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T8449

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T8449
May 15, 2026

T8449

The T8449 is a triple‑modular redundant (TMR) 40‑channel configurable digital I/O and valve monitor module for the Trusted T8000 Safety Instrumented System (SIS). It is designed for safety‑critical valve control and position monitoring in ESD, process shutdown, and burner management applications, especially in oil/gas, petrochemical, and power industries. Each of the 40 channels can be independently configured as digital input or digital output, enabling flexible valve solenoid driving and position feedback monitoring on a single module. The module provides 3‑2‑0 TMR fault tolerance, per‑channel line diagnostics, 1 ms SOE, and hot‑swap capability, with full SIL 3 certification. Function: 40‑channel TMR configurable I/O (In/Out) + valve monitor

Description

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1. Introduction

The T8449 is a triple‑modular redundant (TMR) 40‑channel configurable digital I/O and valve monitor module for the Trusted T8000 Safety Instrumented System (SIS). It is designed for safety‑critical valve control and position monitoring in ESD, process shutdown, and burner management applications, especially in oil/gas, petrochemical, and power industries.
Each of the 40 channels can be independently configured as digital input or digital output, enabling flexible valve solenoid driving and position feedback monitoring on a single module. The module provides 3‑2‑0 TMR fault tolerance, per‑channel line diagnostics, 1 ms SOE, and hot‑swap capability, with full SIL 3 certification.

  • Function: 40‑channel TMR configurable I/O (In/Out) + valve monitor

  • Channels: 40 × 24 VDC, software‑configurable Input or Output

  • Outputs: 24 VDC, 2 A continuous per channel; 8 A per power group

  • Inputs: 24 VDC dry contact / voltage sense; 4–20 mA sensor support

  • Safety: IEC 61508 SIL 3 (TÜV), CE, UL, CSA, ATEX, IECEx

  • Architecture: 3‑2‑0 TMR, TriVote™ majority voting, single‑fault safe

  • Isolation: 2500 VDC opto‑galvanic (field ↔ system; ch ↔ ch)

  • Diagnostics: Open/short circuit, overload, TMR mismatch, drift

  • SOE: 1 ms time‑stamp resolution (events/faults)

  • Hot‑swap: Supported (Companion Slot / SmartSlot)

  • Operating Temp: 0 °C to +60 °C (standard); T8449C for –40 °C to +70 °C

2. Product Overview

The T8449 is a single‑width, 6U TMR I/O module for T8100 / T8400 chassis, optimized for valve pack applications requiring both solenoid drive and position feedback. It integrates 40 bidirectional channels arranged into 5 electrically isolated power groups (8 channels per group), allowing mixed input/output mapping and independent group power control.
Key features:

  • 40 configurable In/Out channels: mix digital outputs (solenoids) and digital inputs (limit switches)

  • Dual‑mode signal support: 24 VDC discrete + 4–20 mA analog position sensors

  • TMR voting: auto‑corrects single‑slice faults; no single point of failure

  • Comprehensive per‑channel diagnostics: open/short, overload, mismatch

  • High‑speed SOE: 1 ms resolution for valve state changes and fault events

  • Hot‑swap & hot‑standby: online replacement without safety loop interruption

  • Wide‑range safety certification: SIL 3, ATEX/IECEx for hazardous areas

3. Specifications

3.1 Mechanical

  • Form Factor: T8000 chassis single‑width module, 6U height

  • Dimensions (H × W × D): 266 mm × 31 mm × 303 mm

  • Weight: Approx. 1.2 kg

  • Mounting: T8100 / T8400 chassis slots 1–16

  • Termination: T8849 FTA (Valve Monitor FTA)

  • Protection: Standard industrial coating (conformal coated version T8449C available)

3.2 Electrical

  • System Supply: 20–32 VDC (nominal 24 VDC)

  • Power Consumption: ≤ 27 W

  • Field Supply (Outputs): 18–32 VDC (nominal 24 VDC)

  • Channels: 40, grouped into 5 × 8‑channel power groups

  • Output Rating: 2 A continuous per channel; 8 A peak surge

  • Group Rating: 8 A max per power group

  • Input Type: 24 VDC dry contact / voltage sense; 4–20 mA analog

  • Isolation: 2500 VDC opto‑galvanic (field ↔ system; ch ↔ ch)

  • Leakage Current (Output Off): < 100 µA

  • On‑State Voltage Drop (Output): ≤ 1.2 VDC @ 2 A

3.3 Functional

  • Redundancy: TMR (3 slices, 3‑2‑0 fault tolerance)

  • Voting: TriVote™; auto‑corrects single‑slice faults

  • Channel Configuration: Each channel = Input or Output (software select)

  • Diagnostics:

    • Open/short circuit detection (per channel)

    • Overload / overcurrent protection (per group)

    • TMR mismatch & drift monitoring

    • 4–20 mA sensor range check (input mode)

    • On‑board BIST (periodic self‑test)

  • SOE Resolution: 1 ms (valve state changes, faults, trips)

  • Response Time: ≤ 1 ms (command to output; input to system)

  • Fault Tolerance: Single‑channel/group fault does not affect safety function

3.4 Environmental

  • Operating Temperature: 0 °C to +60 °C (standard)

  • Storage Temperature: –40 °C to +85 °C

  • Humidity: 5–95 % RH, non‑condensing

  • Vibration: 10–57 Hz ±0.075 mm; 57–150 Hz 1.0 g

  • Shock: 15 g, ½ sine wave, 11 ms

  • Hazardous Area: ATEX / IECEx Ex ia IIC T4 Ga (with T8849 Ex FTA)

  • Conformal Coated Version: T8449C (–40 °C to +70 °C, harsh environments)

3.5 Safety & Certification

  • Safety Standard: IEC 61508 SIL 3 (TÜV Certified)

  • Approvals: CE, UL, CSA, ATEX, IECEx, FM

  • Fault Tolerance: TMR 3‑2‑0; single‑fault safe

  • PFHd: < 1.0 × 10⁻⁹ / hour (SIL 3)

4. Front Panel Indicators

  • PWR (Green): ON = module power healthy

  • RUN (Green): ON = active; FLASHING = BIST/initialization

  • FAULT (Red): ON = critical fault; FLASHING = minor fault

  • COM (Green): FLASHING = backplane communication active

  • CH1–CH40 LEDs: Per‑channel status (ON = energized/active; FLASH = fault)

5. Installation

  • Chassis: Insert into any vacant slot in T8100 / T8400 chassis

  • Hot‑Swap: Supported (Companion Slot / SmartSlot)

  • Front‑Panel Screws: Torque 0.8–1.0 Nm

  • Termination: Connect to T8849 FTA (standard or Ex ia hazardous area)

  • Environmental Note: T8449C is recommended for sites with > 85 % RH, corrosive vapors, or temperature extremes

6. Wiring

  • Output Channels: To solenoid valves, relays (24 VDC, 2 A max)

  • Input Channels: From limit switches, 4–20 mA position sensors

  • Field Power: 18–32 VDC to T8849 FTA (per power group)

  • Isolation: Field side isolated 2500 VDC from system/backplane

  • Wire Gauge: 16–22 AWG, stranded, with suitable insulation for Ex areas

7. Ordering Information

  • T8449: Standard 40‑channel TMR configurable I/O/valve monitor module (0 °C to +60 °C)

  • T8449C: Conformal coated 40‑channel TMR configurable I/O/valve monitor module (–40 °C to +70 °C, harsh environments)

  • T8849: Dedicated valve monitor FTA for T8449 / T8449C (standard or Ex ia)

  • T8100 / T8400: Trusted system chassis


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