1. Introduction

• Function: 20‑channel isolated analogue input (4–20 mA)

• Architecture: Fully triplicated TMR (3‑2‑0 fault tolerant)

• Safety: IEC 61508 SIL 3

• Inputs: 4–20 mA (per‑channel configurable)

• Resolution: 12‑bit (1 part in 4096)

• Isolation: 2500 VDC optical/magnetic 2‑stage galvanic isolation

• SOE: 1 ms time‑stamp resolution

• Hot‑swap: Supported

• Diagnostics: Per‑channel open/short/range fault detection

2. Product Overview

• 20 channels isolated 4–20 mA analogue input

• Triple Modular Redundancy (TMR) with HIFT architecture

• Per‑channel open/short‑circuit and over/under‑range detection

• 2500 VDC optical/magnetic 2‑stage galvanic isolation

• 1 ms resolution SOE logging

• Hot‑swap capable (Companion Slot / SmartSlot)

• Front‑panel LED status indicators (module + per‑channel)

• Compatible with T8100 / T8400 chassis

• High accuracy: 0.2% of span (25 °C)

3. Specifications

3.1 Mechanical

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

• Dimensions (H × W × D): 241 mm × 30 mm × 300 mm

• Weight: Approx. 1.13 kg

• Mounting: T8100 / T8400 chassis slots 1–16

• Terminals: Front‑panel screw terminals (20 channels)

3.2 Electrical

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

• Power Consumption: ≤ 15 W

• Input Range: 4–20 mA (configurable for 0–20 mA)

• Resolution: 12‑bit (1 part in 4096)

• Accuracy: 0.2% of span (25 °C)

• Temperature Drift: 50 ppm/°C

• Isolation: 2500 VDC optical/magnetic 2‑stage galvanic isolation

• Channel Crosstalk: –40 dB typical

• Update Time: ≤ 1 ms per channel

• Field Loop Supply: External (loop‑powered)

3.3 Functional

• Redundancy: TMR (three independent slices)

• Voting: 1oo2D per channel

• Diagnostics:

  • Open‑circuit detection

  • Short‑circuit detection

  • Over‑/under‑range detection

  • On‑board BIST (periodic self‑test)

• SOE Resolution: 1 ms

• SOE Accuracy: ±0.5 ms

• Response Time: ≤ 2 ms

• Filtering: Configurable 50 Hz / 60 Hz rejection or fast response

3.4 Environmental

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

• Storage Temperature: –25 °C to +70 °CRockwell Automation

• 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

• Approvals: CE, UL, CSA, ATEX, IECEx

• Fault Tolerance: TMR (3‑2‑0)

• 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–CH20 LEDs: Reflect input status / fault per channel

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

6. Wiring

• Signal Type: 4–20 mA current loop

• Field Connection:

  • Transmitter + → channel +

  • Transmitter – → channel –

• 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, short circuit, overrange

  • FAULT FLASHING: Single‑path fault, minor mismatch

• SOE: All analogue threshold crossings time‑stamped at 1 ms

8. Ordering Information

• T8433: Standard 20‑ch TMR 4–20 mA input (–5 °C to +60 °C)

• T8833: Field Termination Assembly (FTA)

• TC‑T8433: Terminal cable kit

• T8100 / T8400: Trusted chassis