The PM904F acts as a centralized control hub, processing real-time data from field devices, executing control logic, and facilitating communication between different system layers. By supporting protocols like Modbus TCP, PROFIBUS DP, and IEC 60870-5-104, it bridges the gap between legacy and modern infrastructure, enabling interoperability across diverse industrial ecosystems. Its dual-core PowerPC processor and 48 MB of memory ensure rapid response times, critical for applications such as turbine control, batch processing, and emergency shutdown systems. Whether deployed in a standalone controller or a redundant configuration, the PM904F empowers industries to optimize efficiency, reduce downtime, and enhance safety.

Label	Specification
Model Number	PM904F
Brand	ABB
Type	CPU Module (Freelance AC 900F Series)
Input Voltage	19.2–32.5 V DC (-20% to +35%)
Operating Temperature	-20°C to +70°C
Communication Methods	Ethernet (4 ports), RS 232/485, PROFIBUS, CAN
Mounting	Rack-mounted (IP20-rated enclosure)
Weight	0.9 kg
Certifications	CE, cULus, EAC, ISA 74.01 G3
Dimensions	175 mm x 100 mm x 125 mm (W x H x D)
IP Rating	IP20 (controller cabinet), IP54/IP65 for field I/O cabinets
Protocols Supported	Modbus TCP, IEC 60870-5-104, PROFIBUS DP, CAN
Memory	16 MB battery-backed SRAM + 32 MB DDR-RAM

The ABB PM904F redefines industrial control through its advanced architecture and robust features. Its dual-core PowerPC processor (800 MHz) delivers deterministic real-time performance, ensuring precise control over critical processes like gas turbine synchronization or chemical reactor monitoring. The module’s four communication slots allow for flexible expansion, supporting up to four PROFIBUS or CAN interfaces, making it ideal for integrating legacy equipment with modern automation systems.

• PM902F – A standard CPU module with two communication slots, suitable for mid-sized applications requiring up to 1,800 I/O points .
• PM901F – A lite version with reduced memory and three Ethernet ports, ideal for small-scale systems with basic control needs .
• CI930F – A PROFIBUS communication interface module compatible with the PM904F for connecting to legacy field devices .
• CI910F – Supports CANopen and DeviceNet protocols, enhancing connectivity in industrial automation networks .
• AI810 – An analog input module for processing 4–20 mA signals from sensors, commonly used with the PM904F in process control .
• AO815 – An analog output module for controlling actuators and valves in distributed control systems .
• TD951F – An optional display unit for local monitoring of controller status and diagnostics .
• S700 I/O Modules – A range of modular I/O devices designed for direct integration with the PM904F, supporting high-density signal processing .

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