Description

The Honeywell 8C-PAIH54 (Part Number 51307070-275) is a conformal coated Differential Analog Input Module with HART designed for process measurement and monitoring in Experion LX Series 8 control systems. Operating within the Series 8 I/O architecture, the module interfaces differential 4-20 mA DC transmitter signals and HART digital communications directly to the C300 controller across the system I/O Link.

The module provides 16 differential input channels and features a factory-applied conformal coating (8C- prefix) to protect electronic circuitry against moisture, dust, chemical contaminants, and environmental harshness. It mounts directly onto an Input Output Termination Assembly (IOTA), eliminating the need for a separate electronic card chassis. Field wiring is landed on removable two-level terminal blocks on the IOTA, which also handles internal field power distribution.

The 8C-PAIH54 supports both non-redundant and hardware-redundant control configurations when combined with the appropriate IOTA board (8C-TAIDA1 or 8C-TAIDB1). Redundancy is implemented directly on the IOTA base without external switchover logic or special interconnect cables by attaching a second IOM. Secondary and tertiary HART variables along with device diagnostic status are transferred continuously to support process execution and asset maintenance.

Features

• 16 differential analog input channels handling standard 4-20 mA DC currents and HART digital protocol communications.
• Conformal coated circuit board assembly (8C- series designation) for severe environment protection.
• Direct plug-in mounting onto Series 8 Input Output Termination Assemblies (IOTA), bypassing card cages.
• Support for non-redundant (8C-TAIDA1) and redundant (8C-TAIDB1) termination assemblies.
• Short-circuit protected input channel architecture to shield electronics against field wiring faults.
• On-board field power distribution routed through the IOTA board to reduce external marshalling terminals.
• Visual status indicator area on the front cover for quick operational checks.
• Vertically mounted enclosure with an angled heat-dissipation layout for thermal management in dense cabinets.

Applications

• Differential pressure, flow, and level transmitter measurement loops in continuous process control.
• HART smart field device monitoring for real-time asset management and secondary variable collection.
• Signal acquisition in harsh atmospheric environments where conformal coating is mandated.
• Redundant analog input monitoring for critical control execution in Experion LX architectures.

Ordering Information

Technical Specifications

General

Electrical

Environmental

Compliance and Certifications

Connections / Interfaces

Installation Guidelines

1. Confirm that system power is disconnected before installing or servicing modules in hazardous locations.
2. Secure the compatible IOTA assembly (8C-TAIDA1 or 8C-TAIDB1) vertically to the cabinet channel.
3. Ensure the enclosure chassis is grounded using at least #8 AWG solid copper conductor.
4. Align the rear connectors of the 8C-PAIH54 module with the standard receptacle on the IOTA and push firmly.
5. Tighten the two mounting screws on each side of the module cover to secure it to the IOTA board.
6. Observe proper electro-static discharge (ESD) handling procedures, including grounding wrist straps.

Configuration and Commissioning Recommendations

1. Define channel parameters, differential ranges, and HART variable assignments within Control Builder software.
2. Verify transmitter loop power connections and polarity against the IOTA field terminal layout.
3. Save controller configuration and parameter backups prior to module insertion or hardware swapping.
4. Verify signal readings and HART communication status for each active input channel prior to process startup.