ABB PM858 AC 800M Processor Unit

Product Description

The ABB PM858 is a processor unit for the AC 800M controller platform, designed to execute control applications and coordinate communication with connected automation devices. It uses an MPC866 processor architecture with a 33 MHz clock frequency, 16 MB of total memory, and dual Ethernet interfaces. In addition, the unit provides two serial communication ports for configuration and other serial connections.

Processor and Memory Architecture

The PM858 uses an MPC866 processor operating at 33 MHz. It delivers a Boolean processing performance of approximately 0.36 ms per 1,000 Boolean operations. This processing capability supports the execution of controller logic and associated automation tasks.

The memory architecture includes approximately 7.15 MB of application RAM and 4 MB of Flash PROM storage within the stated 16 MB total memory configuration. Application RAM supports runtime program execution, while Flash PROM provides non-volatile storage for controller software and application data.

Communication Interfaces

The controller provides two RJ45 Ethernet ports, CN1 and CN2, for communication with the control network and other connected system components. These interfaces support data exchange between the controller and the automation system.

Furthermore, two serial interfaces provide additional communication options:

• COM3: RS-232C interface with modem control signals.
• COM4: Isolated serial interface intended for configuration tools.

These interfaces allow the controller to support both Ethernet-based communication and serial configuration connections.

Redundancy and System Configuration

The PM858 belongs to the ABB AC 800M controller family. Its available hardware configurations include single-controller and redundant arrangements. The PM858K01 represents a non-redundant configuration, whereas the PM858K02 is identified as a redundant configuration.

Therefore, buyers should check the complete ordering code before selecting a replacement. The controller designation alone does not establish whether the supplied hardware includes a redundant processor arrangement.

Software and Environmental Requirements

The stated software requirements include ABB System 800xA version 6.0.2 and Compact Control Builder version 6.0.0-1 or later. Software compatibility should be checked against the installed controller environment before commissioning or replacement.

The module has an IP20 protection rating. Its enclosure classification should be considered when selecting the installation location and required cabinet protection.

Technical Specifications

Frequently Asked Questions

Q: What is the main function of the ABB PM858?

A: The PM858 executes controller applications within the ABB AC 800M platform. It processes control logic and communicates with connected automation devices through Ethernet and serial interfaces.

Q: Does the ABB PM858 support CPU redundancy?

A: Yes. Redundancy is available through designated hardware configurations. The PM858K01 is a non-redundant configuration, while the PM858K02 is a redundant configuration. Check the complete ordering code to confirm the supplied arrangement.

Q: What communication interfaces does the PM858 provide?

A: The unit provides two RJ45 Ethernet ports and two serial interfaces. COM3 supports RS-232C with modem control, while COM4 provides an isolated connection for configuration tools.

Other Attributes

• Series: Advant OCS/800xA
• Country of Origin:  Germany/Sweden/Finland
• Lead Time: In Stock, 2 Working Days

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