TRICONEX 3721 Safety Controller with 16-Channel Analog Input 4-20mA Signals and 16-Bit ADC Conversion for PLC Interface

1. Product Overview and Technical Specifications​

The 3721 is a high-reliability analog input module designed for critical process control applications requiring precision measurement and fault-tolerant operation. This robust safety system component features a Triple Modular Redundant (TMR) architecture with three isolated input channels per point, providing maximum system integrity and accuracy. Key technical specifications include 16-channel analog input capacity, support for 4-20mA signals, and an operating temperature range from -40°C to +70°C. The module offers high-resolution 16-bit ADC conversion with accuracy within ±0.1% of span and complies with IEC 61508 SIL 3 safety standards. It operates on 24V DC power supply with redundant power input capability and features hot-swappable design for maintenance without system shutdown. The unit incorporates advanced diagnostics with per-channel LED status indicators and supports multiple communication protocols including TriStation and Modbus TCP/IP for seamless integration into modern control systems.

​2. Application Advantages and Functional Benefits​

This analog input module excels in safety-critical applications across oil and gas, chemical processing, and power generation industries where accurate signal acquisition is essential for process safety. The TMR architecture ensures continuous operation even with component failure, while the comprehensive diagnostic coverage enables real-time fault detection and resolution. Key advantages include reduced downtime through online maintenance capability, improved safety integrity with SIL 3 certification, and high measurement accuracy for precise process control. The module's robust design provides immunity to electromagnetic interference and electrical noise, ensuring stable signal acquisition in harsh industrial environments. These features combine to deliver enhanced process safety, reduced lifecycle costs, and compliance with international safety standards while maintaining continuous process monitoring capabilities.

​3. System Integration and Performance Features​

The module offers comprehensive integration capabilities through standardized interfaces and advanced communication protocols. The hot-swappable design allows module replacement during system operation without process interruption, while the built-in diagnostics provide real-time channel-level health monitoring. Key performance features include automatic signal validation, continuous online testing, and event sequence recording for incident analysis. The unit maintains synchronization between all three input channels while executing continuous diagnostics, with automatic compensation for signal drift or degradation. These characteristics, combined with compliance with international safety standards, make the 3721 an ideal solution for modern industrial safety systems requiring high-accuracy signal acquisition, easy integration, and long-term operational stability in demanding applications.

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Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.

With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts.which make sure that all this jobs are

perfectly.

we are major in PLC,Sensors,HIM,Transmitters.

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