Description

TRICONEX 3721 is a high-performance differential analog input module,belonging to the Triconex safety system of TRICONEX company.This system is recognized as the industry-leading TMR(Triple Modular Redundancy)Safety Instrumented System(SIS)under Schneider Electric.The Triconex 3721 module is designed for industrial applications that require high precision,reliability,and safety.It is capable of receiving signals from various differential analog sensors on site,such as temperature,pressure,liquid level,and flow transmitters,and converting these signals into digital data that can be processed by the Triconex system for safety monitoring and control.The TRICONEX 3721 module adopts a Triple Modular Redundancy(TMR)architecture,where each input channel is processed in parallel by three completely independent circuits and real-time median selection is performed,thereby eliminating the possibility of single point failures and ensuring extremely high system availability and safety.In addition,the TRICONEX 3721 module also has comprehensive onboard diagnostic functions,which can monitor the operating status of the module and input channels in real time,report any potential faults in a timely manner,and further enhance the safety and maintainability of the system.Thanks to its excellent fault tolerance and high-precision signal acquisition,TRICONEX 3721 has been widely used in high-risk industries such as oil and gas,chemical,and power,and is a key component in building SIL 3 safety level control systems.

3721 TRICONEX

technical specifications

Product Model:3721

manufacturer:TRICONEX(Schneider Electric)

Product type:TMR differential analog input module

Series:Triconex Security System

Number of input channels:16(triple modular redundancy)

Input Type:Differential Analog Input

Input signal range:±10V,±5V,0-10V,0-5V,4-20mA(configurable)

Resolution:16 bits

Accuracy:±0.05%full scale(typical value)

Sampling rate:Each channel samples independently

Common mode rejection ratio(CMRR):>;120 dB

Isolation voltage:500 VDC(channel to system)

Hot plug support:Supports

Onboard diagnosis:channel open/short circuit detection,hardware fault detection

Safety certification:TÜV certification IEC 61508 SIL 3

Working temperature:-40°C to+70°C

Weight:Approximately 1.5 kg

Main features and advantages

The core advantage of the TRICONEX 3721 differential analog input module lies in its excellent safety,reliability,and accuracy.The Triple Modular Redundancy(TMR)architecture is the cornerstone of its high reliability,with each input channel consisting of three independent analog input circuits.Real time median selection ensures that even if one circuit fails,the module can still provide the correct output,eliminating single point failures and ensuring the continuous safe operation of the system.The TRICONEX 3721 module provides 16 high-precision differential analog input channels,which can accurately measure the output signals of various industrial sensors,ensuring that the control system can obtain accurate process data and achieve precise safety control.

Enhanced Safety:The TRICONEX 3721 has been certified by TÜV and meets the safety level requirements of IEC 61508 SIL 3.It is suitable for various safety critical applications and provides the highest level of assurance for the safe operation of factories.Its comprehensive onboard diagnostic function can monitor the status of channels and modules in real time,detect and report potential faults in a timely manner,further enhancing the safety of the system.

High precision measurement:The TRICONEX 3721 module has a high resolution of 16 bits and a typical accuracy of±0.05%,which can provide very accurate analog signal acquisition and meet the high demand for measurement accuracy in industrial applications.Its excellent common mode rejection ratio can effectively suppress common mode interference,ensuring the purity of signal acquisition.

Flexible input configuration:The TRICONEX 3721 module supports multiple commonly used analog input signal ranges,including voltage and current signals.Users can flexibly configure according to the type and output range of on-site sensors,improving the adaptability of the system.

Easy to maintain:The TRICONEX 3721 supports hot swappable functionality,allowing for safe module replacement during system operation without the need for downtime,minimizing production interruptions to the greatest extent possible.The onboard diagnostic function also facilitates users to quickly locate and troubleshoot faults.

3721 TRICONEX

application area

The TRICONEX 3721 differential analog input module is widely used in industrial fields with the highest requirements for safety and availability due to its excellent safety,reliability,and accuracy.In the oil and gas industry,it is used for emergency shutdown systems(ESD),flame and gas detection systems(F&G),and critical process variable monitoring,such as precise measurement of pressure,temperature,liquid level,and flow,providing a reliable data foundation for safety interlock and protection functions.In the chemical industry,TRICONEX 3721 is used for analog signal acquisition in safety critical processes,ensuring that the production process operates within safe parameter ranges.In the power industry,this module can be used for safety protection systems of key facilities such as nuclear power plants and thermal power plants.In addition,TRICONEX 3721 is also suitable for other applications that require SIL 3 safety level and high-precision analog input,such as pharmaceuticals and metallurgy,providing solid security guarantees for these key industries.

Related products

The products related to Triconex 3721 include other TMR modules of the Triconex safety system,such as 3701E TMR analog output module,3501E TMR digital input module,3604E TMR digital output module,and 3008 TMR main processor,which together build a complete TMR safety control system.Triconex Communication Modules,such as 4351B,are used for secure or non secure communication with other automation systems.Triconex Power Modules provide redundant power to the system.In addition,Schneider Electric also provides TriStation NX safety configuration software for configuring and managing the Triconex system.

Preparation before installation:Before installing the Triconex 3721 differential analog input module,please refer to the relevant installation manual and safety guide of the Triconex safety system.Ensure that the installation environment meets the working temperature and humidity requirements of the module,and has good ventilation conditions.Check if the appearance of the module is intact and if the connectors are clean.According to the system design and wiring diagram,carefully plan the wiring method of the on-site differential analog sensor,and ensure good shielding and grounding of the signal line.Before making any hardware connections,be sure to disconnect the system power and take necessary electrostatic protection measures.Insert the TriconeX 3721 module correctly into the I/O socket of the Triconex controller and tighten the fixing screws with the correct torque.

Maintenance suggestion:To ensure the long-term stable operation of the TRICONEX 3721 differential analog input module,it is recommended to perform regular maintenance.Regularly check if the module is securely connected to the socket.Keep the interior of the control cabinet clean to prevent dust accumulation from affecting the module’s heat dissipation and performance.Regularly check whether the connection between on-site sensors and signal lines is good,and whether the shielding layer is reliably grounded.It is recommended to conduct regular system checks and hardware diagnostics according to the maintenance manual of the Triconex security system,including checking the status indicator lights of modules and conducting regular functional tests to verify the accuracy of analog input signals and the effectiveness of diagnostic functions.Due to its redundant design,it is recommended to regularly calibrate and perform functional testing on each channel,if conditions permit,to verify its fault tolerance.

3721 TRICONEX

Product Guarantee

Schneider Electric provides comprehensive product assurance for the 3721 differential analog input module.All products undergo strict quality inspection and performance testing to ensure compliance with relevant industrial standards and safety regulations.