I. Core Parameters (AI3351, Official Standard Version)

1) Basic Specifications

Model: AI3351 (Analog Input Module, 32 Ch, TMR, High Density)

Number of Channels: 32 channels / Module (Single-ended common ground, 32-point high density)

Signal Type (Software Configuration):

Current: 4–20mA (2–22mA diagnostic range)

Voltage: 0–5V

Resolution: 12 bits

Accuracy: ±0.15% FS @ 25℃

Sampling Rate: 16Hz (All channels synchronized, 62.5ms / scan)

Input Impedance: Current 250Ω; Voltage ≥1MΩ

Isolation: Field ↔ System ≥1500VAC; Channel-to-channel common ground, no isolation

Diagnosis: Open circuit / Short circuit / Overrange, FVD (forced value diagnosis), Fuse blowout

Safety Level: SIL3 (IEC 61508, TÜV Certification)

Redundant Architecture: TMR Triple Redundancy (Three-channel independent sampling, median voting)

Power Supply: 24VDC (Backplane Power Supply)

Power Consumption: Approximately 20W

Operating Temperature: -40℃ ~ +70℃

Certifications: CE, UL, CSA, ATEX/IECEx, TÜV SIL3

Installation: Tricon Host Rack Slot (19 inches)

Matching Terminal Board: 9771-210 (16 points) × 2 pieces

Matching Cable: 4000016-015 (Flat Cable, 2 pieces)

2) Panel Indicators

PWR (Green): Module Power Supply Normal

OK (Green): TMR Voting Normal, Module Running Normal

FAULT (Red): Module Fault / Channel Fault / Diagnostic Exception

CH01–CH32 (Yellow/Green): Channel Status (Normal / Fault)

3) AI3351 vs AI2351 vs 3805E (Key Differences)

AI3351: 32 points, 12 bits, common ground, high density, SIL3, economical general-purpose; large-scale ordinary circuit

AI2351: 8 points, 24 bits, point-to-point isolation, high precision, multiple signals, SIL3; critical safety circuit

3805E: 16 points, 16 bits, single channel, SIL2, standard accuracy; general economic

II. Usage Instructions (Wiring + Configuration + Maintenance)

1) Wiring (with 9771-210 Terminal Board)

4–20mA Two-wire Transmitter

Transmitter + → CHx+

Transmitter‑ → CHx-

Shield → SHD (Single-ended Ground)

0–5V Voltage Signal

Signal + → CHx+

Signal‑ → CHx-

Shield → SHD

2) Configuration (TriStation)

Select AI3351 in Hardware Slot

Channel Parameters: Input Type → 4–20mA or 0–5V

Set Range, Filtering, Alarm Threshold

Download Configuration, Module Reboot Effective

3) Fault Troubleshooting

FAULT (Red) On: Channel Short Circuit / Open Circuit / Overrange → Check Wiring, Terminal Board, Transmitter

OK Not On: Backplane Power Supply, Module Firmware, TMR Synchronization Fault

Signal Jump: Check Shield Ground, Cable Length, Interference Source