The ABB PM861 (3BSE018129R1) is a high-performance processor unit for the AC 800M controller family, part of ABB’s 800xA system architecture. Engineered for demanding process control environments, it features redundancy support, advanced communication capabilities, and a modular structure ideal for scalable industrial automation. This processor integrates seamlessly with the CEX-Bus and optical ModuleBus, supporting a wide variety of field communication interfaces.

Technical Specifications

Applications

• Distributed Control Systems (DCS)

• Chemical and Petrochemical Plants

• Power Generation and Distribution

• Water and Wastewater Treatment

• Food and Beverage Industry

• Pulp and Paper Automation

• Metal and Mining Control Systems

Product Advantages

• Modular and scalable for system expansion

• Redundant architecture for high system availability

• Built-in Ethernet and serial communication ports

• Compact DIN-rail mounting with IP20 protection

• Seamless integration with ABB S800 I/O and CEX modules

• Supports wide fieldbus protocols (PROFIBUS, Modbus TCP, etc.)

• Quick maintenance with hot-swappable units

Frequently Asked Questions (FAQ)

Q1: What type of CPU is used in PM861?

A1: The PM861 uses an MPC86x microprocessor running at 133 MHz.

Q2: Does PM861 support redundancy?

A2: Yes, PM861 supports CPU redundancy and CEX-Bus redundancy.

Q3: What kind of I/O connectivity does it support?

A3: It supports both electrical and optical ModuleBus connections.

Q4: Can I connect external batteries for backup?

A4: Yes, PM861 supports both internal and external battery options.

Q5: What fieldbus communication protocols are supported?

A5: It supports protocols such as PROFIBUS DP, Modbus TCP, FOUNDATION Fieldbus, PROFINET IO, and more via CEX modules.

Q6: What is the typical installation method?

A6: It is designed for DIN rail mounting.

Q7: Is it compatible with AC 800M High Integrity applications?

A7: Yes, when used with appropriate safety modules like SM810/SM811.

Q8: Does the unit include onboard memory backup?

A8: Yes, it includes battery-backed RAM for application retention.

Q9: Can the unit be hot-swapped?

A9: Yes, in redundant configurations, the faulty CPU can be replaced without system shutdown.

Q10: What is the physical size of the PM861?

A10: The dimensions are 119 x 186 x 135 mm, and it weighs 1.1 kg.