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Phone：+86 17062388866Description
The TRICONEX 3721 is a specialized serial communication interface module for TRICONEX V9/V11 safety systems, designed to bridge TMR controllers with legacy DCS, SCADA, and proprietary protocols. As part of Schneider Electric’s Triconex platform, this module enables deterministic data exchange between SIL 3-certified safety logic solvers (e.g., TRICONEX 3625) and external systems using RS-232/RS-485 interfaces. The TRICONEX 3721 supports master/slave communications for protocols like Modbus RTU, facilitating real-time alarm reporting, diagnostic data retrieval, and setpoint synchronization without compromising safety integrity. Its triple-redundant architecture ensures fault-tolerant communication paths – critical for offshore platforms, power generation, and chemical plants where legacy systems coexist with modern safety instrumentation.
TRICONEX 3721
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | TRICONEX 3721 |
| Manufacturer | TRICONEX (Schneider Electric) |
| Product Type | Serial Communication Module |
| Interface Standards | RS-232 / RS-485 (isolated) |
| Protocol Support | Modbus RTU, TriStation Peer Protocol, Custom ASCII |
| Baud Rate | 300–115,200 bps |
| Isolation Voltage | 1500V AC (field-to-system) |
| Safety Rating | Non-SIL (supports SIL 3 system integration) |
| Operating Temperature | -40°C to +70°C |
| Power Consumption | 120 mA @ 5V DC (backplane) |
| Hot-Swap Support | Yes |
| Data Throughput | 9600 bps (typical operational rate) |
| Certifications | ATEX/IECEx Zone 2, UL/cUL Class I Div 2 |
Main Features and Advantages
Legacy System Integration: The TRICONEX 3721 enables seamless connectivity with pre-existing Modbus RTU devices (e.g., flow computers, legacy PLCs), allowing safety systems to ingest process data for advanced interlocks without costly infrastructure upgrades.
Triple-Redundant Design: Three independent serial processors synchronize data streams, with automatic failover if a channel faults – maintaining communication continuity for critical alarm reporting.
Protocol Flexibility: User-configurable for custom ASCII protocols, enabling integration with proprietary DCS (e.g., Bailey INFI-90) and building management systems.
Diagnostic Robustness: Real-time monitoring of signal integrity (parity errors, frame faults) with event logging to TriStation diagnostics. Galvanic isolation prevents ground loops in electrically noisy environments.
Application Field
Oil & Gas: Integrates fire/gas detection panels (Modbus RTU) with TRICONEX 3625 for platform-wide ESD coordination
Power Plants: Bridges turbine vibration monitors (RS-485) to safety controllers for auto-trip logic
Water Treatment: Connects legacy PLC-based chlorine dosing systems to SIL 3 safety interlocks
Pharmaceutical: Links environmental monitoring systems (temperature/humidity sensors) to cleanroom safety shutdowns
Mining: Interfaces ventilation fan controls with emergency stop systems
TRICONEX 3721
Related Products
TRICONEX 3625: Main TMR processor requiring the 3721 for serial integration
TRICONEX 3708EN: Ethernet gateway for modern protocols (OPC UA/Modbus TCP)
TRICONEX 3805E: HART multiplexer for analog field devices
TRICONEX 9721: Serial-to-fiber converter for long-distance communication
TRICONEX 8312: Redundant power supply module
PROSOFT MVI56E-MNET: Modbus interface for Rockwell ControlLogix (alternative for non-safety networks)
