Description
Product Core Summary
- Model: HCU3700 / HCU3703E (3700-3703E)
- Manufacturer: Triconex (Schneider Electric Invensys)
- Core Function: Triple-modular-redundant (TMR) high-density communication processor providing fault-tolerant network and serial connectivity for Tricon safety controllers
- System Compatibility: Fully compatible with Tricon v9, v10, v11 and Trident systems (main chassis only)
- Supply Status: In Stock – Tested & Certified Refurbished / New Surplus Available
- Warranty Standard: 12-month functional warranty, fully tested on live Tricon chassis
Key Technical Specifications
- Product Model: HCU3700 / HCU3703E (3700-3703E)
- Manufacturer: Triconex (Schneider Electric)
- System Platform: Tricon v9–v11, Trident (main chassis only)
- Architecture: Triple Modular Redundant (TMR) with 3 independent legs
- Processor: Three 32-bit RISC processors (one per leg)
- Communication Ports: 4 × 10/100 Mbps Ethernet (RJ45), 4 × RS-232/RS-485 serial ports
- Supported Protocols: Modbus TCP/RTU Master & Slave, OPC DA/AE, Triconex TSAA, Peer-to-Peer, SNTP, DNP3
- Diagnostics: Continuous leg synchronization, hot-swap capable, 100 % fault coverage via TMR voting
- Power Requirements: 24 VDC (±10 %), max 15 W
- Operating Temperature: –20 °C to +70 °C (extended range available)
- Vibration: 2 g @ 10–500 Hz per IEC 61131-2
- MTBF: > 1,200,000 hours (demonstrated)
- Safety Certification: TÜV Rheinland SIL 3 (IEC 61508), AK6, Nuclear IEEE 7-4.3.2 / 603 qualified
- Dimensions (H × W × D): 394 mm × 39 mm × 305 mm (standard Tricon main chassis slot)
- Weight: 2.1 kg
Technical Architecture & Functional Positioning
The HCU3700/3703E occupies the communication layer within the Tricon safety system hierarchy, sitting in the main chassis alongside the Main Processor (MP3008/MP3009) modules. Unlike standard PLC communication cards, it implements full triple-modular-redundant architecture: three identical, isolated processing legs continuously vote on all transmitted and received data frames, ensuring that a single fault cannot corrupt safety-critical messages. This TMR design delivers true fault tolerance rather than simple duplication.
Each leg contains its own CPU, memory, and physical-layer transceivers. Leg synchronization occurs every scan via a dedicated high-speed inter-leg bus, achieving sub-millisecond discrepancy detection. In the event of a detected fault, the faulty leg is automatically isolated while the remaining two continue operation without disturbance to the process or external networks — a capability essential for emergency shutdown (ESD), fire & gas (F&G), and burner management systems (BMS) where communication loss equals loss of view.
The module’s four independent Ethernet ports can be configured for network-isolated or fully redundant (A/B networks), supporting both star and ring topologies with media redundancy protocols. Serial ports maintain legacy connectivity to third-party devices while still benefiting from TMR voting, eliminating single points of failure that plague duplex systems.
Typical Application Scenarios
- Applied in LNG liquefaction trains for integrated ESD and F&G communication to DCS via redundant Modbus TCP
- Deployed in nuclear power plants (1E-class) for safety-grade data exchange between Tricon SIS and plant process computer
- Used in offshore FPSO topside turbo-machinery protection systems requiring simultaneous OPC and peer-to-peer communication
- Serves as direct replacement for obsolete 3700A/3703E in refinery CCR platforms during life-extension projects
- Implemented in pipeline compressor stations for high-integrity pressure protection (HIPPS) with SIL-3 certified DNP3 links
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