Product Description

Triple Modular Redundancy for Critical Safety Logic

The T8403C (Model: T8403C) is a high-integrity 24V DC digital input module designed for the Rockwell Automation ICS Triplex Trusted system. Engineered for Safety Instrumented Systems (SIS), the T8403C (Catalog Number: T8403C) utilizes a Triple Modular Redundant (TMR) architecture to provide the highest levels of fault tolerance and system availability. Each of the 40 input channels is processed through three independent sub-channels, using a majority voting system to identify and isolate internal hardware faults without interrupting the safety function. This makes the module an industry standard for Emergency Shutdown (ESD) and Fire and Gas (F&G) applications.

Detailed Technical Specifications

The T8403C incorporates advanced Sigma-Delta input circuitry to ensure precise signal detection and comprehensive line monitoring.

• Manufacturer: ICS Triplex (Rockwell Automation)

• Model Designation: T8403C

• Module Type: TMR Digital Input (24V DC)

• Input Channels: 40 Channels

• System Architecture: Triple Modular Redundant (TMR)

• Processor: 32-bit RISC, 200 MHz

• On-board Memory: 16 MB RAM, 8 MB Flash

• A/D Technology: Sigma-Delta converters for enhanced noise rejection

• Line Monitoring: Field-selectable for open-circuit and short-circuit detection

• Communication Support: Ethernet, Serial, Modbus (via Trusted Controller)

• Redundancy Capacity: Supports integration with up to 32 redundant controllers

• Input Voltage Range: 18V DC to 32V DC (Nominal 24V DC)

• Operating Temperature: -40 °C to +70 °C (-40 °F to +158 °F)

• Maintenance Feature: Hot-swappable design for online replacement

• Diagnostics: Comprehensive internal self-test and field-loop monitoring