TRICONEX 3703E 16-Channel Isolated TMR Analog Input Safety Module

Product Description

3703E is a core isolated analog input module of Triconex Tricon SIS safety system under Honeywell (formerly Invensys). It adopts industry-standard TMR triple modular redundant fault-tolerant 

architecture, specially used for collecting voltage analog signals from field pressure, temperature, flow transmitters in high-risk process industries.

Each channel realizes independent point-to-point electrical isolation, supports transparent HART protocol communication with smart instruments, converts analog field signals into digital data and 

uploads to the main safety controller for ESD interlock, over-limit protection and process monitoring. With full coverage self-diagnosis, hot-swap online replacement, conformal coated PCB, 

it is a critical spare part for oil & gas, petrochemical, coal chemical and power plant SIS emergency shutdown systems.

Technical Specifications

Model: 3703E, Brand: Triconex (Honeywell), Origin: USA

Architecture: Triple Modular Redundant (TMR) voting design, SIL3 IEC61508 certified

Channel Quantity: 16 fully isolated differential analog input channels

Supported Input Signals: Configurable 0–5VDC / 0–10VDC; 0–20mA current signal (matched with external shunt resistor)

Resolution: 12-bit high-precision AD conversion

Measurement Accuracy: ＜0.15% full scale range (0℃~60℃ working temperature)

Input Update Cycle: 50ms

Isolation Performance: Per-channel galvanic isolation, common mode rejection ratio ≥-90dB@60Hz, common mode voltage withstand up to 200V peak value

Overvoltage Protection: Continuous withstand 150VDC / 115VAC surge impact

Protocol Support: HART transparent pass-through, Triconex dedicated backplane safety bus

Hot Swap: Support power-off hot plug replacement without system shutdown

Self-Diagnosis Coverage: ＞99.5%, detect open circuit, short circuit, signal over-range, module internal failure

Operating Temperature: -20℃ ~ +60℃ full load operation

Storage Temperature: -40℃ ~ +85℃

Humidity: 5%–95% non-condensing, anti-corrosion conformal coated circuit board

Protection Grade: IP20 (only installed inside control cabinet rack)

Mounting: Standard single slot plug-in for Tricon chassis backplane

Net Weight: Approx. 3.2kg

Certifications: SIL3, FMEDA, CE, UL, CSA, ATEX hazardous area compliance

Core Key Features

TMR triple redundant safety design: Three independent circuit boards perform simultaneous signal sampling and 2-out-of-3 voting logic, eliminate single-point failure risk, fully meet SIL3 safety integrity level requirements for SIS systems.

16-channel full point isolation: Completely block ground loop interference and cross-channel crosstalk, adapt to long-distance field cable transmission and complex EMI workshop environments.

Built-in HART transparent transmission: Directly read instrument internal diagnostic data, device status and fault information without additional HART gateway equipment.

Comprehensive continuous self-diagnosis: Real-time monitor channel wiring breakage, short circuit, signal drift and module hardware abnormality, upload fault alarms to upper SCADA system.

Online hot-swap maintenance: Damaged module can be replaced under system running state, greatly reduce production line stop loss caused by maintenance.

High anti-interference hardware layout: With surge absorption, EMI shielding and filtering circuits, stable operation under strong interference of frequency converters and large motor equipment.

Perfect matching with Tricon controller series: Seamlessly compatible with 8110, 8106, 8105 mainframe racks, one-to-one direct replacement for old 3703E modules.

Strict industrial environmental adaptability: Wide temperature range, anti-vibration coated PCB, long-term reliable 24/7 continuous operation in chemical plant and power station central control rooms.