ICS Triplex T8402

Product Name

Trusted TMR 60-Channel Digital Input Module

Product Introduction

The T8402 is a high-reliability digital input module from ICS Triplex (Rockwell Automation), purpose-built for Trusted Triple Modular Redundant (TMR) safety control systems. It provides 60 channels of dual digital input with built-in fault tolerance and comprehensive diagnostics, delivering maximum availability for safety-critical industrial applications.

Category:
Description

Technical Specifications

  • Module Type: Triple Modular Redundant (TMR) digital input module
  • Number of Channels: 60 dual-channel digital inputs
  • Nominal Input Voltage: 24 V DC
  • Input Voltage Range: 20 V DC to 32 V DC operating range; 0 V DC to 40 V DC signal range
  • Power Consumption: 20 W typical
  • Power Supply: 24 V DC system power
  • Operating Temperature: -40°C to +70°C
  • Storage Temperature: -40°C to +85°C
  • Dimensions: 241 mm × 51 mm × 181 mm
  • Unit Weight: 0.22 kg (0.49 lbs)
  • Hazardous Location Certifications: ATEX, IECEx, CE, UL
  • Safety Integrity Level: SIL 3 capable in TMR system

Functional Features

  • Triple modular redundancy architecture for fail-safe, fault-tolerant operation
  • Hot-swappable design for module replacement without system shutdown
  • Built-in overvoltage, short-circuit and reverse polarity protection
  • Comprehensive on-board diagnostics and per-channel fault detection
  • LED status indicators for power, channel activity and fault status
  • Conformal coating for protection against dust and moisture
  • Full compatibility with all ICS Triplex Trusted TMR system platforms

Application Scenarios

  • Safety Instrumented Systems (SIS) in oil and gas, chemical and petrochemical industries
  • Emergency Shutdown (ESD) systems
  • Fire and gas detection and protection systems
  • Turbine and compressor control systems
  • Nuclear power plant safety systems
  • Process applications requiring SIL 3 safety integrity level

Structural Features

  • Industrial-grade metal module housing
  • Front panel LED indicators for channel and system status
  • High-speed backplane connector for TMR system bus interface
  • Integrated guide rails for smooth chassis insertion

Working Principle

The T8402 uses three independent input circuits to sample each digital input signal simultaneously. Three parallel processing paths independently evaluate input states, and 2-out-of-3 voting logic determines the final validated input status. This architecture ensures that any single component failure does not affect module operation, enabling continuous safe process control. Built-in diagnostic functions continuously monitor all three channels to detect, isolate and report faults.

Installation Requirements

  • Install only in ICS Triplex Trusted system chassis slots
  • Supports hot-swap insertion; follow official module insertion procedure
  • Ensure correct chassis slot alignment before fully inserting module
  • Secure module with captive front panel screw after installation
  • Connect field wiring to appropriate system terminal block assemblies

Usage Notes

  • Verify module operational status via system diagnostics after installation
  • Replace faulty modules during scheduled maintenance when process conditions allow
  • Do not operate module outside specified voltage and temperature ranges
  • Follow site safety procedures when working on safety instrumented systems
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