• Purpose: Convert copper Expander Bus (IMB) signals to single‑mode fibre for long‑distance TMR communication (up to 10 km)

• Coating: Conformal coated PCB (acrylic resin) for harsh environments

• Architecture: TMR Grey Channel (3 independent units per link)

• Safety: IEC 61508 SIL 3 / SIL 4 certified

• Max Distance: 10 km (single‑mode fibre, 9/125 µm)

• Data Rate: 100 Mbps full‑duplex

2. Product Overview

• Conformal coated PCB assembly (improved humidity/chemical resistance)

• Dual 24 V DC diode‑ORed redundant power inputs

• SC fibre connectors (Tx/Rx) for single‑mode fibre

• 100 Mbps copper‑to‑fibre signal conversion for Expander Bus

• Extended temperature range vs standard T8314

• Low power consumption (≤1.7 W)

3. Specifications

3.1 Mechanical

• Form Factor: DIN‑rail mount (EN 60715)

• Dimensions (H×W×D): 125 mm × 35 mm × 110 mm

• Weight: 0.8 kg (1.76 lbs)

• Enclosure: Industrial plastic, IP30

• PCB Protection: Conformal coated (acrylic resin)

• Connectors:

  • Fibre: SC/PC (Tx / Rx)

  • Power: 6‑pin terminal block

  • IMB: 9‑pin D‑sub

3.2 Electrical

• Supply Voltage: 20–32 V DC (nominal 24 V DC)

• Power Input: Dual, diode‑ORed (redundant)

• Power Consumption: ≤1.7 W

• Copper Interface: Expander Bus (IMB), differential

• Fibre Interface: 100 Mbps, single‑mode

• Transmit Power: ≥ –15 dBm

• Receive Sensitivity: ≤ –28 dBm

• Isolation: 2500 V DC (copper ↔ fibre)

3.3 Fibre Optic

• Fibre Type: Single‑mode (9/125 µm)

• Connector: SC (Subscriber Connector)

• Max Distance: 10 km (link budget: 13 dB)

• Wavelength: 1310 nm

3.4 Environmental (Enhanced for T8314C)

• Operating Temp: –40 °C to +70 °C (–40 °F to 158 °F)

• Storage Temp: –40 °C to +85 °C (–40 °F to 185 °F)

• Humidity: 5–95 % RH, non‑condensing

• Altitude: ≤ 2000 m

• Vibration: IEC 60068‑2‑6 (1 g, 10–150 Hz)

• Shock: IEC 60068‑2‑27 (15 g, 11 ms)

• Coating Benefit: Withstands condensation, salt mist, and chemical vapours (e.g., H₂S, ammonia)

3.5 Performance

• Data Rate: 100 Mbps full‑duplex

• Latency: < 1 µs

• Bit Error Rate (BER): < 10⁻¹²

• Channels: 3 independent (Grey Channel for TMR)

4. Front Panel & Connectors

4.1 Front Panel (LEDs)

• PWR (Green): On = 24 V DC OK; Off = No power

• LINK (Green): On = Fibre link up; Flashing = Data activity

• FAULT (Red): On = Link loss / power fault / signal error

4.2 Front Connectors

• SC‑Tx: Fibre transmit (to remote Rx)

• SC‑Rx: Fibre receive (from remote Tx)

4.3 Rear Connectors

• PWR: 6‑pin terminal block (24 V DC, redundant)

• IMB: 9‑pin D‑sub (Expander Bus copper interface)

5. Compatibility & System Architecture

5.1 Compatible Controllers

• T8100: Trusted Processor Chassis

• T8400: Trusted Controller Chassis

5.2 Compatible Expander Modules

• T8310: Expander Processor

• T8311C: Expander Interface Module

• T8312‑4 / T8312‑7: Expander Adaptor Units

5.3 Compatible Expander Chassis

• T8300: 6U Expander Chassis (14 I/O slots)

5.4 TMR System Topology

• Local End: T8311C → T8312 → 3 × T8314C (copper → fibre)

• Fibre Link: 3 × single‑mode fibres (10 km max, routed separately for isolation)

• Remote End: 3 × T8314C (fibre → copper) → T8312 → T8300

6. Installation

6.1 DIN‑Rail Mounting

1. Clip T8314C onto standard DIN rail (top first, then bottom).

2. Push down until latch clicks (secure).

3. Mount in well‑ventilated area; avoid direct heat/condensation.

6.2 Power Wiring

1. Connect 24 V DC to PWR terminal block (redundant inputs).

2. Use 18–22 AWG stranded wire; torque to 0.5–0.6 Nm.

3. Verify PWR LED is ON after power‑up.

6.3 Copper (IMB) Connection

1. Connect TC‑301 copper cable to IMB D‑sub on T8314C rear.

2. Connect other end to T8312‑4 / T8312‑7 ODU port.

3. Tighten D‑sub screws (hand‑tight only).

6.4 Fibre Connection

1. Clean SC connectors with lint‑free cloth + isopropyl alcohol.

2. Insert Tx fibre → SC‑Tx; Rx fibre → SC‑Rx.

3. Push until click (positive lock).

4. At remote end, cross‑connect (local Tx → remote Rx; local Rx → remote Tx).

5. Verify LINK LED steady ON after 10–30 seconds.

6.5 TMR Installation Note

• Use three T8314C units per TMR link; route fibre cables separately to avoid common‑mode faults.

7. Operation & Diagnostics

• Power‑up: PWR ON; LINK flashes during sync (10–30 s).

• Normal Operation: PWR + LINK steady GREEN; FAULT OFF.

• Fault Conditions:

  • FAULT ON: Fibre link loss, power failure, or signal error.

  • LINK Flashing: Normal data activity.

• Diagnostics: Faults logged to system HMI; LEDs provide local status.

8. Maintenance & Troubleshooting

8.1 Routine Maintenance (Harsh Environment Focus)

• Quarterly: Check LEDs; inspect SC connectors for dirt/corrosion.

• Annually: Clean SC connectors; verify DIN rail/wiring tightness; check conformal coating for damage.

8.2 Common Issues

• PWR LED Off: Check 24 V DC supply; verify redundant wiring.

• LINK LED Off: Clean SC connectors; check fibre continuity; swap Tx/Rx.

• FAULT LED On: Replace T8314C; inspect fibre for breaks/bends.

• Intermittent Link: Check fibre bend radius (min 30 mm); re‑seat connectors.

9. Safety & Compliance

• Install only in Trusted T8000 SIS environments.

• Comply with IEC 61508 SIL 3 / SIL 4 system requirements.

• Use only single‑mode 9/125 µm fibre; avoid multi‑mode.

• Certifications: CE, UL, CSA, ATEX II 3G Ex ec IIC T4 Gc, IECEx, CCC (China).