ABB HAI805 | 8-Channel HART Analog Input | Symphony Plus DCS Integration

Key Technical Specifications

ABB’s documentation specifies eight independently configured HART channels and eight dedicated HART modems. It also specifies redundant HN800 communication to Symphony Plus controllers and support for remote placement through fiber-optic repeaters.

Product Introduction

The ABB HAI805 is an 8-channel analog input module designed to bring 4–20 mA/HART field transmitters into an ABB Symphony Plus control system. Unlike a conventional analog input card that primarily delivers the current measurement, HAI805 provides individual HART communication for every channel, allowing intelligent transmitter information to be used by control, alarm, maintenance, and engineering functions.

For plant operators, the main advantage is access to more field-device information without adding a separate HART multiplexer architecture. ABB specifically states that secondary, tertiary, and quaternary HART variables can be made available to real-time control applications.

Application Scenarios & Field Pitfalls

Engineering Pain Point

Replacing a HAI805 with an ordinary 4–20 mA analog input module can preserve the primary process signal while losing HART communication and device-level diagnostic data. That distinction matters when the existing control strategy uses transmitter variables beyond the primary measurement.

Typical Applications

• Process transmitters: pressure, differential pressure, temperature, flow, and level transmitters using 4–20 mA/HART.
• Power generation: boiler, turbine, balance-of-plant, and auxiliary process instrumentation.
• Chemical and petrochemical plants: intelligent transmitter integration with Symphony Plus control applications.
• Water and utility systems: centralized process measurement with HART-based device diagnostics.

Technical Pitfalls to Avoid

1. Do not confuse HAI805 with a generic 8-channel analog input card. Its dedicated HART modem architecture is a key part of the module’s function.
2. Verify the ITU805 base. ABB’s product documentation specifies HAI805 for use with the ITU805 mounting base.
3. Check HN800 compatibility and system revision. The module communicates with Symphony Plus controllers through the HN800 architecture, so replacing it outside the supported S+ I/O configuration is not simply an electrical wiring change.

Related Products

• ABB HAO805 — 8-channel HART analog output module; intended for HART-capable control outputs rather than transmitter inputs.
• ABB ITU805 — Dedicated mounting/interface base associated with HAI805 and HAO805.
• ABB HPC800 — Symphony Plus controller that communicates with S+ HART I/O through the HN800 architecture.
• ABB PNI800 — Symphony Plus plant-network interface module; serves a different network-level role from HAI805.
• ABB PDP800 — PROFIBUS interface for the HPC800-based Symphony Plus architecture.
• ABB IOR810 — Symphony Plus I/O-related interface/repeater equipment used where system architecture requires extended communication infrastructure.
• ABB RFO810 — Fiber-optic repeater used to extend Symphony Plus I/O communication over longer distances.

Procurement Check

For an HAI805 replacement, verify the complete module identification, ITU805 base, HN800 system configuration, controller/software revision, and the existing HART channel assignments. If the plant depends on secondary or tertiary HART variables, confirm those variables are actually configured in the control application before declaring the replacement equivalent. The HAI805’s value is not just its eight current inputs; it is the combination of 4–20 mA acquisition and eight independent HART communication paths.