Triconex 3401 / DO3401 | Full Version Chinese and English Introduction ## 1. Product Introduction 3401 (DO3401) is a TMR triple modular redundant digital output module of Schneider Triconex Trident series SIS safety system. Rated at SIL3, it transmits 24VDC switching signals to drive solenoid valves, emergency shutdown valves, relays, audible and visual alarms as well as interlocking equipment, and is widely applied in ESD / BMS / F&G safety interlock systems. 3401 (DO3401) is a TMR triple modular redundant digital output module for Schneider Triconex Trident SIS system. With SIL3 certification, it outputs 24VDC discrete signals to drive solenoid valves, shutdown valves, relays, alarms and interlock devices, widely used in ESD, BMS and F&G safety systems. ## 2. Main Specifications Module Model: DO3401 Channel Quantity: 16-channel isolated digital output Rated Voltage: 24 VDC (Range: 18～30 VDC) Output Load: Single Channel Continuous Current: 1.5 A Peak Current: 4.8 A Architecture: TMR triple modular redundancy, 2oo3 two-out-of-three hardware voting Safety Level: SIL 3 / IEC 61508 Electrical Isolation: Isolation between field side and system side, with 1500 VAC withstand voltage Self-diagnosis: Detection of overcurrent, short circuit, open circuit and loop faults Ambient Temperature: -40℃ ～ +70℃ Maintenance Feature: Hot-swappable and online replaceable ## 3. Key Features Adopts triple independent circuit operation and voting, preventing tripping and misoperation under single-point failure Supports full-channel real-time diagnosis and rapid fault reporting for convenient operation and maintenance Features industrial wide temperature adaptability and strong anti-interference capability, suitable for harsh working conditions in chemical, power, oil and gas industries Adopts fail-safe design to meet the requirements of process safety shutdown Seamlessly compatible and combinable with Trident 3101 main controller, DI3301 and AI3351 modules for integrated application Triple independent circuit voting, no false trip under single failure Full-channel real-time diagnostics for fast fault locating Wide temperature and high EMC resistance for harsh industrial sites Fail-safe design to ensure process safety Perfect matching with Trident series CPU and I/O modules ## 4. Application Scope ✅ Emergency Shutdown System (ESD) ✅ Boiler Management System (BMS) ✅ Fire & Gas Detection System (F&G) ✅ Plant interlock shutdown, equipment protection and valve control