The Allen-Bradley T8431 is a high-performance TMR analog input module for industrial safety systems.

This unit provides 40 isolated input channels for precise analog signal measurement and monitoring.

It uses a fully triplicated, fault-tolerant circuit design to ensure high system availability.

The module supports both voltage and current input types for wide application flexibility.

It offers high resolution and accuracy for critical process monitoring in hazardous locations.

The T8431 carries multiple hazardous-area certifications for safe use in demanding environments.

Regular self-testing maintains long-term reliability and reduces unexpected system failures.

Its compact form factor fits standard Trusted chassis for easy system integration.

The T8431 operates from a system supply voltage range of 20 to 32V dc.

It supports an input voltage range of 0–6 Vdc and a current range of 0–22 mA.

This module provides 40 independent analog input channels for field signal acquisition.

Users can configure up to 4 user-defined threshold levels for alarm and fault detection.

Signal resolution reaches 3.9uA, equivalent to 1/256mA for highly precise measurements.

Safety accuracy is rated at ±1% of full scale for reliable safety-related performance.

Calibration accuracy is as high as 0.03%, ensuring stable and precise long-term operation.

The recommended interval for input channel calibration checks is set at 2 years.

Sample update time for the T8431 is only 0.5 ms for real-time signal processing.

Event resolution for sequence of events is 1 ms with time-stamp accuracy of ±0.5 ms.

The module features a fault-tolerant, fully triplicated circuit with optional line monitoring.

Channel-to-channel crosstalk ranges from -40 dB to -60 dB for strong signal isolation.

Field common isolation supports ±250V dc working voltage and ±2.5kV dc withstanding voltage.

Power consumption ranges from 15 W to 18 W with a nominal rating of 20 W.

Self-test interval for the module is fixed at 2 minutes to ensure continuous health monitoring.

Real-time clock resolution is 100 µSec for accurate time-stamping of field events.

The T8431 holds Ord/HazLoc, ATEX and IECEx certifications for hazardous area use.

Operating temperature for the T8431 ranges from -5°C to 60°C.

Non-operating storage temperature spans from -25°C to 70°C.

Temperature change rate must not exceed 0.5°C per minute during operation.

Operating humidity is 10–95% RH, non-condensing for stable environmental performance.

Full environmental details are available in reference document 552517.

Module height measures 266 mm, with a width of 31 mm and depth of 303 mm.

Total weight of the T8431 unit is 1.149 kg, or 2.5 lbs for shipping calculations.

The module is designed for standard rack mounting in Trusted TMR system chassis.

Install the T8431 into an available slot in a compatible Trusted TMR chassis.

Always power off the chassis before inserting or removing the analog input module.

Align the module firmly with the backplane connector to avoid pin damage.

Connect field analog sensors and transmitters to the designated input terminals.

Ensure proper field wiring isolation to maintain high common-mode rejection performance.

Set user-defined thresholds based on your process monitoring and safety requirements.

Verify input signal levels stay within 0–6Vdc or 0–22mA for correct operation.

Check module status indicators after power-up to confirm normal initialization.

Maintain proper cabinet ventilation to keep the module within its temperature range.

Follow intrinsic safety guidelines when using external barriers for hazardous locations.

1 × Allen-Bradley T8431 Analog Input Module

1 × Set of Mounting Hardware

1 × Terminal Connector Assembly

1 × Installation and Configuration Guide

1 × Technical Datasheet

The T8431 is widely used in safety instrumented systems across process industries.

It monitors pressure, temperature, level and flow signals in oil, gas and chemical plants.

Fully triplicated design reduces risk of signal loss or faulty measurement in critical operations.

High-speed sampling and time-stamping support accurate sequence-of-events recording.

Strong isolation protects the control system from field-side electrical noise and surges.

The module complies with strict safety standards for SIL-rated control architectures.

Its low power consumption and compact design support dense I/O configurations.

Regular self-testing helps maintain compliance with international safety standards.

The T8431 integrates smoothly with Trusted TMR controllers and expansion chassis.

It ensures stable, accurate and safe analog signal acquisition in long-term operation.