Brief Product Description

ABB PM803F, order code 3BDH000530R1, is the 16MB battery buffered RAM base CPU unit for ABB Freelance DCS AC800F field controller. It adopts 32-bit RISC processor architecture, supports cyclic control task as low as 5ms. This base unit is delivered without preloaded operating system; the Freelance OS must be downloaded during commissioning, requires Freelance software V7.1SP2a or above. It supports optional controller redundancy, can handle around 1000 I/O points, works with S800 I/O modules and multiple fieldbus interfaces. ABB has discontinued this product. Only fully tested surplus and refurbished units are available for legacy Freelance DCS maintenance, spare replacement and plant retrofit projects.

Product ID:3BDH000530R1

ABB model name :PM 803F

Table of Contents :PM 803F Base Unit 16 MB

Detailed description :PM 803F, Base Unit 16 MB, battery-buffered RAM

Product net depth: 164 millimeters

Product net height: 202 millimeters

Product net width :239 millimeters

Net weight of the product: 1.6 kilograms

Core Product Functions

• AC800F field controller base unit for ABB Freelance distributed control system
• 16MB battery-backed SD-RAM for control program and process data retention upon power loss
• 32-bit RISC CPU, configurable cyclic task cycle starting from 5ms
• Support redundant controller hot standby configuration for high availability process loops
• Onboard station CAN bus, Ethernet, expandable for PROFIBUS-DP, Modbus TCP, FF fieldbus modules
• Compatible with S800 remote I/O series, supports approx. 1000 I/O signals per controller
• Requires Freelance OS download, software version V7.1SP2a or higher mandatory
• Onboard LED status indicators for run, fault, communication and diagnostic information
• Modular rack structure, can mount power supply and communication modules on the same subrack

Application Scenarios

• Legacy ABB Freelance AC800F DCS main process controller cabinet
• Power plant boiler, auxiliary system, steam turbine auxiliary control
• Chemical, refinery, water & wastewater plant continuous process control
• Oil & gas, pulp & paper, cement industry distributed process automation
• Metallurgy, pharmaceutical batch and continuous process control
• Legacy Freelance DCS controller spare replacement, maintenance and system retrofits

FAQ (Frequently Asked Questions)

• Q: Controller fails to start after installing PM803F?
  A: Confirm Freelance software version ≥V7.1SP2a, download the matching operating system, check backup battery health, subrack power supply, backplane connection and module status LEDs.
• Q: What is the difference between PM803F and PM802F?
  A: PM803F performance is slightly lower (5~10%) than PM802F; PM802F is older obsolete model, PM803F is its successor base unit.
• Q: Can PM803F run without battery?
  A: It can run normally when powered on, but RAM program and data will be lost after power failure, battery is required for data retention.
• Q: What I/O system matches PM803F?
  A: Works with ABB S800 series I/O modules via PROFIBUS or station bus.

• Q: Is ABB PM803F available for new DCS projects?
  A: End-of-life product, no new original production. Recommend migration to AC900F controller. Only surplus/refurbished tested spares for existing Freelance systems.

3BDH000530R1.pdf