ICS Triplex T9402 Digital Input Module | 24V DC DI SIL 3

Product Description

Overview

The ICS Triplex T9402 is a high-integrity Digital Input (DI) module engineered for use in Safety Instrumented Systems (SIS) and critical process control applications. Designed for industrial environments where functional safety and availability are paramount, this module interfaces reliably with field sensors such as switches, proximity detectors, and emergency shutdown devices.

Architecture and Design

T9402 incorporates a fault-tolerant architecture with TMR (Triple Modular Redundancy) principles or high-integrity dual-channel voting mechanisms depending on the system configuration. Each input is continuously monitored and validated to detect latent faults, ensuring uninterrupted operation in SIL 3 safety applications. The module is hot-swappable, allowing replacement without system downtime.

Performance Features

Input Capabilities

• Supports 16–32 digital channels per module depending on chassis configuration

• Nominal input voltage: 24V DC

• Logic thresholds: Logic ‘0’ < 5V, Logic ‘1’ > 15V

• Low input current minimizes internal heat and improves cabinet efficiency

Safety and Reliability

• Certified for SIL 3 functional safety according to IEC 61508

• High-resolution Sequence of Events (SOE) recording at 1 ms for precise trip analysis

• Galvanic isolation between field wiring and system logic for protection against transients

Diagnostics and Fault Detection

• Detects open-circuit and short-circuit wiring conditions when used with end-of-line resistors

• Performs internal hardware voting and continuous self-tests to ensure signal integrity

• LEDs indicate per-channel status, health, and fault conditions

Physical and Environmental

• Operating temperature range: 0°C to 60°C (32°F to 140°F)

• EMC-resistant design withstands high levels of industrial electrical noise and transients

• Compact module design optimizes space while maintaining high channel density

Technical Specifications

Applications

The T9402 is ideal for high-availability and safety-critical applications including:

• Emergency Shutdown (ESD) systems

• Fire and Gas (F&G) detection

• High-integrity process control loops in chemical, oil & gas, and power generation industries

FAQ

Q1: How many input channels does the T9402 support?
A: Typically 16 to 32, depending on chassis and system configuration.

Q2: What is the input voltage range?
A: Nominal 24V DC with logic thresholds: Logic ‘0’ < 5V, Logic ‘1’ > 15V.

Q3: Is the module hot-swappable?
A: Yes, it can be replaced without interrupting the system.

Q4: What safety standard does the module comply with?
A: Certified for SIL 3 according to IEC 61508.