Triconex AIH3273X - 8-Channel HART-Compatible Analog Input Module for TriStation Safety Controller

Triconex AIH3273X – 8-Channel HART-Compatible Analog Input Module for TriStation Safety Controller

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Product Introduction:
The Triconex AIH3273X is an 8-channel analog input module specifically designed for HART (Highway Addressable Remote Transducer) communication. This module accepts 4-20mA analog signals from field transmitters while simultaneously supporting HART digital communication for configuring and diagnosing the transmitters remotely. The “AIH” designation stands for Analog Input with HART capability, while “3273X” identifies the specific channel configuration and revision. This module is used in safety-critical applications where both the analog process variable and the digital diagnostics from the transmitter are required for safety decisions. The HART protocol allows operators to read secondary variables (like temperature, pressure, and diagnostics) from the same 4-20mA loop used for the primary safety signal.

Technical Specifications:
Board Type: Analog Input Module with HART
Channels: 8 independent analog input channels
Input Signal: 4-20mA, 2-wire HART compatible
Resolution: 16-bit A/D conversion
Accuracy: +/- 0.1% of full scale
HART Protocol: HART 7 compliant (1200 baud FSK)
Isolation: 1500V RMS channel-to-channel and channel-to-ground
Update Rate: 250 milliseconds per channel (HART polling)
Diagnostics: Supports HART device diagnostics (burst mode, continuous mode, automatic mode)
Voting: 2-out-of-3 hardware voting with other redundant modules
Power: 24V DC from I/O carrier
Form Factor: 3U Triconex Eurocard

Functional Features:
HART Communication: Supports all standard HART commands for reading primary and secondary variables, device status, and diagnostics.
Simultaneous Analog and Digital: Reads the 4-20mA safety signal and HART digital data at the same time, providing both process value and device health.
Per-Channel Configuration: Each channel can be independently configured for input range, filtering, and HART polling mode.
Burnout Detection: Automatically detects open transmitter wires (burnout) and alarms the safety processor.
Self-Diagnostics: Continuous self-test of A/D converters, HART modem, and isolation barriers.
Fail-Safe Output: On communication loss, the module drives the safety processor input to a predetermined safe value (typically 3.6mA or 21mA depending on configuration).

Application Scenarios:
Process Safety Monitoring: Reads HART-enabled pressure transmitters and temperature transmitters in refineries and chemical plants for safety shutdown logic.
Remote Diagnostics: Allows maintenance engineers to read transmitter diagnostics (like sensor health, impulse line blockage) from the control room via HART.
Redundant Measurement: Used in safety-critical loops where both the analog value and the transmitter status are required for safe operation.
Calibration Verification: Uses HART to verify transmitter calibration without physically accessing the field device.

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