Product Core Brief
- Model: PM802F
- Full OEM Part Code: 3BDH000002R1
- Brand: ABB
- Series: AC 800F Freelance distributed process control CPU base unit family
- Core Function: Serve as the central processing core for ABB Freelance DCS systems; execute IEC61131-3 control logic, continuous PID regulation, interlock sequence control, data acquisition from field I/O, and multi-protocol communication between operator stations, field instruments and third-party equipment. Supports full controller redundancy for uninterrupted process operation.
- Product Type: Modular rack-mount hot-swappable main CPU base unit (integrated power input + CPU core + expansion slot backplane)
- Key Specs: 32-bit RISC processor | 4 MB battery-backed RAM / 4 MB Flash EPROM | Dual Ethernet expansion slots + 4 fieldbus expansion slots | Redundancy sync support | Lithium battery data retention ⚠️ EOL — limited surplus stock remaining
Product Introduction
The ABB 3BDH000002R1 is the entry standard main controller for ABB AC800F Freelance DCS, widely deployed in thermal power, chemical, water treatment and oil & gas process plants. It scans analog/discrete I/O via CAN bus, PROFIBUS DP or Modbus, runs closed-loop control algorithms independently without upper server reliance, and communicates with operator HMI stations over industrial EthernetABB Group.This unit differs from higher-performance PM803F by smaller 4MB RAM/Flash capacity, suited for medium-scale racks with up to ~1000 I/O points; PM803F features expanded memory for large complex plant control systems. OEM field logging records a 58,000 hour MTBF under steady 50 °C control cabinet runtime.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Compatible DCS Platform | ABB Freelance AC 800F; interoperable with S700 rack I/O, S800 field I/O, PROFIBUS/Modbus field instruments |
| Official Full Part Number | 3BDH000002R1 (short designation ) |
| Main Processor | 32-bit Intel 80960HD super-scalar RISC, up to 150 MIPS computing capacityManualsLib |
| Memory Configuration | 4 MB battery-buffered static RAM; 4 MB Flash EPROM for program storage; 16 Kbit serial EEPROM |
| Data Retention | 3.6 V lithium buffer battery; multi-year RAM data hold during full power loss |
| Operating Power Supply | Dual input options: 115/230 VAC universal AC, or dual redundant 24 VDC DC feed |
| Power Consumption | Typical 6 W; maximum 7.8 W under full fieldbus expansion loadManualsLib |
| Expansion Slot Layout | 2 slots for Ethernet communication modules; 4 slots for PROFIBUS DP / Modbus / CAN fieldbus adapters |
| Supported Protocols | Modbus RTU/TCP, PROFIBUS DP V1, CAN (Freelance rack I/O), IEC60870-5 telecontrol, FOUNDATION Fieldbus HSE |
| Redundancy Support | Dual controller hot standby; dedicated Ethernet sync link for seamless master/slave switchover |
| Hot Swap Compliance | AC800F certified hot-swap; rack internal CAN I/O bus stays operational during base unit replacement |
| Onboard Diagnostics | Internal temperature monitoring, dual rail voltage watchdog, program run/fault LED indicators, battery low alarm |
| Mechanical Mount Format | Standard 19-inch DIN rail modular rack form factor, single full-width base unit housing |
| Mechanical Dimensions | 300 mm L × 180 mm W × 85 mm D |
| Net Unit Weight | 1.6 kg empty base unit |
| Continuous Operating Ambient Temp | -20 °C to +60 °C full rated control performance; linear performance derate above 60 °C |
| Storage Temperature Range | -40 °C to +85 °C, 5–95 % RH non-condensing |
| Enclosure Rating | IP20 front panel, indoor control cabinet installation only |
| Integrated Protection Circuits | AC/DC input surge clamping, internal 5 V/3.3 V undervoltage automatic reset, hardware watchdog fault recovery |
| Certifications | UL, CE, RoHS, EN61000 Class A industrial EMC filtering for process power facilities |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Cross-reference serial numbers against ABB Freelance OEM trace databases; inspect front status LED banks for dead segments, rack edge connectors for oxidation, lithium battery terminals for corrosion. Photograph rear power and expansion slot pinout for plant cabinet wiring reference.
- Live Functional Test: Mount the base unit into a populated AC800F test rack paired with PROFIBUS DP communication modules and mixed S800 AI/DI/AO/DO I/O; run a continuous 24-hour cyclic PID and interlock logic test with simulated 4–20 mA transmitters and dry contact inputs. Log AC/DC supply voltage stability with a Fluke 115 digital multimeter for the full test duration.
- Electrical Parameter Test: Perform a 500 V Megger insulation resistance test between all communication field circuits and controller chassis ground; pass threshold set at >10 MΩ. Verify dual redundant DC power input seamless switchover with zero control loop interruption.
- Firmware & Redundancy Verification: Read and record factory control firmware revision via Freelance Engineering Tool software; document default Ethernet IP subnet and PROFIBUS baud rate register settings for site commissioning reference. Test master/standby controller hot swap switchover timing.
- Final QC & Packaging: Wipe rack edge connectors to remove oxidation; seal the unit inside anti-static foam sleeve, affix a dated QC Pass label listing all communication, self-test, memory retention and insulation test metrics before rigid shock-resistant carton packing.
Replacement Pitfall Guide
❗ ❗ Partial Rack Slot Insertion Risk: Uneven base unit seating creates high-resistance backplane contact points that throttle Ethernet/fieldbus throughput and delay PID loop execution during critical process heat/pressure transients. Push the unit fully into the DIN rack slot and engage front locking latches flush against the rack faceplate.❗ Ethernet/Fieldbus Cable Shield Ground Misconfiguration Risk: Unshielded CAT5e trunk wiring routed parallel to high-current generator excitation cabling injects EMI noise that causes intermittent DCS I/O data loss. Use factory shielded Ethernet and PROFIBUS DP assemblies, terminate shield ground at only the main DCS cabinet terminal block end.❗ ❗ Uncontrolled ESD Damage Risk: Dry central control room air builds static charge rapidly. Touch a grounded anti-static mat for three full seconds before handling rack edge connectors and expansion slot ports; ungrounded contact destroys low-tolerance Ethernet transceiver ASICs.Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
Compatibility Matrix
- PM803F high-memory AC800F CPU base unit → : Needs Adaptation — full DCS control logic rewrite required to reduce memory usage and adjust firmware addressing routines
- ABB S700 rack I/O modules → : Direct — internal CAN backplane bus natively exchanges discrete/analog signal data
- ABB S800 field terminal I/O bases → : Direct — communicates via PROFIBUS DP or Modbus RTU fieldbus adapters installed in expansion slots
- VM310 24 V cabinet auxiliary power supply → : Direct — regulated 24 V DC output matches the unit’s dual DC input operating voltage window without extra voltage conditioning
- ABB UFC760BE42 AC800PEC power electronics CPU → : Needs Adaptation — add Modbus TCP gateway hardware to bridge generator excitation system fiber bus to AC800F plant Ethernet backbone
- CML40.2-SP-330-NA-NNNN-NW Rexroth SERCOS motion PLC → : Needs Adaptation — wire module global CPU fault dry contacts to PLC digital inputs, map process loop setpoint registers via Modbus TCP polling
