ICS Triplex Trusted TMR T8461 Digital Output Module 24/48 VDC

Product Overview

The T8461 is a high-density, 40-channel digital output module designed by ICS Triplex for the Trusted Triple Modular Redundant (TMR) safety system. Built for high-integrity control applications, the T8461 utilizes a voted architecture to provide fault-tolerant switching of field loads. The module is organized into five independent power groups, each containing eight channels, allowing for versatile load distribution and galvanic isolation between groups. This hardware is specifically engineered for SIL 3 environments where system uptime and fail-safe performance are non-negotiable.

Technical Specifications

• Manufacturer: ICS Triplex (Rockwell Automation)

• Model Number: T8461

• Architecture: Triple Modular Redundant (TMR)

• Output Channels: 40 (organized into 5 groups of 8)

• Field Voltage Range: 18–60 VDC (supports 24V and 48V nominal systems)

• System Voltage Range: 20–32 VDC

• Output Current Rating: 0.75 A continuous per channel / 6 A per power group

• Minimum Load Current: 25 mA (required for accurate line monitoring)

• On-State Resistance: 0.6 Ω (nominal)

• Off-State Leakage Resistance: 33 kΩ

• Short Circuit Protection: Electronic latching with automatic fault reporting

• Response Timing: 0.5 ms turn-on/off delay; 0.5 ms sample update time

• Isolation: 50V sustained between groups; 1000V peak

• Power Consumption: 22 W (System Supply) / 18 W (Field Supply @ 24V)

• Heat Dissipation: Significant at full load; ensure proper rack ventilation

• Dimensions: Standard Trusted module form factor