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ICS Triplex T8442 Analog Field Terminal Assembly FTA Board for Trusted TMR SIL3 SIS Safety System

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ICS Triplex T8442 Analog Field Terminal Assembly FTA Board for Trusted TMR SIL3 SIS Safety System
May 15, 2026

ICS Triplex T8442 Analog Field Terminal Assembly FTA Board for Trusted TMR SIL3 SIS Safety System

The T8442 is a Trusted TMR Speed Monitor Module designed for safety-critical rotating machinery protection (turbines, compressors, generators). It provides triple-modular redundant (TMR) speed/acceleration monitoring and quadruple redundant fault-tolerant shutdown outputs for overspeed and over-acceleration protection. It operates as a self-contained fault-tolerant control subsystem inside the Trusted T8000 SIS, supporting up to three independent machine groups (e.g., three turbine trains) in one module.

Description

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1. Introduction

The T8442 is a Trusted TMR Speed Monitor Module designed for safety-critical rotating machinery protection (turbines, compressors, generators). It provides triple-modular redundant (TMR) speed/acceleration monitoring and quadruple redundant fault-tolerant shutdown outputs for overspeed and over-acceleration protection.
It operates as a self-contained fault-tolerant control subsystem inside the Trusted T8000 SIS, supporting up to three independent machine groups (e.g., three turbine trains) in one module.

  • Function: TMR speed/acceleration monitoring + quad redundant safety shutdown outputs

  • Machines: Up to 3 rotating machine groups (turbines/compressors/generators)

  • Inputs per group: 3 × TMR speed channels (active/passive probes)

  • Outputs per group: 2 × quad redundant fault-tolerant shutdown structures

  • Safety: IEC 61508 SIL 3 (TÜV)

  • Architecture: HIFT (Hardware Implemented Fault Tolerance), 3‑2‑0 TMR

  • Isolation: 2500 VDC opto/galvanic isolation

  • SOE: 1 ms time‑stamp resolution

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

2. Product Overview

The T8442 is a single‑width, 6U TMR speed monitor module for T8100 / T8400 chassis. It integrates three independent machine protection groups, each with:

  • 3 × TMR speed input channels (for 3 speed probes per machine)

  • 2 × quad redundant, volt‑free shutdown output structures

Key features:

  • 3 machine groups (supports 3 turbines/compressors)

  • TMR speed inputs (active/passive probe compatible)

  • Quad redundant fault‑tolerant safety shutdown outputs

  • Overspeed / over‑acceleration detection & trip

  • 2500 VDC opto/galvanic isolation (field ↔ system)

  • 1 ms resolution SOE logging

  • Hot‑swap & hot‑standby (companion slot)

  • Comprehensive on‑board diagnostics & self‑test (BIST)

  • Front‑panel LED status indicators (module + groups + I/O)

  • High accuracy: 0.1% FS speed measurement

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. 1.2–1.3 kg

  • Mounting: T8100 / T8400 chassis slots 1–16

  • Termination: T8846 Speed Input FTA (SIFTA)

3.2 Electrical

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

  • Power Consumption: ≤ 22 W

  • Speed Inputs (per group): 3 × TMR channels

    • Probe Types: Active (24 VDC) / Passive (magnetic pickup)

    • Frequency Range: 0–10 kHz

    • Isolation: 2500 VDC opto/galvanic

  • Shutdown Outputs (per group): 2 × quad redundant volt‑free

    • Contact Rating: 2 A @ 250 VAC (resistive)

    • Isolation: 2500 VDC galvanic

3.3 Functional

  • Redundancy: TMR (inputs), Quad redundant (outputs)

  • Voting: 1oo2D per TMR slice; quad fault‑tolerant outputs

  • Monitoring: Speed, acceleration, overspeed, over‑acceleration

  • Diagnostics:

    • Probe open/short/fault

    • TMR mismatch

    • Output contact health

    • On‑board BIST (periodic self‑test)

  • SOE Resolution: 1 ms

  • Response Time: ≤ 1 ms (trip action)

  • Filtering: Configurable noise rejection

3.4 Environmental

  • Operating Temperature: –20 °C to +60 °C

  • 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

3.5 Safety & Certification

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

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

  • Fault Tolerance: TMR 3‑2‑0; quad redundant outputs

  • 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

  • G1/G2/G3 LEDs: Machine group status + speed/ trip indication

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 T8846 SIFTA for field probes

6. Wiring

  • Speed Probes:

    • Active: 24 VDC power + signal

    • Passive: Magnetic pickup (2‑wire)

  • Shutdown Outputs: Volt‑free contacts to ESD/trip circuits

  • Wire Gauge: 16–22 AWG stranded

  • Terminal Torque: 0.5–0.6 Nm

7. Operation

  • Power‑Up: PWR ON; RUN flashes during BIST (5–10 s)

  • Normal: PWR/RUN steady green; FAULT OFF; COM flashing

  • Faults:

    • FAULT ON: TMR mismatch, probe fault, output fault

    • FAULT FLASHING: Single‑path fault, minor mismatch

  • Trip Action: Overspeed/over‑acceleration triggers quad redundant shutdown outputs (≤1 ms)

  • SOE: All speed threshold crossings & trips time‑stamped at 1 ms

8. Ordering Information

  • T8442: Standard TMR speed monitor (–20 °C to +60 °C)

  • T8442C: Conformal coated (harsh environment, extended temp)

  • T8846: Speed Input FTA (SIFTA)

  • T8100 / T8400: Trusted chassis


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