I. Core Positioning

AO3481 is a key control output card of the Tricon system, installed in the I/O slots of the mainframe / expansion rack; it adopts a triple redundancy (TMR) architecture, receiving digital instructions from the system, precisely converting them into industrial standard analog signals, and driving on-site actuators. It is the core execution end of SIS/ESD safety interlock and process control.

II. Specifications and Parameters (Official Standard Version)

1. Basic Specifications

Model: 3481 (AO3481) Analog Output Module

Number of Channels: 8 isolated analog outputs, channel-to-channel / channel and bus isolation

Output Signals (Each Channel Programmable):

Current: 4–20mA (overrange 0–22mA)

Voltage: 0–10V

Resolution: 16 bits

Accuracy: ±0.1% of full scale (25℃)

Refresh Rate: Programmable per channel (typical 10ms)

Load Capacity:

Current: ≤ 600Ω

Voltage: ≥ 1kΩ

2. Redundancy and Communication

Architecture: TMR triple redundancy, three-channel synchronous output, voting, single-point failure without disturbance

Data Processing: Triple-link data comparison, automatic shielding of faulty channels, no output interruption

Backplane Communication: Tricon dedicated high-speed bus, real-time data interaction

3. Electrical and Isolation

Isolation: 1500VAC channel - channel, channel - system isolation, anti-common-mode interference

Anti-interference: Electromagnetic shielding, surge suppression, signal filtering, suitable for strong interference sites

Power Supply: Backplane 24VDC (±10%), typical 120mA

Power Consumption: Approximately 10 watts

4. Environment and Reliability

Operating Temperature: -40℃ ~ +70℃ (SIS wide temperature standard)

Storage Temperature: -55℃ ~ +85℃

Humidity: 5%–95%, no condensation

Vibration: 10–150Hz, 0.1g sine wave

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

Hot Swap: Supports online insertion and removal for replacement, without interrupting the system operation

5. Mechanical and Indicator Lights

Size: 225 × 112 × 40mm (standard Tricon I/O size)

Weight: Approximately 1.3kg

Indicator Lights:

PWR (Green): Module power supply is normal

OK (Green): Triple redundancy output link is normal

FAULT (Red): Output abnormal, overrange, open circuit or module failure

CH1–CH8 (Green): Corresponding channel output is normal

III. Main Features

High Precision Control: 16-bit resolution, ±0.1% accuracy, meeting precise adjustment requirements

Triple Redundancy Safety: TMR architecture, three-channel independent output voting, single-point failure does not affect control

Channel Isolation Design: 1500VAC isolation, eliminating on-site interference and ground potential difference influence

Flexible Signal Adaptation: Each channel can be configured with 4–20mA or 0–10V, compatible with mainstream actuators

Comprehensive Fault Diagnosis: Channel open circuit / short circuit, overrange, link abnormal real-time detection and reporting

Industrial-grade Durability: Wide temperature, strong anti-interference, hot swap, suitable for high-risk and harsh sites

System Seamless Compatibility: TriStation configuration software online configuration, monitoring, calibration, and debugging are convenient

IV. Typical Application Scenarios

Chemical Plants: Reaction tank temperature / pressure regulating valve, distillation tower liquid level / flow control loop

Oil and Gas Industry: Oilfield / natural gas station regulating valve, compressor anti-surge control, emergency shut-off valve control

Power Stations: Boiler feedwater valve, steam turbine speed regulating valve, flue gas denitration / desulfurization actuator control

Coal Chemical Plants: Gasification furnace oxygen-coal ratio regulating, purification device liquid level / pressure control SIS Security System: Emergency shutdown for high-risk processes, safety isolation, redundant control of critical actuators

Process Control: Precise output of analog control signals in the DCS/SIS integrated system