The technical parameters of the ABB PM902F Process Station AC900F are as follows:

1. CPU Module

• Model: PM902F
• Type: Central Processing Unit (Standard)
• Memory:
  • 24 MB controller memory
  • 8 MB battery-buffered SRAM
  • 16 MB DRAM
• I/O Capacity: Supports up to 1500 I/O points
• Slots: 2 slots for communication interface modules
• Operating System: Not included; must be loaded during software installation
• Software Requirement: Requires version 2013 or higher

2. Interfaces

• Ethernet Interfaces: 4 Ethernet interfaces (ETH1 to ETH4, with ETH4 not available on PM901F)
• Serial Interfaces: 2 serial interfaces (SER1 and SER2)
• Diagnostic Interface: 1 diagnostic interface (DIAG)
• Power Supply: External 24 VDC power supply required

3. Communication

• Fieldbus Support: Supports PROFIBUS, CAN bus, and other fieldbus protocols
• Redundancy: Optional redundancy configuration available
• Max Communication Interfaces: Up to 4 fieldbus communication interfaces

4. Physical Specifications

• Dimensions:
  • Net Depth: 95 mm
  • Net Height: 152 mm
  • Net Width: 227 mm
• Weight: 1.1 kg
• Cooling: Convection cooling without temperature derating

5. Environmental Compliance

• RoHS Compliance: Adheres to EU Directive 2011/65/EU and amendments 2015/863
• WEEE Category: 5 (Small equipment with dimensions not exceeding 50 cm)

6. Power Supply

• Voltage: 24 VDC
• Power Connection: Removable 5-pin terminal block for power supply lines

7. Expansion and Connectivity

• I/O Bus: Direct connection for I/O modules
• Coupler Bus: For connecting additional modules (C1-C4 slots available on PM904F)
• SD Card Slot: For easy controller backup and firmware updates

8. Display and Control (Optional)

• Display Unit: TD 951F (optional, not included)
• LED Indicators: Status LEDs for power, communication, and operation

9. Configuration and Memory

• Main Memory: Includes error detection/correction
• Memory Allocation:
  • Operating system memory
  • Object directory memory (number of objects * 16 bytes)
  • Configuration data memory (PRAM)
  • Redundancy memory (for redundant stations only)
  • Working data memory (RAM)

10. Applications

• Primary Use: Central unit in the Freelance AC900F controller series
• Suitable For: Industrial automation, process control, and distributed control systems (DCS)