ICS Triplex T8243 | TMR Digital Input Module
ICS Triplex T8243 | TMR Digital Input Module - Image 2
ICS Triplex T8243 | TMR Digital Input Module - Image 3
ICS Triplex T8243 | TMR Digital Input Module - Image 4

ICS Triplex T8243 | TMR Digital Input Module

  • Brand:​ ICS Triplex
  • •
    Model:​ T8243
  • •
    Product Type:​ TMR Digital Input Module
  • •
    Series:​ Trusted System
  • •
    Core Function:​ Provides 32 channels of triple redundant 24V DC digital input for safety instrumented systems.
  • •
    Key Specs:​ 32 channels, 24V DC sinking input, TMR architecture, SIL 3 capable.
Get a Quote
Manufacturer:
Part number: ICS Triplex T8243
Our extensive catalogue, including : ICS Triplex T8243 , is available now for dispatch to the worldwide.

Description

T8243: Product Overview
The ICS Triplex T8243 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.
T8243: Technical Specifications
  • •
    Model Number:​ T8243
  • •
    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

Core Features & Customer Value
Triple 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 Applications
In 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.

Related products