ABB PM904F 3BDH001002R0001
ABB PM904F 3BDH001002R0001
ABB PM904F 3BDH001002R0001
ABB PM904F 3BDH001002R0001
ABB PM904F 3BDH001002R0001

ABB PM904F 3BDH001002R0001 | Central Processing Unit for AC900F Controller

  • Brand: ABB
  • Model: PM904F 3BDH001002R0001
  • Product Type: CPU Module
  • Series: AC900F (Freelance DCS)
  • Core Function: Executes control logic, manages data processing/communication, and provides system diagnostics for industrial automation.
  • Key Specs: Dual-core PowerPC processor (800MHz), supports redundant configuration, 4x Ethernet ports, up to 1500 I/O points.
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Part number: ABB PM904F 3BDH001002R0001
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Description

PM904F 3BDH001002R0001: Product Overview
This component is the central processing unit (CPU) for ABB’s AC900F controller series, a core element of the Freelance distributed control system (DCS). Its position in an automation system is to serve as the primary controller, residing in the control cabinet and interfacing with I/O modules, operator stations, and engineering tools. It orchestrates all critical functions, from executing user-defined control logic (e.g., PID loops, sequential control) to managing real-time data exchange with field devices and supervisory systems.
The core functionality involves processing analog/digital I/O signals, running control algorithms, and handling communication via multiple protocols. It supports dual-core processing for multitasking, enabling simultaneous execution of control logic, data logging, and network communication. The module also performs system diagnostics, monitoring processor load, memory usage, and communication health, and triggers alerts for faults like over temperature or power loss.
This CPU belongs to the AC900F product family, a platform recognized for its modularity, high availability, and compliance with industrial standards (IEC 61131-3, IEC 61508). Benefits include reduced commissioning time through standardized configuration tools, seamless integration with S800 I/O modules, and flexible redundancy options (dual-module hot standby) to minimize downtime. The platform’s scalable architecture allows adaptation from small machines to large plant-wide systems.

ABB PM904F 3BDH001002R0001

ABB PM904F 3BDH001002R0001

PM904F 3BDH001002R0001: Technical Specifications
  • Model Number: PM904F 3BDH001002R0001
  • Manufacturer: ABB
  • Product Type: CPU Module
  • Processor: Dual-core PowerPC, 800MHz
  • Memory: 256MB RAM, 64MB Flash (expandable via SD card)
  • Redundancy: Supports dual-module hot standby (switch time <50ms)
  • Communication Ports: 4x 100Mbps Ethernet, 2x RS232, 1x USB 2.0
  • Fieldbus Support: PROFIBUS-DP, Modbus TCP/IP, OPC UA, IEC 61850 (via coupling modules)
  • I/O Capacity: Up to 1500 I/O points (with S800 I/O expansion)
  • Power Supply: 24V DC (18-32V DC range)
  • Operating Temperature: -40°C to +70°C
  • Storage Temperature: -40°C to +85°C
  • Dimensions: 135mm (H) x 100mm (W) x 85mm (D)
  • Weight: 0.8kg
  • Certifications: CE, UL, IEC 61508 SIL3, IEC 60068-2-6 (vibration)
Core Features & Customer Value​
Dual-core processing enhances multitasking capability. The 800MHz PowerPC cores allow concurrent execution of control logic, data logging, and network communication, preventing scan time overruns in complex processes. For engineers, this enables implementation of advanced algorithms (e.g., model predictive control) without compromising system responsiveness. For end-users, it translates to tighter process control and higher throughput.
Redundant configuration ensures high availability. The dual-module hot standby setup synchronizes data between active and standby CPUs via fiber/copper links. In the event of a primary CPU failure, the standby takes over within 50ms, maintaining uninterrupted control. This is critical for continuous processes like power generation or chemical refining, where downtime incurs significant costs.
Flexible communication interfaces simplify integration. Four Ethernet ports support high-speed connections to operator stations and SCADA systems, while RS232/USB ports enable legacy device integration and configuration. Optional coupling modules extend support to PROFIBUS, Modbus, and IEC 61850, eliminating the need for protocol converters. For system integrators, this reduces wiring complexity and accelerates commissioning.
Modular I/O expansion adapts to evolving needs. The CPU supports up to 1500 I/O points via S800 I/O modules, including analog/digital inputs/outputs and specialty modules (e.g., pulse counters). Engineers can scale the system incrementally without overhauling the architecture, protecting long-term investments. The rugged design (-40°C to +70°C operating range) ensures reliability in harsh environments like steel mills or offshore platforms.

ABB PM904F 3BDH001002R0001

ABB PM904F 3BDH001002R0001

Typical Applications​
In a combined-cycle power plant, this CPU controls a gas turbine’s fuel valve and exhaust temperature via S800 analog I/O modules. It executes PID loops to maintain turbine speed, communicates with the plant DCS via IEC 61850 for remote monitoring, and logs operational data for compliance reporting.
For a petrochemical reactor, the module manages temperature/pressure interlocks using digital I/O and Modbus TCP. It triggers emergency shutdowns if parameters exceed setpoints, while redundant configuration ensures no loss of control during maintenance.
In a municipal water treatment plant, it regulates pump speeds via PROFIBUS-DP-connected VFDs, adjusts chemical dosing based on pH sensor feedback, and interfaces with the SCADA system for remote setpoint adjustments.
In an automotive assembly line, the CPU synchronizes welding robots using high-speed Ethernet, monitors weld quality via analog inputs, and logs cycle times for production analytics.

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