ABB PM902F (Order No. 3BDH001000R0005) is a standard central processing unit module for the Freelance AC 900F distributed control system (DCS). As the core unit of the entire control system, it is responsible for executing control logic, processing real-time data, conducting system diagnostics, and enabling full network communication with host computers, I/O modules and field devices. A mid-range performance CPU in the ABB Freelance series, the PM902F 3BDH001000R0005 is specifically designed for medium-to-large process control and factory automation applications in industries such as petroleum, chemical, power, water treatment and manufacturing. It features high-performance computing, abundant communication interfaces, high reliability and flexible scalability, supports redundant architecture, and can operate in harsh industrial environments.
Technical Parameters
- Product Model: PM902F
- Order Number: 3BDH001000R0005
- Processor: PowerPC RISC architecture, 800 MHz main frequency
- System Memory:
- Total Memory: 24 MB
- Battery-Backed SRAM: 8 MB (data retention upon power loss)
- Dynamic DRAM: 16 MB
- I/O Capacity: Supports up to approximately 1,500 I/O points (subject to application configuration)
- Communication Interfaces (ABB Group):
- Ethernet: 4 × 10/100 Mbps ports (supports Modbus TCP, IEC 60870, PROFINET, etc.)
- Serial Ports: 2 × RS-232/RS-485 (switchable)
- Diagnostic Interface: 1 × dedicated debugging port
- Communication Slots: 2 × CI (Communication Interface Module slots, supports PROFIBUS DP, CANopen, etc.)
- Storage Expansion: Supports SD card (for program backup, firmware upgrade, and data logging) (ABB Group)
- Display Unit: Optional 64×128 dot-matrix LCD (for local status monitoring)
- Power Requirement: 24 V DC ±20%, power consumption 约 10 W
- Physical Specifications:
- Dimensions (W×H×D): 227 × 152 × 95 mm
- Weight: Approximately 1.1 kg
- Mounting: Standard DIN rail
- Environmental Indicators:
- Operating Temperature: -25°C ～ +60°C
- Storage Temperature: -40°C ～ +85°C
- Protection Class: IP20
- Corrosion Resistance: Optional G3 anti-corrosion coating
- Certifications: CE, UL, and RoHS compliant
Main Functions & Advantages
High-Performance Real-Time Control
The 800 MHz processor ensures fast scan cycles (minimum 5 ms cyclic tasks).Supports three task modes: cyclic execution, event-driven operation, and full-speed running.Efficiently handles complex control algorithms (PID, logic, sequential control) with low task-switching latency.
Comprehensive Communication Capability
The 4-port Ethernet design supports redundancy, multi-network segments, and parallel connections to host computers, servers, and field devices.Dual serial ports are compatible with various instrument and subsystem protocols; 2 CI slots enable fieldbus expansion.Seamless integration with industrial Ethernet and mainstream fieldbuses for high system integration.
Highly Reliable Industrial Design
8 MB battery-backed memory preserves critical programs and data permanently during power loss.Supports CPU redundancy, power redundancy, and communication redundancy, eliminating single points of failure on critical links.Wide temperature range, anti-interference, and high shock resistance, suitable for harsh industrial sites with strong electromagnetic interference and corrosion.
Flexible Expansion & Ease of Use (ABB Group)
Supports direct local connection of up to 10 S700 I/O modules and distributed deployment of remote I/O.Fully compatible with IEC 61131-3 programming languages (Ladder Diagram, Function Block Diagram, Structured Text, etc.).Graphical programming via ControlBuilder software, one-click backup/restore, and online diagnostics.
Strong Application Adaptability
Covers process control, factory automation, energy management, smart grid, and other fields.Cost-effective for medium and large-scale systems; can be used standalone or networked to form a complete DCS solution.
Application Scenarios
Process IndustryUnit control, closed-loop regulation of temperature, pressure, and flow in chemical, refining, and petrochemical plants.
Power & EnergyAuxiliary equipment control in thermal/hydropower plants, substation automation, load optimization in smart grids.
Water TreatmentAutomatic control of pumps, valves, and water quality parameters throughout the process in municipal wastewater and water supply plants.
ManufacturingLogic control, drive coordination, and high-speed interlocking for production lines in papermaking, metallurgy, and building materials.
InfrastructureBuilding HVAC, district energy systems, tunnel and utility corridor monitoring systems.
Frequently Asked Questions (FAQ)
Q1: What are the core differences between PM902F, PM901F and PM904F?A1: All three belong to the ABB Group AC 900F series:
- PM901F (Lite): Entry-level, 3 Ethernet ports, 16 MB memory, no redundancy, suitable for small systems.
- PM902F (Standard): Standard-level, 4 Ethernet ports, 24 MB memory, 2 CI slots, supports redundancy, the mainstream selection.
- PM904F (Plus): High-performance, 4 Ethernet ports, 48 MB memory, 4 CI slots, larger I/O capacity, for complex large-scale projects.
Q2: What do the suffix differences such as 3BDH001000R0005 and R0001 represent?A2: The suffixes indicate hardware versions / configuration variants:
- 3BDH001000R0001: Early standard basic version
- 3BDH001000R0005: Current mainstream upgraded version (optimized firmware, improved compatibility, minor hardware adjustments)
Functions and core parameters are identical; they are mutually compatible and replaceable (firmware version matching required).
Q3: How long can data be retained in the 8 MB battery-backed memory during a power failure?A3: With the standard lithium battery at 25°C, data retention is ≥ 6 months. For long-term shutdowns, regular power-up or battery replacement is recommended.
Q4: What is the maximum number of remote I/O supported by PM902F? What about the communication distance?A4:
- Local: Direct connection of up to 10 S700 I/O modules
- Remote: Dozens of remote stations expandable via PROFIBUS DP / CANopen
- Distance: Ethernet ≤ 100 m (twisted pair) / multi-mode fiber ≤ 2 km; PROFIBUS DP ≤ 1200 m
Q5: How is CPU redundancy configured? What is the switchover time?A5:
- Redundant station built with dual PM902F modules, operating synchronously in hot standby mode
- Bumpless switchover ≤ 100 ms upon failure, with no interruption to the control process
- Requires redundant baseplate, synchronization cable, and redundancy function enabled in ControlBuilder
Q6: How to perform program backup and firmware upgrade?A6:
- Backup: Insert SD card → trigger via local LCD or software → full project / parameter backup
- Upgrade: Load firmware via SD card → online / offline update → automatic verification without losing user programs
- Supports system recovery via SD card even without battery or under power-off conditions
Q7: How to quickly diagnose module faults?A7:
- Local: Error codes shown on LCD + status LEDs (RUN/ERR/COM indicators)
- Remote: ControlBuilder diagnostic page → fault codes, logs, channel status, communication quality
Common faults: abnormal power supply, memory checksum errors, Ethernet link disconnection, incompatible CI modules.
Q8: Is PM902F compatible with the older AC 800F system?A8:
- Hardware is not directly compatible (different baseplates and I/O modules)
- Software projects can be converted using the ControlBuilder version migration tool
- New projects are recommended to adopt the AC 900F architecture; legacy systems can be upgraded step by step.
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