Description
ABB UAC326AE01 HIEE401481R0001 Combined Analog/Digital I/O Card
Product Introduction
In a generator excitation system, the I/O hardware sits directly between the control logic and the electrical signals that have to be measured, supervised, or acted upon. The ABB UAC326AE01 HIEE401481R0001 is identified by ABB as the UA C326 AE01 Combined I/O used within the UNITROL P excitation platform. ABB’s spare-parts documentation specifically lists it as a Combined I/O component and identifies two units per UNITROL P system.
This makes the UAC326AE01 a system-specific excitation-control spare, not a generic S800-style I/O module. Available ABB product data identifies HIEE401481R0001 as UA C326 AE01: Analog/Digital I/O Card, while third-party listings provide conflicting channel counts and electrical specifications. For replacement work, the safest approach is therefore to match the complete ABB part number, board revision, UNITROL P configuration, connectors, and system drawings rather than relying on generic online specifications.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model / Type Designation | UA C326 AE01 |
| Part Number | HIEE401481R0001 |
| Common Ordering Designation | UAC326AE01 |
| Product Type | Combined I/O / Analog-Digital I/O Card |
| Primary Application | ABB UNITROL P excitation system |
| System Function | Excitation-system input/output interface |
| ABB Spare-Parts Description | Combined I/O |
| Quantity per UNITROL P Unit | 2 |
| Product Origin | Switzerland is shown in ABB product data |
| Net Weight | Approx. 0.35 kg |
| Gross Weight | Approx. 0.45 kg |
| Product Net Dimensions | ABB product record lists 29 × 29 × 29 mm; verify against physical packaging/board documentation |
| Operating Voltage | Verify from applicable UNITROL P documentation |
| Analog I/O Channel Count | Verify exact board revision/system documentation |
| Digital I/O Channel Count | Verify exact board revision/system documentation |
| Communication Protocol | Not established as a standalone network interface |
| Operating Temperature | Verify from UNITROL P system documentation |
| Protection Rating | System/cabinet dependent |
| Mounting | Internal UNITROL P equipment installation |
| Configuration | Application-specific |
ABB’s product record explicitly identifies the item as UA C326 AE01: Analog/Digital I/O Card, with HIEE401481R0001 as the product ID. ABB’s UNITROL P spare-parts flyer gives the more application-specific description Combined I/O and lists two units per system.
Application Scenarios & Engineering Considerations
UNITROL P Excitation Systems
The clearest documented application is ABB’s UNITROL P excitation platform. ABB’s own spare-parts documentation lists the UAC326AE01 alongside the processing unit, gate control unit, power pack, converter electronics, measuring interfaces, binary fieldbus coupler, and other UNITROL P components.
This is useful procurement information because it establishes where the card belongs in the system architecture. It should not be confused with a general-purpose plant PLC I/O module.
UAC326AE01 HIEE401481R0001
Generator Excitation Control
The card’s position within UNITROL P places it in the signal path associated with excitation-system control and monitoring. In practical maintenance work, this means the card should be evaluated together with the processing unit, gate-control hardware, measuring interfaces, and power electronics rather than in isolation.
A replacement should be checked against the installed UNITROL P cabinet documentation before the equipment is energized.
Excitation-System Maintenance
The UAC326AE01 is particularly relevant when maintaining an installed UNITROL P system where replacing the entire excitation controller is unnecessary or undesirable. ABB’s spare-parts documentation identifies the card as a recommended spare for one UNITROL P unit, with two pieces used in that system.
For procurement, retain both identifiers:
HIEE401481R0001
Do not reduce the description to simply “ABB I/O card.”
Legacy System Spare Management
Older excitation equipment often contains several visually similar electronic assemblies. The exact ABB identification is therefore more useful than a generic description such as “analog/digital board.” A board with a similar physical form factor can still have different signal assignments or system compatibility.
