Manufacturer: ICS Triplex Part number: ICS Triplex T7481A
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T7481A: Product OverviewThe ICS Triplex T7481A is a triple modular redundant (TMR) digital output module designed for high-integrity safety instrumented systems within the Trusted platform. This module functions as the critical interface between the safety controller and field actuators, providing fault-tolerant control of devices such as solenoid valves, motor starters, and alarm annunciators. The module implements a robust architecture where three independent output channels control each field device, with voting logic that ensures correct operation even during internal component failures.Installed in a Trusted system chassis, the module provides 16 channels of 24V DC digital outputs capable of switching field loads directly. Each output channel incorporates three completely independent switching circuits that operate in parallel. The voting logic compares the commanded state from the three controller partitions and uses a two-out-of-three voting scheme to verify proper operation. This design ensures that a single component failure in any part of the output circuitry does not prevent the safety system from performing its intended function, maintaining system availability while meeting rigorous safety integrity requirements.As part of the Trusted safety platform, this output module supports the high availability and safety integrity levels required in critical process safety applications. The design includes comprehensive diagnostics that monitor output channel health, detect field wiring faults, and verify that field devices are responding correctly to output commands. The module performs continuous self-tests of the output circuitry, including load verification and fault detection capabilities. This diagnostic coverage, combined with the hardware redundancy, provides the necessary features to achieve Safety Integrity Level (SIL) 3 certification according to IEC 61508 standards.
ICS Triplex T7481A
T7481A: Technical Specifications
• Model Number: T7481A
• Manufacturer: ICS Triplex
• Product Type: TMR Digital Output Module
• Number of Channels: 16 channels
• Output Type: 24V DC solid state
• Output Current: 2A per channel continuous
• Voltage Range: 18-30V DC operating range
• On-State Voltage Drop: <1.5V at 2A
• Off-State Leakage: <1 mA
• Response Time: <1 ms turn-on, <2 ms turn-off
• Overload Protection: Electronic current limiting
• Short Circuit Protection: Automatic shutdown and restart
• Isolation: 1500V AC channel-to-channel and channel-to-system
• Voting Logic: 2oo3 (two-out-of-three) voting
• Diagnostics: Open circuit detection, short circuit detection, load verification
• Safety Integrity: SIL 3 capable per IEC 61508
• MTBF: >100 years
• Operating Temperature: -40°C to +70°C
• Connection: Removable terminal blocks
• Status Indicators: Per-channel status and fault LEDs
• Hot Swap: Supported with proper sequencing
• Power Supply: 24V DC nominal (18-32V DC range)
ICS Triplex T7481A
Core Features & Customer ValueTriple Modular Redundant Output Architecture: The TMR design provides three independent switching paths for each output channel, ensuring continued operation even with multiple component failures. The voting logic continuously monitors all three output circuits and can maintain correct operation while reporting faults. For safety system applications, this redundancy provides the fault tolerance necessary to maintain system availability while meeting the requirements for SIL 3 certification. The architecture eliminates single points of failure in the output path, which is critical for safety functions where reliable operation is mandatory.High-Current Switching Capability: With 2A per channel switching capacity, the module can directly drive many field devices without requiring interposing relays. This reduces system complexity and improves reliability by eliminating additional components. The solid-state switching provides fast response times and long service life compared to electromechanical relays. The electronic current limiting and short circuit protection ensure safe operation under fault conditions, protecting both the module and connected field devices.Comprehensive Diagnostic Coverage: Advanced diagnostics monitor each output channel for field wiring faults including open circuits and short circuits. The system also continuously monitors the health of internal components and the voting logic itself. This diagnostic capability provides early warning of developing issues and supports predictive maintenance strategies. The high diagnostic coverage factor contributes to the module’s ability to achieve SIL 3 performance by detecting and reporting dangerous failures before they compromise the safety function.Typical ApplicationsIn emergency shutdown systems for hydrocarbon processing facilities, the module controls final elements such as shutdown valves and emergency ventilation dampers. The TMR architecture ensures that safety actions will be executed when required, even if internal component failures occur. The high current capability allows direct control of solenoid valves without additional relays.For fire and gas protection systems, the module operates alarm annunciators, horn/strobe units, and suppression system releases. The comprehensive diagnostics provide assurance that output circuits will function when activated. The fast response time ensures rapid system reaction to emergency conditions.In turbine protection systems, the module controls fuel shutoff valves and compressor anti-surge valves. The robust design withstands electrical noise typically present in power generation environments while maintaining reliable operation. The wide operating temperature range ensures performance in both control room and field installations.
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