ABB PM858AK02 AC 800M CPU Processor Module Technical Datasheet

ABB PM858AK02 CPU Processor Module

The ABB PM858AK02, also cataloged as the PM858AK02 CPU Module, operates as a dedicated hardware component for executing control logic and process automation tasks within System 800xA network platforms.

Hardware Specifications

Deterministic Industrial Control and Firmware Compatibility

The PM858AK02 module maintains deterministic operation by executing cycle-based control tasks via the AC 800M backplane bus. The module utilizes high-speed RISC architecture to process complex control loops. Firmware flash compatibility is managed through the System 800xA engineering environment. To ensure system stability, verify that the module firmware version matches the existing controller cabinet configuration before performing any site-wide updates. Profinet and EtherNet/IP communication stacks are handled via the onboard Ethernet ports, ensuring synchronization with distributed I/O subsystems.

Frequently Asked Questions

Q: Does the PM858AK02 support hot-swapping in a redundant configuration?

A: Yes, provided the redundant pair is configured correctly in the controller software, the module supports hot-swapping. Ensure the primary CPU is in an active state and the standby CPU is synchronized before removal.

Q: How is the redundant switchover time managed?

A: The switchover is handled automatically by the AC 800M redundancy protocol. The timing depends on the cycle time of the controller application; typically, the standby unit tracks the state of the primary to ensure seamless failover.

Field Installation Guidelines

1. Mounting: Ensure the module is seated firmly in the dedicated AC 800M controller rack. Verify that the CEX bus connector is fully engaged and aligned to prevent backplane pin damage.
2. Grounding: Secure the module chassis to the cabinet earth bus to minimize electromagnetic interference. Ensure the DIN-rail or rack mounting provides a low-impedance path to ground.
3. Wiring: Use shielded twisted-pair cabling for Ethernet communication to comply with industrial noise immunity standards. Maintain physical separation between power supply lines (24 V DC) and communication signals to mitigate crosstalk.
4. Environment: Verify the cabinet ambient temperature remains within the specified -20 deg C to +60 deg C range. Avoid installation in areas with high vibration or excessive particulate matter unless the cabinet is rated for such environments.