Description
Product Introduction
The ABB DI93A HESG440355R3 is a legacy ABB industrial automation component identified by the model designation DI93A and part number HESG440355R3. It appears in industrial automation spare-parts catalogs alongside other ABB legacy control-system hardware, including HESG-series boards and modules.
There is an important identification issue with this particular part. Secondary sources do not consistently agree on its function. One product listing specifically describes DI93A HESG440355R3 as an ABB Processor Unit, while another describes the same part as an ABB power board. Because no authoritative ABB technical document confirming the detailed function was located in the available search results, specifications such as processor architecture, input/output channels, supply voltage, communication protocols, and memory should not be presented as confirmed facts.
For procurement, the correct approach is to identify the hardware using both DI93A and HESG440355R3, then compare the board revision, connectors, installed system, and original cabinet documentation. This is especially important with older ABB equipment, where similar-looking boards can perform completely different functions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | DI93A |
| Part Number | HESG440355R3 |
| Product Type | Legacy ABB industrial automation module |
| Secondary Classification | Processor Unit / Power Board |
| Hardware Family | ABB HESG-series hardware |
| Application | Industrial automation and control |
| System Compatibility | Configuration dependent |
| Supply Voltage | Verify from original ABB documentation |
| Communication Interface | Verify from system documentation |
| I/O Configuration | Verify from hardware documentation |
| Processor | Not reliably confirmed |
| Operating Temperature | Verify from original documentation |
| Mounting | System/rack dependent |
| Hardware Revision | R3 |
The R3 suffix should be treated as part of the identification. I would not substitute another DI93 or HESG440355 variant without confirming the original system configuration.
DI93A HESG440355R3
Main Features and Engineering Considerations
Legacy ABB system integration is the main consideration with this component. The DI93A is not a current-generation ABB S800 I/O module such as DI810 or DI840; it belongs to an older hardware ecosystem and should be evaluated within its original control-system architecture.
Dual identification is important. The combination + HESG440355R3 provides a much stronger procurement reference than the short model number alone. This is particularly useful when dealing with used, refurbished, or surplus inventory.
Functional verification is essential. The conflicting descriptions found online—Processor Unit versus Power Board—show why generic product listings should not be used as the sole engineering reference.
For a replacement, the supplier should provide photographs of the complete board, including:
- Front and rear PCB
- Manufacturer label
- designation
- marking
- Connector layout
- Revision markings
- Any firmware/EPROM labels
Application Scenarios
The ABB is relevant to:
- Legacy ABB industrial automation systems
- ABB control-system maintenance
- Older process-control installations
- Industrial power-control equipment
- Plant modernization and retrofit projects
- Obsolete-system spare-parts management
- Repair and refurbishment of ABB control hardware
It is listed in ABB-oriented industrial spare-parts inventories together with other HESG-series components, supporting its role as a legacy automation spare.
Engineer’s Guide: Field Pitfalls
⚠️ Do not publish unverified processor specifications.
One reseller calls a Processor Unit, but that does not establish the CPU type, memory, operating system, or processing capability.
⚠️ Do not assume it is a power board either.
Another source calls the exact part a power board. The conflicting classifications mean the physical board and system documentation should be checked before assigning a technical function.
⚠️ Verify the exact revision.
The complete identification is:
Do not approve a replacement solely because it is marked “.”
⚠️ Check the host system.
For obsolete ABB equipment, the installed rack, controller, firmware, I/O architecture, and board revision can determine whether a replacement is actually usable.
⚠️ Require functional testing.
A refurbished unit should be tested in an appropriate ABB-compatible test setup. A simple continuity or power-on test is not enough to establish functional equivalence.
Frequently Asked Questions
What is ABB ?
It is a legacy ABB industrial automation component identified as , with ABB part number . Secondary sources classify it inconsistently as a processor unit or power board.
Is a processor module?
One secondary source identifies it as a Processor Unit, but this classification could not be independently confirmed from an authoritative ABB technical document.
Is a power supply board?
One source describes it as a power board, but this also remains insufficiently documented to treat as a definitive technical classification.
What should I verify before purchasing?
- Board revision
- PCB label and connector layout
- Host ABB system
- Rack/backplane compatibility
- Firmware or memory devices
- Supply requirements
- Original system documentation
- Functional test report
Procurement recommendation: For this particular part, I would request a clear board photograph and the equipment/system model where it is installed before approving a substitute. The online technical identification is not consistent enough to safely infer the detailed specifications from the part number alone.
