Manufacturer: ICS Triplex Part number: ICS Triplex T8471
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T8471: Product OverviewThe ICS Triplex T8471 is a triple modular redundant (TMR) digital input module designed for high-integrity safety instrumented systems within the Trusted platform. This module serves as the primary interface between field devices and the safety controller, providing fault-tolerant acquisition of digital status signals from sensors, switches, and other binary field devices. The module implements a sophisticated architecture where three independent input channels process each field signal, with voting logic that compares results across all channels to detect and compensate for potential failures.Installed in a Trusted system chassis, the module accepts 32 channels of 24V DC digital inputs in a sinking configuration. Each input channel 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, providing a single, validated status to the controller.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 design includes comprehensive diagnostics that monitor channel health, detect field wiring faults, and report module status to the system controller. The module’s architecture ensures that safety functions are maintained even in the presence of internal hardware faults or external disturbances, providing the necessary features to achieve Safety Integrity Level (SIL) 3 certification according to IEC 61508 standards.
ICS Triplex T8153C
T8471: Technical Specifications
Model Number: T8471
Manufacturer: ICS Triplex
Product Type: TMR Digital Input Module
Number of Channels: 32 channels
Input Type: 24V DC sinking
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
Common Mode Rejection: >120 dB at 60 Hz
Voting Logic: 2oo3 (two-out-of-three) voting
Diagnostics: Open circuit detection, short circuit detection
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
Power Supply: 24V DC nominal (18-32V DC range)
Hot Swap: Supported with proper sequencing
ICS Triplex T8153C
Core Features & Customer ValueTriple Modular Redundant Input Processing: The TMR design provides three independent measurement paths for each digital input, with voting logic that automatically disregards faulty readings while continuing to provide a valid input status. This architecture ensures continuous operation even with component failures in one or two channels, maintaining input integrity while alerting operators to maintenance needs. For safety system applications, this redundancy provides the high availability necessary for critical protection systems while meeting SIL 3 requirements.Comprehensive Field Diagnostics: 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.High-Density Channel Configuration: The 32-channel configuration provides significant I/O capability in a single module slot, reducing the number of modules required for applications with numerous digital sensors. This high channel density is particularly valuable in complex safety systems where multiple limit switches, pressure switches, and emergency stops need to be monitored simultaneously. The design reduces system complexity and improves reliability through fewer interconnections.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 during internal component failures, maintaining system availability while meeting SIL 3 requirements.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 input channels will function correctly when activated. The fast response time ensures rapid system reaction to emergency conditions.In turbine control systems, the module monitors overspeed detection systems, vibration switches, and temperature switches. The robust design withstands electrical noise typically present in power generation environments while maintaining accurate signal acquisition. The wide operating temperature range ensures reliable performance in harsh environments.
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