ICS Triplex T8402 Trusted Dual 24 Vdc Digital Input Module - 60 Channel

The ICS Triplex T8402 is a high-density digital input interface module designed for fault-tolerant operation within the Trusted Safety Instrumented System (SIS) and critical process control platforms. The device interfaces with up to 60 field input devices, utilizing a One-Out-Of-Two D (1oo2D) voting architecture across all channels to provide comprehensive fault detection and tolerance. Each input line is duplicated and measured via sigma-delta ($\Sigma\Delta$) input circuits, enabling precise voltage conversion and real-time comparison against user-configurable threshold levels for contact state determination and open or short circuit line monitoring.

Features

• 60 duplicated input channels per module providing 1oo2D voting architecture.
• Individual sigma-delta ($\Sigma\Delta$) analog-to-digital converters for each channel on every slice.
• Selectable line monitoring per channel for open-circuit and short-circuit field wiring fault detection.
• Integrated Sequence of Events (SOE) reporting with 1 ms event resolution and $\pm$10 ms time-stamp accuracy.
• Configurable 50/60 Hz digital filtering to reduce field-induced electrical noise.
• Hot-swappable online replacement via dedicated Companion Slot or SmartSlot configurations.
• Front panel tri-color LED indicators for slice health, operational mode, and module status voting.
• 2500 V impulse withstand isolation barrier for field protection.

Applications

• Emergency Shutdown Systems (ESD)
• Fire and Gas Detection Systems (F&G)
• Burner Management Systems (BMS)
• Turbomachinery Control and Safety
• High-Integrity Pressure Protection Systems (HIPPS)
• Critical Industrial Process Automation and Safety Instrumented Functions (SIF)

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Visual Inspection: Inspect the unit housing and rear connector pins for mechanical damage prior to chassis insertion. Do not attempt to straighten bent pins.
• Module Keying: Ensure polarising keying pins are configured according to system specifications. For model T8402, remove keying pins 1, 3, and 4 on the cable hood.
• Insertion Procedure: Release ejector tabs using the release key, align the unit with the chassis slot guides, and slide in smoothly until seated. Close top and bottom ejector levers until fully locked.
• Hot Swapping: Online replacement is supported using a dedicated Companion Slot or SmartSlot configuration. Verify SmartSlot interconnect wiring before performing standby swap operations.
• Electrostatic Precaution: Static handling procedures must be maintained. Do not touch exposed pin connections or attempt disassembly of the module enclosure.

Compliance and Certifications

• TÜV Certified IEC 61508 SIL 3