TRICONEX 3721 high-performance differential analog input module

The TRICONEX 3721 is a high-performance differential analog input module and an integral part of the Triconex Safety Instrumented System (SIS). Below is its comprehensive detailed information:

1. Technical Parameters

Number of Input Points: 32 differential analog input points
Input Voltage Range: 0–5V DC or -5 to +5V DC
Input Update Rate: 10ms
Resolution: 12-bit or 14-bit programmable resolution
Accuracy: Less than ±0.15% of Full Scale Range (FSR) at 0°C to 60°C
Common Mode Rejection Ratio (CMRR): Minimum 85dB (DC–100Hz)
Input Overvoltage Protection: Capable of withstanding continuous overvoltage of 150V DC / 115V AC
Operating Temperature: -20°C to +60°C
Mounting Method: Inserted into standard Triconex chassis slots

2. Product Features

High Reliability: Adopts a Triple Modular Redundancy (TMR) architecture. The module integrates three completely independent input channels, and the main processor selects the most reliable value for processing through a median selection algorithm. Even if one channel fails, the entire module can still work normally, meeting the SIL 3 Safety Integrity Level.
High Precision: Supports high-resolution analog signal acquisition, with a maximum programmable resolution of 14 bits. It can capture more subtle signal changes to ensure data accuracy.
Strong Anti-Interference Ability: The differential input design and high common mode rejection ratio effectively filter out common-mode noise. The input overvoltage protection design can resist accidental voltage surges, enhancing the module’s durability and long-term stability.
Easy Maintenance: Supports hot-swapping, allowing on-line replacement during system operation without shutdown. The module has a built-in continuous self-diagnostic function that can real-time monitor its own health status. When an abnormality is detected, it will immediately issue a prompt through status indicators and system alarms.

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