Manufacturer: ICS Triplex Part number: ICS Triplex T3511
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T3511: Product OverviewThe T3511 serves as the central processing unit within the ICS Triplex Trusted TMR (Triple Modular Redundant) safety instrumented system (SIS). Its role is to execute the application logic that governs critical safety functions, such as emergency shutdown or fire and gas detection. Positioned in a rack-based chassis alongside I/O modules, it forms the decision-making core of the SIS architecture. The module handles digital and analog signals routed through its associated input/output carriers, processing these signals according to the programmed safety logic to determine the appropriate output state.The core functionality involves a deterministic execution environment where the safety logic is run. The T3511 operates as part of a TMR triad; three identical processor units execute the same program simultaneously and vote on the output state. A discrepancy among the three units indicates a fault in one, which is then isolated by the system diagnostics, while the two agreeing units continue to control the process safely. This design provides high immunity to common-cause failures. The T3511 belongs to the Trusted product family, a platform renowned for its rigorous approach to fault tolerance and compliance with international safety standards. The benefits of this platform include enhanced plant safety, reduced spurious trips due to robust diagnostics, and simplified validation for safety audits, making it a dependable choice for high-risk applications.
ICS Triplex T8431C
T3511: Technical Specifications
Model Number: T3511
Manufacturer: ICS Triplex
Product Type: TMR Logic Solver Processor
Processor Architecture: 32-bit RISC
Memory: 8 MB Flash, 16 MB RAM
Power Supply: 24 VDC nominal (18-32 VDC range)
Operating Temperature: -40°C to +70°C (-40°F to +158°F)
Communication Interfaces: 2 x Ethernet (RJ45), 2 x RS-232 (Serial)
Safety Integrity Level: SIL 3 (certified per IEC 61508)
Dimensions: 31.8 mm x 128.3 mm x 119.9 mm (1.25 in x 5.05 in x 4.72 in)
Weight: Approximately 0.5 kg (1.1 lbs)
Certification: TÜV Rheinland certified
Input Voltage Range: 5 VDC (from chassis backplane)
ICS Triplex T8431C
Core Features & Customer ValueTriple Modular Redundancy: The module operates as part of a three-way redundant system. Each of the three processors executes the identical application code and votes on the output. For the end user, this means a single hardware or transient software fault is detected and isolated without causing a system failure or a dangerous loss of control. This architecture significantly enhances system availability and reliability in safety-critical roles.Comprehensive Diagnostics: The processor continuously performs self-diagnostics, including memory checks, program execution monitoring, and internal hardware verification. This feature provides early detection of latent faults. For the maintenance team, it translates to predictive maintenance opportunities and minimizes the risk of an undetected fault compromising the safety function during a demand.Deterministic Execution Engine: The module runs a real-time operating system that guarantees a consistent and predictable scan cycle for the safety logic. Engineers can rely on this determinism to accurately calculate the system’s response time to a process upset. This predictability is essential for meeting safety case requirements and validating that the system will meet its specified safety performance.Flexible Configuration Software: The module is programmed using the associated Logic Developer software package, which allows for graphical configuration of logic diagrams. This environment enables engineers to easily implement complex interlocks and sequences. The value lies in reduced engineering time during initial setup and simplified modifications during system lifecycle management.Typical ApplicationsThe T3511 is implemented in safety instrumented systems requiring high reliability and fault tolerance. A common application is in the emergency shutdown (ESD) systems of offshore oil and gas production platforms, where it is responsible for isolating hydrocarbon inventories in the event of a wellhead rupture or loss of containment. In this scenario, the module’s TMR architecture ensures continuous operation despite the harsh marine environment and potential for electrical transients.Another specific use case is within burner management systems (BMS) at large steam-electric power plants. Here, the module manages the sequencing of fuel and air valves to ensure safe startup, operation, and shutdown of combustion turbines and boilers. It prevents unsafe conditions such as flameout or fuel-rich explosions. In the chemical industry, the module is found in the protection systems for polymerization reactors, where it can initiate a rapid quench or depressurization sequence upon detecting runaway reaction conditions.
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