The TRICONEX 3721 Analog Input Module is a high-performance, reliable device designed for industrial control and monitoring applications.
- Wide Input Range：It supports a voltage input range of 0 to 5 VDC or -5 to +5 VDC with a +6%tolerance34. This wide range allows it to handle various analog signals from different industrial sensors and devices.
- High Channel Capacity：Equipped with 32 differential, DC-coupled input points34. It can simultaneously monitor a large number of analog signals, providing comprehensive data acquisition for complex industrial processes.
- Fast Update Rate：The input update rate is 10 ms34. It can quickly capture and process changes in analog signals, ensuring timely response and control in real-time applications.
- Programmable Resolution：The resolution is programmable at 12 bits or 14 bits34. Users can adjust the resolution according to specific accuracy requirements, offering flexibility in different measurement scenarios.
- High Accuracy：With an accuracy of less than 0.15% of FSR (Full Scale Range) from 0°C to 60°C34, it guarantees precise measurement and reliable data, which is crucial for maintaining the quality and safety of industrial operations.
- Excellent Electrical Characteristics4：It has a common mode rejection of -85 dB (DC - 100 Hz), an input resistance (load) of ≥10 MΩ (DC) minimum, and a power-off resistance of ≥140 kΩ (DC) typical. The leg-to-leg isolation is 420 kΩ typical, effectively preventing signal interference between channels.
- Strong Overrange Protection：Capable of withstanding 150 VDC/115 VAC continuous input overrange voltage34. This protection feature enhances the module's stability and reliability, reducing the risk of damage from unexpected voltage surges.
- TMR Technology：Based on Triple Modular Redundancy (TMR) technology, it uses three identical modules to work in parallel, comparing and verifying data to improve system reliability and fault tolerance14.
Comprehensive Diagnostic Functions：It is equipped with PASS, FAULT, ACTIVE, and FIELD diagnostic indicators4. These indicators can intuitively display the working status of the module, facilitating quick fault diagnosis and maintenance by technicians.
TRICONEX 3721 Analog Input Module
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Triconex / Tricon 安全系统
-Foxboro IA DCS 系统。
The Triconex system usually consists of the following typical modules:
Main Processor modules (triple).
Communication module(s) .
Input and output modules: can be analog and/or digital and work singular or in hot-spare (standby).
Power supply modules (redundant).
Backplane(s) (chassis) that can hold the previous modules.
System cabinet(s): can compact one or more chassis in one cabinet.
Marshalling cabinets to adapt and standardize interface connections between the field instruments and the Triconex system cabinets.
Human machine interface (HMI) to monitor the events.
Engineering workstation (EWS) for programming. monitoring, troubleshooting and updating.
The Triconex main processors can communicate with the so-called TriStation 1131 application software to download, update and/or monitor programs. These programs are either written in:
Function Block Diagram language,
Ladder diagram language, or
Structured text (Pascal like) Language.
Cause and Effect Matrix Programmable Language (CEMPLE).
Besides, a Sequence of Events (SOE) recorder software and Diagnostic monitor software are implemented.
Industries
Refining and petrochemicals
Upstream and midstream oil and gas
Chemicals and specialty chemical
Power generation
Pharmaceuticals
Safety and critical control applications
TÜV-certified for SIL 3 applications to international standard IEC61508: 2010
– Emergency shutdown systems (ESD control)
– Fire and gas systems (F&G control)
– Burner management systems (BMS controls)
– High-integrity pressure protection systems (HIPPS control)
– Turbomachinery control (TMC) and protection systems
Works in both centralized plus distributed and remote I/O applications
Suitable for use in harsh environments
The following models are associated with the TRICONEX 3721 analog input module:
3701: Analog input module, input range 0-10Vdc.
3703E: Analog input module, input range is 0-5V, 0-10Vdc.
3704E: Analog input module with optional input voltage 0-5V or 0-10V via TriStation software.
3706A: NITC input module for thermocouple analog input.
3708E: ITC thermocouple analog input module.
3720: Analog input module similar to 3721, with isolation points, in yellow.
3722X: Analog input module, input range 0-5Vdc.
3723X: Analog input module, input range 0-5Vdc, with Hart protocol.
In addition, there are DC analog input modules such as 3805E/H, and the AI3351 module related to analog input (supporting MTL4850 and AI2354A baseboards).
The TRICONEX 3721C is part of the Triconex Safety Instrumentation System (SIS), which converts analog signals to safe digital signals. Compared with the 3721 module, the 3721C is different in some parameters, such as the input channel is 16, and the input range is -200mA to 200mA
