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Description
Product Overview
Triconex 3481S2 is a high-reliability triple modular redundant (TMR) safety controller of Schneider Electric’s Tricon CX series, specifically designed for safety-critical systems at SIL 3/PLe level. This controller, through hardware-level redundancy and self-diagnosis technology, provides fault-safe control solutions for high-risk industries such as petrochemicals, nuclear power, and thermal power. It is suitable for scenarios such as emergency shutdown systems (ESD) and combustion management systems (BMS).
Feature description
Triple modular redundancy, parallel execution of 3 independent processor channels + 2/3 voting mechanism
In a fail-safe architecture, a single point of failure does not affect system operation, and a double point of failure leads to a safe state
Real-time diagnostic coverage rate >99% hardware diagnostic coverage rate (conforming to IEC 61508 standard)
Hot-swappable maintenance supports online replacement of I/O modules (without downtime)
Network security protection supports firewall /VPN + communication encryption (AES-256)
Technical Specification Sheet
Category parameter
Processing unit
Processor architecture: 3× PowerPC e500v2@800MHz (lockstep operation)
Memory configuration: 512MB DDR3 (per channel) + 128MB Flash
The minimum scanning cycle is 10ms (configurable)
I/O expansion capability
The maximum number of racks is 15 (including the main controller
Local I/O module slot 11 (supports mixed installation)
Remote I/O communication TriStation™ bus (100Mbps) or Ethernet/IP
Communication interface
Control network: 3× 10/100Mbps Ethernet (triple redundancy)
Serial interface 2× RS-232/485 (Modbus RTU protocol)
USB configuration port 1× USB 2.0 (Engineering debugging)
Reliability index
MTBF >100 years (system-level)
Diagnostic coverage rate: 99.8% (processor) / 99.6% (I/O channels)
Fault recovery time <100ms (channel switching)
Environmental adaptability
Operating temperature: -40°C to +70°C
Protection grade: IP20 (frame)/IP65 (Optional reinforced housing)
Anti-electromagnetic interference IEC 61000-4 (Industrial grade 4)
Safety certification and standards
Certification type, standard level
Functional Safety SIL 3 (IEC 61508/61511)/PLe (ISO 13849)
Process Safety API 670 (Mechanical Protection Systems)/NFPA 85/86 (Combustion Safety)
Cybersecurity IEC 62443-3-3 SL2 (Secure Communications)
Industry certification ATEX Zone 2 / DNV GL Maritime certification
Typical application scenarios
Key functions of industry application systems
Overpressure/leakage interlock cut-off for petrochemical emergency shutdown system (ESD)
Thermal power generation Combustion Management System (BMS) Flame detection/fuel safety cut-off
Emergency shutdown of neutron flux in the nuclear power reactor Protection system (RPS)
Pressure transient analysis of long-distance pipeline leakage monitoring system + remote valve shut-off
I/O Module Compatibility (Part
Module type, model example, security level
Digital input 3700E (32 points) SIL 3 (with open circuit/short circuit diagnosis)
Digital output 3805E (16 points) SIL 3 (Independent fuse of output circuit)
Analog input 3503E (8 channels) SIL 3 (±0.1% accuracy)
HART protocol module 4329 supports HART 7.4 signal demodulation
Engineering software ecosystem
• Configuration platform: TriStation™ 1131 (IEC 61131-3 standard)
• Diagnostic tools: Tricon Diagnostics Manager (Real-time Fault Tree Analysis)
• Simulation Test: TriSim™ (Hardware-in-the-loop Test Platform)
• Cybersecurity: CyberSentry™ (Threat Detection and Auditing)
Installation and maintenance requirements
1. Cabinet layout
The distance between the controller and the I/O module should be no less than 100mm (heat dissipation requirement)
• Independent grounding resistance ≤1Ω (grounding wire diameter ≥6mm²)
2. Firmware management
Critical patches must be deployed after being certified by TUV
A full diagnostic test is required for firmware upgrade
3. Spare Parts Strategy
It is recommended to reserve key modules (main processor /I/O interface modules).
• Battery replacement cycle: 5 years (Model: TRICON-BAT)
Precautions
Electromagnetic compatibility
Avoid installing it in the same cabinet as the frequency converter (minimum spacing 300mm)
Signal cables must use twisted-pair shielded wires (with the shielding layer grounded at a single point).
2. Clock synchronization
The IRIG-B input interface (optional module) is used for millisecond-level time synchronization
3. Security Audit
Change records need to be saved to an independent secure storage (SSD).
Declaration: Technical data is based on the Tricon CX v11.3 system manual (Document No. : MMP-0183). The actual performance is subject to the hardware version (3481S2 corresponds to PCB version Rev.D). SIL certification must be implemented in conjunction with certified sensors/actuators.
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