Description
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | NF93A-2 |
| Main Part Number | HESG440280R2 |
| PCB Reference | HESG323662R1 |
| Additional PCB Reference | HESG216665/K |
| Product Type | System interface / coupling module |
| System Association | ABB Procontrol P13 / legacy control systems |
| Primary Function | Signal/interface conditioning and coupling |
| Installation | Procontrol rack/backplane |
| Communication | System dependent |
| I/O Configuration | System dependent |
| Supply Voltage | Verify against original system documentation |
| Firmware | Revision/application dependent |
| Hardware Revision | R2 |
| Environmental Rating | Verify from applicable ABB installation documentation |
Product Overview
The ABB NF93A-2 HESG440280R2 is a legacy ABB control-system module associated with the Procontrol P13 family used in power-generation and industrial automation installations. The complete assembly is commonly identified by HESG440280R2, with HESG323662R1 and HESG216665/K appearing as associated board references.
The ABB NF93A-2 is described in available technical references as a network/filter or coupling module. Its role is therefore better understood as part of the Procontrol system’s internal interface and signal-conditioning architecture rather than as a modern standalone PLC controller.
The ABB HESG440280R2 should be sourced as an exact legacy assembly. Current reseller databases contain conflicting descriptions, including claims that it is an AC 800M controller, digital-input module, and general-purpose PCB. Those descriptions are not consistent with the stronger Procontrol-oriented identification.
Main Features & Field Considerations
Procontrol system compatibility
The NF93A-2 is repeatedly listed alongside other ABB Procontrol components, including AB91-1, IT94-3, and IW93-2. This supports its classification as legacy Procontrol hardware rather than an AC 800M controller.
NF93A-2
Filter/coupling function
The most specific available description identifies the NF93A-2 as a network/filter/coupling module, associated with signal conditioning and protection of the Procontrol system interface.
Multiple board identifiers
For procurement, retain all markings found on the original assembly:
- NF93A-2
- HESG440280R2
- HESG323662R1
- HESG216665/K
The latter two references can help verify the internal PCB revision when examining a replacement.
Legacy replacement risk
Do not approve an alternative merely because the supplier describes it as an “ABB controller” or “digital input module.” The available sources demonstrate that generic descriptions for this part are unreliable.
Important Specification Warning
I found major conflicts in secondary-market specifications for this part.
One source describes HESG440280R2 as a Procontrol network/filter/coupling module. Another claims it is an AC 800M controller with Ethernet ports, CPU memory, and Control Builder support. Yet another lists it as a digital input module.
These descriptions are mutually incompatible. I would therefore not publish unsupported channel counts, 24 VDC I/O specifications, Ethernet interfaces, CPU speed, memory capacity, or AC 800M compatibility for .
Replacement Checklist
Before replacing ABB , verify:
- Exact module designation:
- Assembly number:
- PCB number: HESG323662R1
- Additional PCB marking: HESG216665/K
- Procontrol system generation
- Rack and slot position
- Adjacent modules
- Backplane arrangement
- Hardware revision
- Wiring and connector configuration
- Original board photographs
- System documentation
Procurement Description
ABB — Procontrol P13 Legacy Network / Filter / Coupling Module, Associated PCB HESG323662R1 / HESG216665/K
For a like-for-like replacement, specify the complete + identification and use the PCB markings to confirm the assembly. Because public listings contain materially incorrect functional descriptions, the installed rack configuration should be verified before accepting any substitute.
