over operating temperature range
Excellent common-mode noise rejection
Designed for SIS and ESD systems
Seamless integration with Triconex PLC and CPU modules
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