2. Key Features

• 8 isolated analog outputs, 4–20 mA range.

• 12‑bit D/A converter per channel for high resolution.

• Hot‑swappable for online replacement without system shutdown.

• Triplicated I/O Safetybus interface prevents unintended output changes from single faults.

• 2500 Vrms isolation between field and logic circuits.

• TÜV certified (Risk Class 5), compliant with IEC 61508.

• Front‑panel LEDs indicate active/fault and shutdown status.

3. Technical Specifications

• Model: T3470A

• Manufacturer: Rockwell ICS Triplex

• System Compatibility: Regent/Trusted T3 series TMR systems

• Logic Power: 24 VDC ±10%

• Output Signal: 4–20 mA (sink/source selectable)

• Resolution: 12 bits (0.025% of span)

• Accuracy: ±0.1% of span (25°C)

• Isolation Voltage: 2500 Vrms (field‑to‑logic)

• Load Resistance: 0–600 Ω per channel

• Power Consumption: 2.8 W (max)

• Operating Temperature: −40°C to +70°C

• Storage Temperature: −40°C to +85°C

• Humidity: 5%–95% non‑condensing

• Dimensions: 120 mm × 140 mm × 30 mm

• Weight: 0.5 kg

• Certifications: TÜV (Risk Class 5), CE, UL.

4. Installation & Wiring

4.1 Mechanical Installation

• Mount in a standard ICS Triplex T3 series rack (slots 0–15).

• Ensure chassis grounding for ESD protection.

• Maintain ≥25 mm clearance around the module for ventilation.

4.2 Wiring

• Backplane Connector: Connects to system backplane for 24 VDC logic power and triplicated I/O Safetybus communication.

• Field Terminals:

  • 8 analog output channels (CH1–CH8) for 4–20 mA devices.

  • Common ground terminals for field loops.

• Cable Requirements: 18–22 AWG twisted shielded pair; torque terminals to 0.8–1.0 N·m.

• Shielding: Connect cable shield to module chassis ground at one end only.

5. Operation

5.1 Power‑Up & Self‑Test

• Apply 24 VDC logic power; the module runs a 5‑second initialization:

  1. LED test (all status lights on)

  2. RAM/PROM self‑tests

  3. Normal mode (green “ACTIVE” LED on)

• “ACTIVE” LED (green) lights; “FAULT” LED (red) remains off if healthy.

5.2 Normal Operation

• Output Control: Triplicated commands from the system processor are voted; outputs update only if all three paths agree.

• LED Indicators:

  • Green: Module active, no faults.

  • Red: Module/channel fault (open circuit, overload, internal error).

• Signal Range: 4 mA = 0% scale, 20 mA = 100% scale (configurable via system software).

5.3 Fault Handling

• Channel Fault: Module disables the faulty channel; “FAULT” LED lights. Check wiring, load resistance, or field device.

• Module Fault: Communication loss or internal error. Verify backplane connection or replace the module (hot‑swap supported).

6. Maintenance

• Monthly Inspection: Check LED status, wiring tightness, and module temperature.

• Cleaning: Use a dry cloth to remove dust; avoid harsh chemicals.

• Calibration: Recommended every 2 years (via system software or external calibrator).

• Replacement: Hot‑swap procedure: remove faulty module, insert new one, and confirm operation via system diagnostics.

7. Safety Precautions

• ESD Protection: Wear a grounded wrist strap when handling the module.

• Power Isolation: Disconnect 24 VDC logic power before wiring.

• Load Ratings: Do not exceed 600 Ω load resistance per channel.

• Fault Response: Address “FAULT” LED alerts immediately to maintain safety integrity.