Related Products
The following components are documented by ABB in the UNITROL P spare-parts architecture and are useful for system-level identification. They are not automatic substitutes for :
- PP C322 BE1 — HIEE300900R0001 — Processing Unit
- GD B021 BE1 — HIEE300766R0001 — Gate Control Unit
- KU C321 AE1 — HIEE300698R0001 — Power Pack
- UNS 3670 V2 — HIEE205011R0002 — Converter Electronics
- UNC 4672a-P V1 — HIEE205012R0001 — Measuring Interface
- UNC 4673a-P V1 — HIEE205014R0001 — Measuring Interface
- UP C090 AE1 — HIEE300661R0001 — Binary Field Bus Coupler
- UF C092 B1 — HIEE300910R0001 — 16-fold Binary Input
- AR C093 A1 — HIEE300690R0001 — 16-fold Output Relay
- UA C096AE1 — HIEE300794R0001 — Analog Input/Output Module
These relationships come from ABB’s UNITROL P spare-parts documentation.
Engineer’s Guide: Field Pitfalls to Avoid
1. Do not confuse “Combined I/O” with a generic PLC I/O card
ABB’s formal description is UA C326 AE01: Analog/Digital I/O Card, while the UNITROL P spare-parts documentation calls it Combined I/O. Its application is therefore tied to the excitation-system architecture.
2. Do not trust conflicting channel-count specifications
Several reseller pages publish channel counts for this part, but the numbers conflict substantially. One source claims 16 input/16 output channels, while another reports 8 analog inputs and 4 analog outputs; another gives 16 analog inputs and 8 analog outputs.
Those figures should not be used as engineering specifications without the applicable ABB drawing or manual.
3. Do not assume a 24 VDC specification is proven
Some third-party listings state 24 VDC, but ABB’s available product record does not establish that as the standalone operating specification. For an excitation system, use the UNITROL P wiring documentation and actual cabinet drawings.
4. Check the host UNITROL P configuration
ABB identifies two cards per UNITROL P unit. Before replacement, identify which board position is being serviced and compare the connector and wiring arrangement.
5. Inspect the complete label
The procurement record should contain both:
If the physical label shows another suffix or revision, stop and reconcile it with the system documentation before installation.
6. Do not substitute by physical appearance
A visually similar ABB excitation-system PCB can belong to a different signal function. The UNITROL P spare-parts list includes separate measuring interfaces, binary input hardware, relay outputs, fieldbus couplers, and analog I/O hardware. Connector compatibility alone is not sufficient evidence of interchangeability.
FAQ
What is ABB ?
is ABB’s UA C326 AE01 Combined I/O / Analog-Digital I/O Card, identified by product number . ABB specifically lists it as a UNITROL P spare component.
Is a PLC I/O module?
It is better classified as an excitation-system I/O card rather than a conventional PLC I/O module. Its documented system context is ABB UNITROL P.
Where is used?
ABB’s own spare-parts documentation identifies it as a Combined I/O component for UNITROL P excitation equipment, with two pieces used in one UNITROL P unit.
How many analog and digital channels does it have?
A reliable ABB source located for this exact part does not provide a channel breakdown. Third-party listings conflict, reporting different analog and digital channel configurations. The channel assignment should therefore be taken from the applicable UNITROL P engineering documentation.
Can replace another ABB I/O card?
Not based on the general “I/O card” description alone. The UNITROL P spare-parts list contains several different I/O-related assemblies, including UA C096AE1, UF C092 B1, AR C093 A1, and the . Exact part-number and system compatibility must be confirmed.
What should be checked before purchasing?
Confirm the designation, product number, board revision, physical label, connector arrangement, UNITROL P model/configuration, and actual condition. If the application is a running generator excitation system, obtain the applicable cabinet drawing and I/O documentation before approving a substitution.
Is the still available?
ABB’s product data identifies as an ABB product and shows it in the product record. However, current commercial availability and exact factory supply status should be verified at the time of procurement rather than inferred from third-party stock listings.
