I. Core Parameters (Official Standard Version of AO3481)

1) Basic Specifications

Model: AO3481 (8 Ch High-Precision Analog Output, TMR)

Number of Channels: 8 channels / module (single-ended, point-to-point isolation)

Output Type (Software Programmable):

Current: 4–20mA (standard), 0–20mA, 0–22mA (overrange)

Voltage: 0–5V, 0–10V, ±10V

Resolution: 16 bits (12 bits for AO2481)

Accuracy: ±0.1% FS (full range, -40°C ~ +70°C)

Response Time: <2ms (all channels synchronized update, faster than AO2481)

Load Capacity:

Current: ≤750Ω (4–20mA)

Voltage: ≥1kΩ

Isolation: 1500VAC from field to backplane; complete isolation between channels

Diagnosis: Open circuit / short circuit / overload, load fault, read verification, FVD, over-temperature

Safety Level: SIL3 (IEC 61508, TÜV Certification)

Redundant Architecture: TMR triple redundancy (three DAC independent outputs, median voting)

Power Supply: 24VDC (backplane, ±10%)

Power Consumption: Approximately 12W

Operating Temperature: -40°C ~ +70°C

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

Installation: Trident main rack slot (19")

Matching Terminal Board: 9761-220 (8-point high-precision isolated terminal board)

Matching Cable: 4000016-010 (flat cable 1 piece)

2) Panel Indicators

PWR (green): Module power supply is normal

OK (green): TMR voting is normal, module is running normally

FAULT (red): Module / channel / diagnostic fault

CH01–CH08 (yellow): Channel activation / fault indication

3) AO3481 vs AO2481 vs AO4481 (Key Differences)

AO3481: 8 channels, 16 bits, ±0.1% FS, <2ms, high precision, multi-range, SIL3; Key precision circuit (precision valve / positioner / actuator)

AO2481: 8 channels, 12 bits, ±0.25% FS, <5ms, standard accuracy, SIL3; General safety circuit (ordinary regulating valve)

AO4481: 16 channels, 12 bits, ±0.25% FS, <5ms, high density, economy model, SIL3; Large-scale general circuit (fan / pump frequency conversion)

II. Usage Instructions (Wiring + Configuration + Maintenance)

1) Wiring (with 9761-220 terminal board, single-ended isolation)

4–20mA precision positioner / regulating valve (two-wire system)

CHx+ → Actuator +

CHx- → Actuator-

SHD → Shielding layer (single-ended grounding)

0–10V high-precision frequency converter / servo (three-wire system)

CHx+ → Signal +

CHx- → Signal-

GND → System ground

2) Configuration (TriStation Trident)

Select AO3481 for hardware slot

Channel Parameters:

Output Type → 4–20mA / 0–10V etc.

Range → Corresponding range

Update Rate → High-speed (2ms) / Standard

Set safety values (FVD), read monitoring, alarm threshold

Download configuration, module restart takes effect

3) Fault Troubleshooting FAULT: Red and bright + CHx: Yellow flashing: Open circuit / Short circuit / Overload → Check wiring, load resistance, actuator

OK: No light: Backplane power supply, firmware, TMR synchronization failure

Output drift / Inaccurate: Check load impedance, shielding grounding, interference source, high-precision calibration