I. Core Parameters (Official Standard Version of AO2481)

1) Basic Specifications

Model: AO2481 (8 Ch 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

Voltage: 0–5V, 0–10V

Resolution: 12 bits

Accuracy: ±0.25% FS (4–20mA, 0–60℃)

Response Time: <5ms (all channels synchronized update)

Load Capacity:

Current: ≤750Ω (4–20mA)

Voltage: ≥1kΩ

Isolation: 1500VAC from field to backplane; channel-to-channel isolation

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

Safety Level: SIL3 (IEC 61508, TÜV Certification)

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

Power Supply: 24VDC (backplane)

Power Consumption: Approximately 10W

Operating Temperature: -40℃ ~ +70℃

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

Installation: Trident chassis slot (19 inches)

Matching Terminal Board: 2481 substrate (8-point isolated terminals)

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

2) Panel Indicators

PWR (green): Normal power supply

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

FAULT (red): Module / channel / diagnostic failure

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

3) Comparison of AO2481 (Same Platform AO Module)

AO2481: 8 channels, 12 bits, 4–20mA/0–10V, standard accuracy, TMR, SIL3; General safety loop control valve

AO3481: 8 channels, 16 bits, high precision, multi-range, TMR, SIL3; Key high-precision actuator (precision valve / positioner)

AO4481: 16 channels, 12 bits, high density, economy model, TMR, SIL3; Large-scale general loop (fan / pump frequency conversion)

II. Usage Instructions (Wiring + Configuration + Maintenance)

1) Wiring (with 2481 substrate, single-ended isolation)

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

CHx+ → Actuator +

CHx- → Actuator-

SHD → Shielding layer (single-ended grounding)

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

CHx+ → Signal +

CHx- → Signal-

GND → System ground

2) Configuration (TriStation Trident)

Hardware slot selection: AO2481

Channel Parameters: Output Type → 4–20mA / 0–10V

Range → Corresponding range

Set fault safety value (FVD), read monitoring, alarm threshold

Download configuration, module restart takes effect

3) Fault troubleshooting

FAULT red and bright + CHx yellow flashing: Channel open circuit / short circuit / overload → Check wiring, load resistance, actuator

OK not lit: Backplane power supply, firmware, TMR synchronization failure

Output drift / inaccurate: Check load impedance, shielding grounding, interference source, calibration