ABB PM902F AC 900F Freelance DCS Processor Module

Technical Specifications 32‑bit RISC industrial real‑time processor runs at 800 MHz clock frequency. RAM capacity is 64 MB, flash memory is 128 MB for firmware, application and data logging storage. Supports SD‑card slot for program backup and firmware upgrade. Nominal power supply 24 V DC, allowable input voltage range 19.2‑30 V DC. Typical power consumption 10 W. Operating temperature range ‑25 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Equipped with four 10/100 Mbps Ethernet ports, two switchable RS‑232/RS‑485 serial ports, dedicated diagnostic service port, two CI‑module expansion slots. Supports direct connection of maximum ten S700 I/O modules.

Functional Features Executes full IEC61131‑3 standard programming languages for Freelance DCS process automation. Supports 1+1 hot‑standby controller redundancy for bumpless switch‑over upon primary unit fault. Comprehensive hardware self‑diagnosis monitors CPU, memory, power circuit and all communication channels. Lithium backup battery preserves RAM process‑variable data after main power supply loss. Real‑time clock provides high‑precision time stamp for alarm, event and historical log records.

Application Scenarios Core standard controller unit for Freelance DCS system in power plant, oil‑gas, chemical industry, pulp‑paper and water‑treatment automation cabinet. Used for single non‑redundant controller setup and high‑availability redundant controller configuration. Directly connects S700 series I/O modules, expands remote I/O via fieldbus communication modules. Integrates with DigiVis operator station for process monitoring, historical‑data recording and alarm management.

Installation Requirements Slide PM902F module onto standard DIN‑rail inside control cabinet until locking mechanism clicks fully. Wire 24 V DC power supply to module power terminal strictly following polarity marking. Attach S700 I/O modules sequentially onto module rear‑side backplane interface, complete mechanical locking for every I/O unit.