PM 902F 3BDH001000R0001 is the standard CPU module for the AC 900F controller in the ABB Freelance DCS system, positioned for mid-to-high performance process control.It is equipped with an 800 MHz processor, featuring 4 Ethernet ports, 2 serial interfaces and 2 communication expansion slots as standard. It natively supports redundancy, SD card backup and G3 corrosion protection class, and can handle up to approximately 1500 I/O points.Suitable for continuous process industries such as chemical, power, metallurgy and water treatment, it balances ease of use, scalability and high availability, making it the mainstream control unit for Freelance 2019 and later versions.
Positioning and Family Relationship
- System: ABB Freelance 2019 DCS
- Controller Platform: AC 900F
- Product Level: AC 900F Standard
- Comparison within the same series: PM 901F (Lite), PM 904F (Plus)
- Order Number: 3BDH001000R0001
Software Requirement: Freelance 2013 or later
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Functions & Features
High-Performance Real-Time Control
- Based on a real-time multitasking operating system, it supports 8 cyclic tasks (adjustable from 5 ms to 24 hours) and PLC full-speed mode, satisfying fast closed-loop and sequential control.The processing time for 1000 instructions reaches the millisecond level.
Rich Communication Capabilities
- 4 Ethernet ports: Flexible allocation for control network, redundant links, Modbus TCP, and telecontrol protocols
- 2 serial ports: Modbus RTU/ASCII, IEC 101
- Expansion slots: Support CI 930F (PROFIBUS DP V0/V1 with line redundancy) and CI 910F (CAN)Compatible with remote I/O (S700/S800/S900), third-party devices, and OPC access.
High-Availability Redundancy Design
- Supports controller redundancy with real-time synchronization between two units via a dedicated Ethernet link.Combined with CI 930F, it enables PROFIBUS line redundancy to eliminate single points of failure.
Industrial-Grade Reliability
- Standard G3 anti-corrosion coating, wide temperature range, and resistance to vibration / shock for harsh working conditions.Battery backup ensures no loss of programs and real-time data during power failure.
Easy Engineering & Maintenance
- Unified configuration, commissioning, and diagnostics via a single engineering tool.Supports local display panel operation, offline SD card updates, and controller download locking, improving O&M security and efficiency.
Application Scenarios
- Process Industry: Chemical, petrochemical, pharmaceutical, metallurgy, water treatment
- Energy Sector: Small power stations, waste heat recovery, pump station control
- Equipment Integration: Skid-mounted equipment, packaging units, packaged plant automation
- Retrofit & Upgrade: Legacy system replacement, hybrid DCS/PLC networking
Frequently Asked Questions (FAQ)
- What are the core differences between PM 902F, PM 904F and PM 901F?
- PM 902F: Standard version, 4 Ethernet ports, 2 expansion slots, 24 MB memory, approx. 1500 I/O points
- PM 904F: Enhanced version, 4 Ethernet ports, 4 expansion slots, 48 MB memory, higher performance and scalability
- PM 901F: Lite version, 3 Ethernet ports, 2 expansion slots, 11 MB memory, max. approx. 400 I/O points
- Is Freelance 2019 required?Minimum requirement is Freelance 2013. Freelance 2019 is recommended for full features including multiple monitors, enhanced user management and protocol optimization.
- How many S700 I/O modules can be directly connected?Up to 10 S700 direct I/O modules on one side, supporting mixed high-density analog/digital modules to save cabinet space.
- How to configure redundancy?Dual PM 902F units use the 2nd Ethernet port for redundant synchronization link with identical I/O and communication modules, enabling millisecond-level bumpless switchover. PROFIBUS line redundancy can be achieved with CI 930F.
- What happens if the battery runs out?Low battery warning is issued approx. 14 days in advance. Battery buffers data for more than 2 years during power failure and can sustain operation for about 14 days after warning.Replacement with TA 951F lithium battery is recommended and can be done without interrupting operation.
- Is third-party I/O and PLC supported?Yes, third-party devices can be connected via PROFIBUS, Modbus RTU/TCP, IEC 60870-5-101/104.OPC and DMS-API interfaces are provided for integration with third-party PLCs and SCADA systems.
- What are the operating temperature and installation requirements?New hardware operating temperature: -20 ~ +70 °C, no forced cooling required.Supports 35 mm DIN rail or wall mounting; horizontal installation is recommended for optimal heat dissipation.Is the operating system pre-installed?No operating system included; it must be downloaded to the CPU during engineering software installation.Batch firmware and application updates via SD card or engineering station are supported.
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