T9801: Product OverviewThe ICS Triplex T9801 is a triple modular redundant (TMR) digital input module designed for high-reliability safety instrumented systems. This module functions as the primary interface between field devices and the Trusted safety controller, providing fault-tolerant acquisition of digital status signals from sensors, switches, and other binary field devices. The module implements a sophisticated triple-redundant architecture where three independent input channels process each field signal, with voting logic that compares results across all three channels to detect and compensate for potential failures.Installed in a Trusted system chassis, the module accepts 24V DC digital inputs from field devices such as emergency stop buttons, limit switches, pressure switches, and level sensors. Each of the 32 input channels is processed through three completely independent signal conditioning circuits, analog-to-digital converters, and microprocessor-based voting logic. This triple-redundant design ensures that a single component failure in any part of the input circuitry does not cause a system failure or loss of the safety function. The voting logic continuously compares the three independent readings and uses a two-out-of-three voting scheme to determine the valid state of each input.As part of the Trusted safety platform, this input module supports the high availability and safety integrity levels required in critical process safety applications. The module includes comprehensive diagnostics that monitor channel health, detect field wiring faults, and report module status to the system controller. The design emphasizes both hardware fault tolerance and advanced diagnostic coverage, providing the necessary features to achieve Safety Integrity Level (SIL) 3 certification according to IEC 61508 standards. The module’s architecture ensures that safety functions are maintained even in the presence of internal hardware faults or external disturbances.
ICS TRIPLEX T9801
T9801: Technical Specifications
• Model Number: T9801
• Manufacturer: ICS Triplex
• Product Type: TMR Digital Input Module
• Number of Channels: 32 channels
• Input Voltage: 24V DC nominal (19-30V DC range)
• Input Type: Sinking or sourcing configurable
• On-State Voltage: 15-30V DC
• Off-State Voltage: 0-5V DC
• Input Current: 8 mA typical at 24V DC
• Response Time: <10 ms
• Isolation: 1500V AC channel-to-channel and channel-to-system
• Diagnostics: Open circuit detection, short circuit detection
• Voting Logic: 2oo3 (two-out-of-three) voting
• 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 LEDs
• Hot Swap: Supported with proper sequencing
ICS TRIPLEX T9801
Core Features & Customer ValueTriple Modular Redundant Architecture: The module’s TMR design provides fault tolerance through hardware redundancy, with three independent signal paths for each input channel. This architecture ensures continuous operation even with multiple component failures, as the voting logic can identify and isolate faulty channels while maintaining the safety function. For safety system applications, this redundancy provides the high availability necessary for critical protection systems while meeting the fault tolerance requirements for SIL 3 certification.Comprehensive Diagnostic Coverage: Advanced diagnostics monitor each input 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.Flexible Field Device Compatibility: The module supports both sinking and sourcing field devices through software configuration, providing flexibility in system design and field device selection. This compatibility reduces installation complexity and allows the module to interface with a wide range of field devices from different manufacturers without requiring external signal conditioning. The wide input voltage range (19-30V DC) accommodates voltage drops in long cable runs and variations in field power supplies.Typical ApplicationsIn emergency shutdown systems for hydrocarbon processing facilities, the module monitors critical process switches such as high-pressure switches, low-level switches, and emergency stop buttons. The TMR architecture ensures reliable detection of process demands even in the event of internal component failures, maintaining the availability of the safety system while meeting the reliability requirements for SIL 3 applications.For fire and gas detection systems, the module interfaces with manual call points and fault contacts from detection systems. The comprehensive diagnostics provide assurance that the input channels are functioning correctly and will respond when activated. The fast response time ensures rapid system reaction to emergency conditions.In turbine control and protection systems, the module monitors overspeed detection systems, vibration switches, and temperature switches. The robust design withstands the electrical noise typically present in power generation environments while maintaining accurate signal acquisition. The wide operating temperature range ensures reliable performance in both indoor and outdoor installations.
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