1. Introduction

• Function: 40‑channel TMR digital output (24/48 VDC, solenoid/relay drive)

• Channels: 40 × 24/48 VDC digital outputs, grouped into 5 × 8‑channel isolated power groups

• Outputs: 18–60 VDC range, 0.75 A continuous per channel; 6 A max per power group

• 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, load fault

• SOE: 1 ms time‑stamp resolution (output state changes/faults)

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

• Operating Temp: –5 °C to +60 °C (standard)

2. Product Overview

• 40 TMR digital outputs: 18–60 VDC (24/48 VDC nominal), 0.75 A continuous, for solenoids, relays, actuators

• 5 isolated power groups: 8 channels each, 6 A max per group, fault isolation

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

• Per‑channel diagnostics: open/short circuit, overload, stuck on/off detection

• High‑speed SOE: 1 ms resolution for output 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 (with external barriers)

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. 1.285 kg

• Mounting: T8100 / T8400 chassis slots 1–16

• Termination: T8861 FTA (Digital Output FTA)

• Protection: Standard industrial coating (conformal coated version T8461C available on request)

3.2 Electrical

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

• Power Consumption: ≤ 22 W (system); ≤ 18 W (field @ 24 V, 0.75 A/channel)

• Field Supply (Outputs): 18–60 VDC (nominal 24/48 VDC)

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

• Output Rating: 0.75 A continuous per channel; 2 A peak surge

• Group Rating: 6 A max per power group

• Output Voltage Range: 18–60 VDC (operating); –1 to 60 VDC (withstand)

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

• Leakage Current (Output Off): < 100 µA

• On‑State Voltage Drop (Output): ≤ 1.2 VDC @ 0.75 A

• Short Circuit Protection: Electronic latching, automatic per‑channel shutdown

• Minimum On‑State Load Current: 25 mA

3.3 Functional

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

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

• Channel Type: Dedicated digital output (no input configuration)

• Diagnostics:

  • Open/short circuit detection (per channel)

  • Overload / overcurrent protection (per channel/group)

  • TMR mismatch & drift monitoring

  • Stuck on/off failure detection

  • On‑board BIST (self‑test interval: 2 minutes)

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

• Response Time: ≤ 0.5 ms (command to output)

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

3.4 Environmental

• Operating Temperature: –5 °C to +60 °C

• Storage Temperature: –25 °C to +70 °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 external safety barriers)

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 T8861 FTA (standard or Ex ia with barriers)

• Environmental Note: For harsh environments, order conformal coated version T8461C

6. Wiring

• Output Channels: To solenoid valves, relays, 24/48 VDC actuators (0.75 A max)

• Field Power: 18–60 VDC to T8861 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

• Safety Note: For hazardous areas, use approved intrinsic safety barriers between module and field devices

7. Ordering Information

• T8461: Standard 40‑channel TMR digital output module (24/48 VDC, –5 °C to +60 °C)

• T8461C: Conformal coated 40‑channel TMR digital output module (extended temperature, harsh environments)

• T8861: Dedicated digital output FTA for T8461 / T8461C (standard or Ex ia)

• T8100 / T8400: Trusted system chassis