The Triconex 3708EN is a high-performance safety logic solver based on Triple Modular Redundancy (TMR) architecture. Designed for Safety Instrumented Systems (SIS), it executes safety logic with maximum reliability for emergency shutdown, fire & gas, and critical process control applications in oil & gas, chemical, and power industries.
TRICONEX 3708EN Controller Module
Product Introduction: The Triconex 3708EN is a high-performance safety logic solver based on Triple Modular Redundancy (TMR) architecture. Designed for Safety Instrumented Systems (SIS), it executes safety logic with maximum reliability for emergency shutdown, fire & gas, and critical process control applications in oil & gas, chemical, and power industries.
Safety Logic Solving Function
The Triconex 3708EN serves as the central intelligence unit in a Safety Instrumented System (SIS), responsible for executing safety logic that protects people, assets, and the environment. Unlike standard process controllers that optimize operations, this safety controller is dedicated to taking predefined safety actions when process conditions exceed safe limits. It continuously monitors inputs from safety field devices (via I/O modules), processes this information according to pre-programmed safety logic, and commands final elements (valves, breakers, etc.) to move processes to a safe state when necessary. The controller's primary design objective is maximum reliability - it must neither fail to act when required (dangerous failure) nor act when not required (spurious trip). This balance between safety availability and safety integrity makes it suitable for the most critical safety applications.
Triple Modular Redundancy (TMR) Technology
The 3708EN's core innovation is its Triple Modular Redundancy (TMR) architecture. The controller contains three independent, identical processing channels operating in parallel. Each channel has its own processor, memory, and I/O communication. All three channels execute identical application logic simultaneously. A sophisticated hardware and software voting system compares the outputs of all three channels. The system only produces an output when at least two of the three channels agree (2-out-of-3 voting). This architecture provides continuous fault tolerance - if one channel fails, the system continues to operate correctly while diagnosing the fault. The TMR design effectively addresses both random hardware failures and certain systematic failures, providing an optimal balance between high safety integrity and high availability for safety-critical applications.
Technical Specifications
Controller Architecture
Model: Triconex 3708EN Safety Controller
Architecture: Triple Modular Redundancy (TMR)
Voting Scheme: 2-out-of-3 (2oo3) voting on inputs, logic, and outputs
Safety Standards: IEC 61508 certified for SIL 3 applications
Diagnostic Coverage: >99% diagnostic coverage for dangerous failures
Performance Specifications
Processing Speed: High-speed processing suitable for rapid safety response
Memory Capacity: Ample memory for complex safety logic and data storage
I/O Capacity: Supports extensive I/O points through expansion
Scan Time: Deterministic scan time for predictable performance
Communication: Multiple communication ports for system integration
Physical & Environmental
Mounting: Installs in Triconex chassis with redundant power supplies
Operating Temperature: Industrial temperature range for harsh environments
Certifications: ATEX, IECEx, UL, CSA for hazardous areas
Hardware Fault Tolerance: HFT=1 as per IEC 61508
Mean Time To Failure (MTTF): High MTTF contributing to low PFD
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