ABB PM902F 3BDH001000R0001 Freelance AC 900F CPU Module

Description

Key Technical Specifications

• Article Number: 3BDH001000R0001
• CPU Clock Speed: 800 MHz
• Controller Memory: 24 MB (total flash/program)
• Battery-Buffered SRAM: 8 MB
• DRAM: 16 MB
• Ethernet Interfaces: 4 built-in (typically for control network, engineering, redundancy)
• Serial Ports: 3 × RS-232C
• I/O Capacity: Up to 1500 I/O points (typical configuration)
• Expansion Slots: 2 slots for additional communication modules
• Power Supply: 24 V DC ±10% (max ~2.5 A draw, typical 1.8 A)
• SD Card Support: Built-in for data logging and firmware
• Operating Temperature: -20 to +60 °C (standard industrial; verify enclosure)
• Mounting: DIN-rail or panel in Freelance rack
• Weight: Approximately 1.2–1.5 kg (including base)

PM902F 3BDH001000R0001

Product Introduction

The ABB PM902F (3BDH001000R0001) is the medium base CPU module in the Freelance AC 900F distributed control system family. It serves as the central processor for mid-sized process automation applications in industries like chemicals, pharmaceuticals, power, and water treatment, handling logic execution, I/O management, and communication with field devices.

This unit provides solid performance with an 800 MHz processor, ample memory for complex control strategies, and native support for multiple Ethernet ports plus redundancy options. Engineers select it over smaller PM901F variants when I/O counts exceed 400–500 points or when faster scan times and more connectivity are required, all while staying within the proven Freelance toolset for engineering and diagnostics.

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation (15–20 minutes) ⚠️ Safety First: Notify operations of downtime. Place controller in safe state. Lock out/tag out 24 V power. Wait 5 minutes for discharge. Tools Required: ESD wrist strap, PH1 screwdriver, multimeter, wire labels, smartphone for photos. Data Backup: Use Freelance Control Builder to export the project (including application code, hardware config, and parameters). Document IP addresses, redundancy settings, and any optional module configs. Photograph front panel LEDs, Ethernet connections, and battery status.

Stage 2: Removing the Old Module (10 minutes)

1. Power down the controller rack.
2. Remove front cover or bezel.
3. Label and disconnect Ethernet cables, serial if used, and power leads carefully.
4. Release mounting clips/levers and pull module straight out—protect backplane pins.
5. Inspect rack bus for dust or damage; clean as needed. ⚠️ Note: Keep the old CPU on ESD mat for reference until new one is commissioned fully.

Stage 3: Installing the New Module (15–20 minutes)

1. Ground with ESD strap. Confirm exact match to PM902F (3BDH001000R0001).
2. Configuration Clone (Crucial): No DIP switches typically; most settings are software. Insert battery if not pre-installed (match polarity). Seat any existing expansion modules in slots.
3. Insert firmly into rack until locked.
4. Reconnect cables using labels; torque to spec (0.5–0.6 Nm). Self-Checklist: [ ] Model/revision exact, [ ] Battery installed/connected, [ ] Cables secure, [ ] Slots/modules match.

Stage 4: Power-On & Testing (20–30 minutes) Pre-Power Check: Multimeter for no shorts on 24 V input. Power-On Steps:

1. Apply power to controller only (isolate field I/O).
2. Observe LEDs: Power green, RUN green (after boot), no major ERR.
3. Connect Control Builder via Ethernet; verify CPU detection, firmware version, and project compatibility.
4. Download project if required (or restore from backup).
5. Test communications, I/O scan, and basic loops in simulation or dry-run mode. ⚠️ Troubleshooting Note: Boot failure or ERR LED? Check battery voltage (>3 V), power stability, or project/firmware mismatch. No Ethernet link? Verify IP config and cable/switch.

Frequently Asked Questions (FAQ)

Is the PM902F hot-swappable? No. Power down the controller before swapping. Live insertion risks corrupting the backplane bus or losing active control in redundant setups.

Is this model obsolete, and is the stock genuinely new? As of 2026, PM902F remains in ABB’s Freelance portfolio with active support and listings on the hardware selector—no obsolescence notice yet for this CPU. Stock is new surplus from OEM excess or project spares—traceable, anti-counterfeit checked, and load-tested 24+ hours on Freelance racks. Test reports and photos on request.

What is the direct replacement if this is out of stock? Stay within Freelance: PM904F offers higher capacity if needed. For migration, consider AC 800M or newer 800xA controllers, but that requires re-engineering. Verify I/O and fieldbus compatibility before any swap.

Will I lose my application logic or configuration when swapping? No—the program resides in battery-buffered SRAM and flash. After swap, download the project or let it auto-load from backup. Export first to avoid any risk; battery failure during swap is the main gotcha.

Why is the price lower than ABB factory direct? New surplus from decommissioned or overstocked systems—no markup for new production. Full QC includes visual inspection, power-up tests, memory verification, and burn-in. Delivers identical performance with our 1-year warranty.

Does this support controller redundancy? Yes—PM902F supports system bus redundancy when paired with a second unit and appropriate config in Control Builder. Use for high-availability loops where single-point failure isn’t acceptable.