Description
ABB PM802F 3BDH000002R1 | AC 800F Basic Unit | Freelance 800F Controller
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | PM802F |
| Order Number | 3BDH000002R1 |
| Product Type | AC 800F Basic Unit / Central Unit |
| System | Freelance 800F |
| RAM | 4 MB static RAM |
| RAM Protection | Battery-buffered |
| Flash-EPROM | 4 MB |
| CPU Architecture | Super-scalar RISC processor |
| CPU Performance | Up to 150 MIPS |
| Internal CPU Cache | 16 KB |
| Fieldbus Module Slots | 4 |
| Ethernet Module Slots | 2 |
| Diagnostics | Internal monitoring and watchdog |
| Dimensions | Approx. 239 × 202 × 164 mm |
| Net Weight | Approx. 1.6 kg |
ABB’s product documentation specifies 4 MB static RAM for PM802F and 4 MB Flash-EPROM, while PM803F uses 16 MB RAM and 8 MB Flash-EPROM. The distinction is important when selecting a replacement.
The basic unit provides four slots for fieldbus modules and two slots for Ethernet communication modules. Depending on the installed configuration, the AC 800F architecture can therefore accommodate different fieldbus and Ethernet interfaces rather than having all communication interfaces permanently built into the PM802F itself.
Product Introduction
The ABB PM802F 3BDH000002R1 is the central basic unit of the AC 800F controller used in ABB Freelance 800F systems. It cyclically processes signals received through installed fieldbus modules, executes the configured application program, and sends control commands back toward field devices through the corresponding communication modules.
The PM802F uses 4 MB battery-buffered static RAM and provides four fieldbus-module positions plus two Ethernet-module positions. Controller redundancy can be implemented by installing two AC 800F units, according to ABB’s Freelance documentation.
PM802F 3BDH000002R1
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
When an older Freelance controller starts producing memory, watchdog, communication, or startup faults, replacing the is not simply a matter of matching the enclosure and order number. The installed fieldbus modules, Ethernet modules, application software, firmware, memory configuration, and controller redundancy arrangement all affect whether a replacement will operate correctly.
Typical Applications
- ABB Freelance 800F DCS installations
- Process-control systems using AC 800F controllers
- Legacy plant automation maintenance
- Controller replacement during planned shutdowns
- Redundant AC 800F controller architectures
Technical Pitfalls
- Do not confuse with PM803F.
Both belong to the AC 800F basic-unit family, but provides 4 MB RAM, while PM803F provides 16 MB RAM. Their memory configurations are not interchangeable simply because the chassis format is similar. - Check the complete controller configuration.
The is the central unit; fieldbus and Ethernet functionality depends on the modules installed in its available slots. Record every installed F-slot and E-slot module before replacement. - Preserve the application configuration.
The basic unit is supplied without the complete plant-specific application configuration. A replacement controller should not be treated as a drop-in solution until the required operating system, application, and controller configuration have been confirmed. ABB’s catalog documentation notes that the operating system must be installed during software installation. - Check the battery-backed memory condition.
The uses battery-buffered RAM. For an old spare, battery condition and retention should be checked before placing the unit into service. - Verify the power-supply arrangement.
The basic unit is used with separate AC 800F power-supply hardware. ABB documentation lists SA811F for 115/230 VAC and SD812F for 24 VDC applications. Do not assume the itself is the system power supply. - Redundancy requires system-level matching.
If the installation uses redundant AC 800F controllers, verify the primary/secondary configuration and associated communication hardware before replacing one controller.
Related Products
- ABB PM803F — 3BDH000530R1 — AC 800F basic unit with 16 MB RAM; higher-memory alternative within the same basic-unit family.
- ABB SA811F — 3BDH000013R1 — AC 800F power supply for 115/230 VAC applications.
- ABB SD812F — 3BDH000014R1 — AC 800F 24 VDC power supply.
- ABB EI813F — 3BDH000021R1 — Ethernet interface module for AC 800F.
- ABB FI810F — AC 800F fieldbus interface for CAN applications.
- ABB FI820F — AC 800F serial fieldbus interface.
- ABB FI830F — AC 800F PROFIBUS interface.
- ABB FI840F — AC 800F FOUNDATION Fieldbus HSE interface.
- ABB EI801F — AC 800F Ethernet communication module.
- ABB RW855F — contact rail associated with the AC 800F basic-unit installation.
Procurement Note
For 3BDH000002R1, match the exact order number, not simply “AC 800F CPU.” Before approving a replacement, record the installed F1–F4 and E1–E2 modules, controller redundancy arrangement, software/firmware information, and the condition of the battery-backed memory.
One particularly important distinction is versus PM803F: the former is the 4 MB version, while the latter uses 16 MB RAM. For a legacy Freelance installation, that memory difference should be treated as a compatibility check rather than a cosmetic variant.
