Technical Specifications

• Part Number: 51304431-175 (51304431175)

• Module Type: MC-TDIA22 (Digital Input FTA)

• Channel Configuration: 32 × isolated digital input channels (redundant)

• Input Voltage Range: 120/240 VAC ±10%, 50/60 Hz

• Input Current: 10 mA nominal per channel (at 240 VAC)

• Isolation: 1500 VAC rms channel‑to‑backplane isolation

• Logic Compatibility: UCN HPM/APM controller digital input logic

• Power Supply: 24 VDC ±10%, 0.8 A (backplane‑powered)

• Fuse: 5 A SB (system board fuse, non‑replaceable in field)

• Operating Temperature: -20°C to +60°C (conformal coated for harshness)

• Storage Temperature: -40°C to +85°C

• Humidity: 5%–95% RH, non‑condensing

• Dimensions (H×W×D): 307 × 120 × 50 mm (12‑inch size B)

• Weight: ~1.9 kg

• Certifications: CE‑certified, UL‑listed, non‑RoHS

• Coating: Conformal coated (harsh environment protection: dust, moisture, corrosion)

• Terminals: Compression‑type terminals (14–22 AWG)

• Status Indicators: 32 channel LEDs + Power/Fault LEDs

• Response Time: ≤15 ms per channel

Interface & Communication Configuration

• DCS Interface: UCN backplane edge connector (1 Mbps, TDC3000/TPS compatible)

• Field Interface: Compression terminals (32 channels: Line + Neutral)

• Redundancy: Redundant (dual‑controller input support)

• Diagnostics: On‑board self‑diagnostics with fault reporting via UCN

• Wiring: Accepts 14–22 AWG stranded copper wire

Core Functions

1. AC Digital Input Monitoring: 32 isolated channels for 120/240 VAC field device status (switches, relays, contactors).

2. Field Termination: Centralizes AC digital input wiring from field devices to DCS IOPs.

3. Electrical Isolation: Protects DCS from high‑voltage AC spikes, noise, and ground loops.

4. Redundant Operation: Supports dual‑controller redundancy for high‑availability systems.

5. Harsh Environment Protection: Conformal coating safeguards circuitry against dust, humidity, and chemical exposure.

6. Status Visualization: Per‑channel LEDs for instant visual verification of input state.

Application Scenarios

• Process Industries: Chemical, petrochemical, oil & gas, power generation, pulp & paper (harsh areas: high humidity, dust, corrosive fumes).

• Field Device Monitoring: AC switches, limit switches, relay contacts, motor starters, and alarm contacts (120/240 VAC).

• High‑Voltage Input Systems: Monitoring of AC‑powered field devices in harsh environments.

• Redundant Control Systems: Critical processes requiring dual‑controller redundancy.

• CE/UL‑Compliant Installations: Industrial areas needing both CE and UL certification plus conformal coating.

Key Differences: 51304431-175 vs -100/-125/-200/-275

Compatibility Note

• Fully pin‑compatible with 51304431-100/-125/-200/-275; direct drop‑in for TDC3000/TPS UCN racks.

• Recommended for new redundant installations in harsh environments requiring CE/UL compliance.