PM902F ABB Freelance AC 900F CPU Processor Module
Manufacturer: ABB
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Part Number: PM902F
Condition：New with Original Package
Product Type: CPU Processors
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
ABB PM902F Freelance AC 900F CPU Module
Configured for high-speed logic processing and deterministic network communication in Freelance AC 900F control networks, the ABB PM902F 3BDH001000R0001 (PM902F Processor Module) provides direct physical/electrical execution.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PM902F |
| Brand | ABB |
| Origin | Germany / Sweden |
| Weight | Standard DCS module weight |
| Dimensions | Standard AC 900F rack dimensions |
| Operating Temp | Standard industrial ambient range |
| Power Consumption | External 24 VDC required |
| Controller Family | Freelance AC 900F |
| CPU Clock Speed | 800 MHz |
| Onboard Memory | 24 MB total (8 MB SRAM, 16 MB DRAM) |
| Communication Ports | 4x Ethernet ports, 2x expansion slots |
| Protocol Support | Modbus TCP, IEC 60870-5-104 |
| Performance Execution | 0.12 ms per 1000 Boolean operations |
| Conformal Coating | G3 harsh environment coating |
| Mounting Type | Panel or rack mount |
Backplane Bus Communication Velocity and Network Determinism
The processor executes complex control loops while driving backplane bus communication velocity across localized I/O modules and external expansion racks. Integrated Ethernet ports utilize deterministic network protocols to ensure low-latency packet transmission between redundant CPU nodes and operator stations. Onboard 8 MB battery-buffered SRAM maintains retentive registers during main power drops, while internal flash memory structures preserve firmware flash compatibility across Freelance software versions starting from version 2013 onward.
Frequently Asked Questions
Q: Does the PM902F support hot-swapping during active redundant operations?
A: Yes. When deployed in a dual redundant AC 900F rack setup, field engineers can replace a faulty CPU module without interrupting the online controller or disrupting active I/O communication.
Q: How is application data retained during a complete 24 VDC power loss?
A: The module relies on the optional TA 951F battery unit to power the 8 MB SRAM bank, retaining application state parameters and retentive memory blocks throughout power outages.
Q: Can expansion communication interfaces be added while the module is powered?
A: No. Power must be isolated from the base rack before inserting or removing interface modules into the two dedicated communication slots to prevent backplane pin damage.
Field Installation Guidelines
Mount the CPU assembly onto a grounded panel or standard AC 900F rack inside a sealed enclosure. Connect the primary external 24 VDC supply to the designated power terminals using stranded copper conductors, observing correct polarity. Route all four Ethernet network cables through dedicated wiring channels separate from high-voltage AC lines to mitigate electromagnetic noise. Attach cable shielding firmly to the cabinet ground bar using low-impedance grounding clamps to ensure proper noise suppression.