ICS Triplex T8403C Digital Input Module

Description

The ICS Triplex T8403C is a 40-channel Trusted TMR 24Vdc Digital Input module designed for high-integrity safety and critical control. It utilizes a Triple Modular Redundant (TMR) architecture to ensure fault tolerance and continuous operation in SIL 3 environments.

Specifications

• Input Channels: 40 channels, isolated in groups.
• Input Voltage: 24 Vdc nominal (15 Vdc to 32 Vdc range).
• Safety Rating: IEC 61508 SIL 3 certified.
• Architecture: 2oo3 (Two-out-of-three) hardware voting logic.
• Power Consumption: 12 W typical; 18 W maximum.
• Threshold Voltage: Typically 11 Vdc for transition from Logic 0 to Logic 1.
• Input Filter: 1 ms to 250 ms (user-configurable).
• Isolation: 50V sustained (tested to 1000V ac).
• Self-Diagnostics: Over 99% fault detection coverage.

Features

• Triple Modular Redundancy: Processes each input through three independent paths and votes to ensure the highest data integrity.
• Line Monitoring: Capable of detecting open circuit and short circuit field wiring faults when used with external resistors.
• Hot Swappable: Supports online replacement of modules without requiring a system shutdown or affecting process safety.
• Fault Tolerance: Continues to operate correctly even in the presence of a single internal hardware failure.
• Sequence of Events (SOE): Provides high-resolution time-stamping for input transitions to assist in post-trip analysis.
• Automatic Self-Test: Performs continuous background testing of the input circuitry including the ADC and voting logic.