MC-TAIH12 | Honeywell | High Level Analog Input/STI FTA for Redundancy (16 Inputs)

Product Overview

The MC-TAIH12 is a high-integrity High Level Analog Input (HLAI) Field Termination Assembly (FTA) engineered for the Honeywell Experion PKS and TPS/TDC 3000 ecosystems. Specifically designed to support redundant configurations, this FTA interfaces with the MC-PAIH03 High Level Analog Input Processor to provide 16 high-accuracy differential input channels. Supporting Smart Transmitter Interface (STI), the module allows for advanced digital communication with 2-wire or self-powered field transmitters. It is widely deployed in safety-critical oil and gas, refining, and power generation applications where continuous data availability and fault tolerance are mandatory.

Comprehensive Technical Parameter Matrix

The following data represents the core engineering specifications for the MC-TAIH12 when paired with the MC-PAIH03 processor, optimized for technical procurement and system design.

Advanced Signal & Redundancy FAQ

How does the MC-TAIH12 ensure "Non-Stop" operation during a failover?The MC-TAIH12 architecture is unique in that no input scan cycles are missed or delayed during a processor swap or failover. The hardware is designed so that the failure of one redundant processor has no nominal effect on accuracy (max +/- 2% FS in extreme conditions), ensuring that critical PID loops remain stable and process visibility is never lost.

What is the benefit of the STI (Smart Transmitter Interface)?The STI capability allows the MC-TAIH12 to handle digital data from smart field devices. This enables remote calibration, advanced status diagnostics, and secondary variable tracking without requiring additional field wiring, significantly reducing maintenance overhead.

How is the power conditioned for field transmitters?For the MC-TAIH12 model, transmitter power is conditioned via Resistor Current Limiting (145 Ohm). This design is optimized for Class 1, Div 2 hazardous area interfacing, providing a safe current-limited supply without the need for traditional fuses, which simplifies the module's footprint.

Field Engineering & Installation Protocol

• Low-Side Common Jumper: By default, the low-side input is connected to the system common via a wire jumper on the FTA. For specific floating-ground applications, this jumper can be removed, provided the user ensures the operation remains within the Common Mode Voltage (CMV) spec of -6 to +5 V peak.

• Redundancy Cable Integrity: When deploying in a redundant configuration, ensure the cables connecting the MC-TAIH12 to the dual MC-PAIH03 processors are securely latched. Because the FTA manages the signal split, any cable impedance imbalance can affect the common-mode rejection performance.

• Termination Torque: Use high-quality twisted-pair shielded cables for the 16 differential inputs. Tighten the compression terminals securely but avoid over-torquing, which can damage the high-level input path. The shield should be grounded only at the FTA to prevent ground loops.

Technical Superiority & Application Resilience

The Honeywell MC-TAIH12 is built for extreme reliability in harsh industrial environments, rated for operation between 0 to 50 deg Celsius. Its high-resolution 16-bit A/D converter provides the precision necessary for custody-transfer level flow measurements and sensitive pressure monitoring. As an Original and New component, it features a single-pole RC normal mode filter with a -3 dB response at 1 Hz, effectively stripping away high-frequency industrial noise. Its ability to withstand up to +/- 30 V on any input without damage ensures that field wiring errors or electrical surges do not compromise the expensive control system backbone.