TRICONEX 3721 Analog Input Module

TRICONEX 3721 (TMR Safety Instrumented System 32 Channel Analog Input Module)
Brand/Series: TriconeX (Schneider, formerly Envision), Tricon TMR System
Full name: 3721 Differential Analog Input Module
Positioning: SIL3 level Safety Instrumented System (SIS) dedicated AI module, Triple Redundancy (TMR), used for critical condition simulation signal acquisition.

Core parameters (official specifications)
Channel: 32 differential and DC coupled inputs
Signal type:
Voltage: 0-5VDC (unipolar), ± 5VDC (bipolar)
Current: 0-20mA (with an external 250 Ω resistor)
Resolution: 12 bit/14 bit programmable
Accuracy: 0.15% FS (0-60 ° C)
Update rate: 10ms
Common mode rejection: -85dB (DC-100Hz)
Overvoltage protection: 150VDC/115VAC continuous
Isolation: Channel isolation, withstand voltage 1500Vrms
Working temperature: -40 ° C~+60 ° C
Size/Weight: Approximately 408 × 400 × 22mm/2.06kg
Key Features (TMR Security Architecture)
Triple Modular Redundancy (TMR): Three channel independent sampling, three processor majority voting, single channel failure does not affect the system, SIL3 certification.
High reliability acquisition: Temperature, pressure, flow, liquid level and other transmitter signals, 4-20mA mainstream applications.
Strong anti-interference: differential input+high common mode rejection, suitable for strong electromagnetic environments such as power plants, chemicals, oil and gas.
Self diagnosis: Module level/channel level fault diagnosis, real-time reporting, supporting online replacement.
Typical Applications
Industry: Oil and gas, chemical, power (thermal/nuclear power), metallurgy
Scenario: Emergency Shutdown System (ESD), Combustion Safety Management, Critical Unit Protection, SIS Interlocking Control
Model Description
3721: Standard type, 32 channel differential AI, TMR
3721C: Common derivative models, compatible and interchangeable, details differences (such as connectors/coatings)