The T8403C serves as a critical component in safety instrumented systems (SIS) and high-availability process control applications. This module functions as a 24V DC digital input interface within the Trusted TMR (Triple Modular Redundancy) platform, providing the first layer of signal conditioning and processing for field devices in critical control scenarios. Its primary role is to convert field-level digital signals from devices such as limit switches, pushbuttons, and proximity sensors into processed data for the main Trusted system processors.This module belongs to the Trusted TMR product family, which employs a hardware-based triple modular redundancy architecture. Each of the 40 input channels is processed through three independent circuits that operate in parallel. The system continuously compares the results from all three processing paths, allowing it to detect and compensate for failures in any single path without interrupting system operation. This architecture ensures that the module maintains operational integrity even when component-level failures occur.The Trusted platform’s design philosophy centers on achieving maximum system availability through fault tolerance rather than simply relying on high-reliability components. This approach recognizes that in complex industrial systems, component failures are inevitable, and the system must be designed to continue operating safely despite these failures. The T8403C implements this philosophy at the I/O level, providing a robust interface between field devices and the safety-critical control system.
ICS Triplex T8403C
T8403C: Technical Specifications
Model Number: T8403C
Manufacturer: ICS Triplex (Rockwell Automation)
Product Type: 40-Channel TMR Digital Input Module
Input Voltage: 24V DC nominal (18-32V DC operating range)
Number of Channels: 40 channels, triple redundant
Input Current: Approximately 2 mA per channel at 24V DC
Isolation: 2500V RMS optical/electrical isolation
Event Sequence Resolution: 1 millisecond
Operating Temperature: -40°C to +70°C
Safety Certification: TÜV certified to IEC 61508 SIL 3
Communication Interface: Backplane integration with Trusted TMR system
Diagnostic Coverage: Comprehensive onboard diagnostics and self-test
Weight: Approximately 1.18 kg
Core Features & Customer Value
Triple Modular Redundancy Architecture: The module’s TMR design provides three independent processing paths for each input channel. This architecture delivers immediate value by eliminating single points of failure at the I/O level. For operations engineers, this means that a component failure in one processing path does not necessitate a system shutdown or compromise safety functions. The system continues operating using the two remaining healthy paths while alerting maintenance personnel to the need for repair.Comprehensive Diagnostic Capabilities: Each channel includes continuous monitoring for field wiring faults including open circuits and short circuits. The module also performs regular self-tests on its internal circuitry. These diagnostic features provide maintenance teams with precise fault location information, significantly reducing mean time to repair (MTTR). The 1-millisecond event sequence resolution allows operations teams to accurately reconstruct event sequences during incident investigations, which is particularly valuable in complex process upsets.Wide Operating Temperature Range: The -40°C to +70°C operating range ensures reliable performance in extreme environmental conditions commonly encountered in industrial settings such as compressor stations, offshore platforms, and desert installations. This environmental robustness reduces the need for specialized climate control systems in field enclosures, lowering both initial installation costs and ongoing maintenance requirements for temperature management systems.
Typical Applications
In gas turbine control systems, this digital input module is typically deployed to monitor critical protective devices including overspeed detection systems, flame detection units, and vibration monitoring system contacts. The triple redundancy ensures that turbine protection functions remain operational even if individual sensor circuits develop faults. The high-speed event sequencing capability provides precise timing data for turbine trip analysis, which is essential for determining the root cause of protection system activations.In offshore oil and gas production platforms, the module is commonly specified for emergency shutdown (ESD) systems where it interfaces with pressure safety switches, level detection switches, and gas detection system contacts. The SIL 3 certification and robust environmental specifications make it suitable for the harsh marine environment, while the comprehensive diagnostics help maintenance teams identify developing issues during routine testing cycles, preventing unplanned production shutdowns.For pipeline compressor station applications, the input module handles signals from emergency shutdown buttons, fire detection systems, and equipment vibration monitors. The wide operating temperature range ensures reliable operation in unmanned remote stations exposed to extreme weather conditions. The hot-swappable capability allows for module replacement during planned maintenance windows without taking the entire compression train offline, maximizing asset availability.
We've got you covered
We give you access to a global supply of automation parts at your fingertips, ensuring that manufacturers around the world can avoid unnecessary downtime and continue to do what they do best – making our world possible.
Full 12-month warranty on all components
Dedicated after-sales support
Same-day dispatch on 1000s of parts
All units are fully tested
Continue Searching
We're here when you need us
What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
Full 12-month warranty
Available for dispatch immediately
We deliver worldwide
Full 12-month warranty on all components
Full 12-month warranty on all components
