Description

ABB PM866AK01 Processor Unit

Configured for CPU execution and control network communication in ABB AC 800M systems, the ABB PM866AK01 (PM866A Processor Unit) provides direct physical processing and data handling functions through the controller hardware platform.

Hardware Specifications

Parameter	Specification
Model	PM866AK01
Article Number	3BSE076939R1
Brand	ABB
Product Type	Processor Unit
System Platform	AC 800M Controller
Origin	Sweden
Processor Type	MPC866
Clock Frequency	133 MHz
Memory	64 MB
RAM Available for Application	51.389 MB
Flash Memory for Storage	Yes
Flash PROM for Firmware Storage	4 MB
Performance, 1000 Boolean Operations	0.09 ms
Application Capacity	32 applications per controller
Programs per Application	64
Diagrams per Application	128
Tasks per Controller	32
Number of Different Cycle Times	32
Minimum Cycle Time per Application Program	Down to 1 ms
CPU Redundancy Support	Supported
Redundancy Switch Over Time	Max 10 ms
Power Supply	24 V DC (19.2-30 V DC)
Power Consumption +24 V Typical/Maximum	210 / 360 mA
Dimensions	119 mm W x 186 mm H x 135 mm D
Weight	1200 g including base

Industrial Control Network and Firmware Interface

The PM866AK01 CPU board integrates the MPC866 processor, RAM memory, real-time clock, LED status indicators, INIT push button, and CompactFlash interface. The controller base plate provides two RJ45 Ethernet ports, identified as CN1 and CN2, for Control Network communication.

In addition, the module includes two RJ45 serial interfaces. COM3 operates as an RS-232C port with modem control signals, while COM4 provides an isolated serial connection for configuration tools.

The PM866AK01 supports CPU redundancy configurations including processor redundancy, CEX-Bus redundancy, communication interface redundancy, and S800 I/O redundancy. Therefore, the controller can maintain operation continuity through coordinated redundancy management functions.

Backplane Bus Communication and Firmware Flash Compatibility

The PM866AK01 operates within the ABB AC 800M controller architecture and exchanges data through the controller backplane and CEX-Bus interfaces. The 133 MHz processor executes application programs with cycle times down to 1 ms, while the flash memory interface stores firmware data and controller configuration information.

Furthermore, the module supports deterministic communication behavior through ABB control network interfaces. The CPU hardware manages I/O communication timing, application execution scheduling, and system diagnostics within the AC 800M platform.

Frequently Asked Questions

Q: Does the PM866AK01 support CPU redundancy configuration?
A: Yes. The PM866AK01 supports CPU redundancy together with CEX-Bus, communication interface, and S800 I/O redundancy functions. The maximum redundancy switch over time is specified as 10 ms.

Q: What communication interfaces are available on the PM866AK01 base plate?
A: The base plate contains two RJ45 Ethernet ports for Control Network connection and two RJ45 serial ports. COM3 provides RS-232C communication with modem control signals, while COM4 is isolated for configuration tools.

Q: What firmware storage method is used by the PM866AK01?
A: The controller provides 4 MB Flash PROM for firmware storage and includes a CompactFlash interface for storage functions.

Field Installation Guidelines

Install the PM866AK01 on the designated ABB AC 800M controller base plate and verify mechanical locking before applying power.

Connect the 24 V DC supply using appropriate industrial wiring practices. Maintain correct polarity and separate power wiring from high-voltage switching circuits.

For Ethernet connections, use shielded industrial communication cables and route them separately from motor power or high-current conductors to reduce electromagnetic interference.

For serial communication wiring, verify the interface type before connection. COM3 and COM4 have different electrical characteristics and must be connected according to the configured communication function.

Ensure the CompactFlash interface and LED indicators remain accessible during commissioning and maintenance activities.

Specifications

• Brand: ABB

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems