Product Overview

The Honeywell 8C-TAOXA1 (51307135-175) is a high-reliability Analog Output Termination Assembly (IOTA) belonging to the Experion PKS Series 8 I/O family. As a fundamental component of the C300 control environment, this IOTA provides the physical mounting base and field wiring interface for the 8C-PAOXA1 Analog Output module. The 8C-TAOXA1 is designed to support 16 channels of 4-20 mA signals, commonly used to drive control valves, actuators, and speed governors in critical process industries such as oil and gas, power generation, and pharmaceutical manufacturing. Its vertical form factor is a signature of the Series 8 design, engineered to promote natural convection cooling and minimize the footprint within high-density control cabinets.

Technical Configuration

The 8C-TAOXA1 (51307135-175) architecture is optimized for rapid installation and long-term signal integrity in demanding industrial settings.

• 16-Channel Capacity: Provides dedicated screw terminal points for 16 analog output loops, supporting both redundant and non-redundant configurations.

• Vertical Mounting Profile: Specifically designed for the Series 8 Slim chassis, allowing for efficient cable management and superior thermal dissipation compared to traditional horizontal racks.

• G3 Conformal Coating: The 51307135-175 variant is factory-treated with a protective coating to withstand Class G3 harsh environments, preventing corrosion from H2S, Cl2, and other caustic gases.

• Integrated Power Distribution: Manages the distribution of 24 VDC power from the cabinet bus to the inserted I/O module and the field-side loop, ensuring consistent drive current across all 16 channels.

• Field Wiring Interface: Features robust, high-density compression terminals that facilitate secure connections for field cabling, with integrated support for shield grounding.

Technical Specifications

Technical FAQs

Is the 8C-TAOXA1 compatible with HART communication modules?

Yes. While the IOTA is a passive termination assembly, it is designed to transparently pass HART digital data when paired with an Analog Output module that supports HART (such as the 8C-PAOHA1).

What is the significance of the 51307135-175 part number?

The 175 suffix specifically denotes the G3 conformal coating. Standard, non-coated versions carry different suffixes. This version is required for any installation where the control room atmosphere is not strictly regulated for corrosive contaminants.

Can I use this IOTA for redundant AO module configurations?

The 8C-TAOXA1 is a non-redundant (Single) IOTA. For redundant applications where two modules back up one another on the same field wiring, you must use the redundant version of the IOTA (8C-TAOXB1).

Engineering & Installation Guide

• Wiring Discipline: When connecting 4-20 mA loops to the 8C-TAOXA1, ensure that signal cables are kept separate from high-voltage AC lines. Use twisted-pair shielded cables and terminate the shield at the IOTA designated ground point to minimize electromagnetic interference (EMI) that can cause valve hunting.

• Module Seating: Before applying power, ensure the 8C-PAOXA1 module is fully seated onto the IOTA and the captive mounting screws are tightened. A loose module can cause intermittent Channel Fault or I/O Link Failure alarms in the Experion System Status Display.

• Atmospheric Protection: Since this is the 51307135-175 G3-coated version, ensure that when field wiring is completed, the cabinet entries are sealed. The coating protects the board, but terminal connections remain vulnerable to heavy oxidation if the cabinet is left open in a corrosive environment.