TRICONEX 2351 Logic Solver Module – Redundant Architecture, Ensuring Industrial Safety at Every Level!

Description

The TRICONEX 2351 is a highly specialized and critical 16-Channel Analog Output Module designed exclusively for use within the renowned Tricon v9, v10, and v11 safety instrumented systems (SIS). As a core component of the world’s most trusted triple modular redundant (TMR) architecture, the 2351 module is engineered to convert digital control signals from the main processor into precise, isolated analog output signals (4-20 mA or 0-5 VDC) to command final control elements in the field. Its primary role is to execute safety-critical actions, such as opening or closing valves or regulating speed setpoints, with absolute certainty and fault tolerance. The module’s design philosophy centers on achieving maximum availability and fail-safe operation, ensuring that no single point of failure can prevent a safe shutdown of the process it protects.

The TRICONEX 2351 module embodies the core principles of the Tricon system by incorporating three independent internal channels. Each channel performs its own signal conversion, and the results are voted on at the output stage. This sophisticated TMR design, combined with comprehensive diagnostics, ensures that both random hardware failures and systematic faults are detected and managed without compromising the integrity of the safety function. The module is hot-swappable, allowing for replacement without the need to power down the entire Tricon system, a vital feature for maintaining continuous process uptime. Deploying the TRICONEX 2351 provides engineers with the confidence that their critical control outputs are handled by a module with a proven history of reliability and certified performance up to Safety Integrity Level (SIL) 3.

2351 TRICONEX

Technical Specifications

Main Features and Advantages

The TRICONEX 2351 offers a suite of features that make it the preferred choice for critical analog output applications. Its most significant advantage is its Triple Modular Redundant design. Each of the 16 output channels is physically implemented with three isolated circuits. The three output values are voted upon internally, and a single, correct analog signal is sent to the field device. This architecture ensures continuous, accurate operation even if a fault occurs in one of the three internal channels, guaranteeing that the safety function is maintained without spurious trips.

Unmatched Diagnostic Capabilities: The module performs continuous, built-in diagnostics to monitor its health and the integrity of the field wiring and connected devices. It can detect critical faults such as open circuits, short circuits, and over-range or under-range conditions. Any detected fault is immediately reported to the main processor and can be programmed to drive the output to a predefined safe state (0 mA, 20 mA, or hold last value), a fundamental requirement for fail-safe design.

Enhanced Operational Flexibility and Uptime: The 2351 is designed for maximum operational efficiency. Its hot-swappable capability allows technicians to remove and replace a faulty module without interrupting the operation of the other modules in the chassis or taking the entire safety system offline. This drastically reduces mean time to repair (MTTR) and supports higher overall plant availability. Furthermore, each channel is individually configurable for current or voltage mode, providing exceptional flexibility to interface with a wide array of final control elements from different manufacturers.

Application Field

The TRICONEX 2351 is deployed in industries where process safety is non-negotiable and the failure of a control output could lead to catastrophic consequences. In the Oil & Gas sector, the 2351 is fundamental within Emergency Shutdown (ESD) and Fire & Gas (F&G) systems on offshore platforms, refineries, and pipelines. It is used to command emergency shutdown valves (ESDVs) to isolate sections of a process, control blowdown valves to depressurize equipment, and manage critical pump and compressor systems to safely shut down during a detected hazard.

Within the Power Generation industry, particularly in gas turbine and boiler control systems, the TRICONEX 2351 module plays a vital role in turbine emergency overspeed protection and burner management systems (BMS). It sends precise signals to control fuel valves, ensuring a safe and controlled shutdown in the event of an unsafe condition. The chemical and pharmaceutical industries also rely heavily on the 2351 for their process shutdown systems to mitigate risks associated with high pressure, high temperature, or runaway reactions, ensuring the protection of personnel, assets, and the environment. Its SIL 3 certification makes it suitable for the most demanding safety applications across these critical infrastructures.

2351 TRICONEX

Related Products

3503E: A newer generation, enhanced analog output module offering higher channel density and improved performance for modern Tricon systems.

4351B: A similar 16-channel analog output module designed for the older Tricon v8. x system platform.

3008: Analog Input Module, a complementary module used to bring field sensor signals (e.g., pressure, temperature) into the Tricon system for logic solving.

3625: A 4-Channel Isolated Analog Output Module, used in applications requiring fewer channels but the same high level of reliability.

8312: Main Processor for the Tricon v11 system, which commands and communicates with the 2351 module.

2401: Digital Input Module, used to read discrete signals from devices like emergency stop buttons and pressure switches.

2462: Digital Output Module, used to control on/off devices such as solenoid valves and motor starters.