3BSE066490R1 PM856AK01: PM856AK01 controller: CPU resources, baseplate and revision planning
The ABB PM856AK01 is an AC 800M controller CPU with article number 3BSE066490R1. ABB’s hardware selector lists a 24 MHz clock, 16 MB memory and an execution reference of 0.46 ms for 1,000 Boolean operations. The PM856AK01 is identified as non-redundant; do not infer redundancy from the broader controller family.
Key technical data
| Technical item | Verified value / selection note |
|---|---|
| Type | PM856AK01 |
| Article number | 3BSE066490R1 |
| Clock frequency | 24 MHz |
| Memory | 16 MB family data; application RAM about 10.337 MB per ABB selector |
| Performance reference | 1,000 Boolean operations in 0.46 ms |
| Redundancy | Non-redundant PM856AK01 |
| Platform | AC 800M / System 800xA |
The table summarizes family or catalog values for identification and initial selection. Confirm the nameplate, environmental limits, standards, revision and options for the exact device before procurement or engineering approval.
Application and system selection
Evaluate controller capacity using the project’s actual application, communication load, task cycles, memory use and redundancy strategy. Check the Control Builder and 800xA versions, installed libraries, communications interfaces and baseplate. A CPU replacement can affect application compatibility, so compare backups and revision notes before scheduling a change.
Configuration and compatibility
Confirm the exact PM856AK01 order number, CPU revision, baseplate type and Ethernet/serial connections. Review the controller’s supported software baseline and the required communication modules. Related PM85x controllers are not automatically drop-in replacements because performance, redundancy, firmware and I/O support can differ.
Related models and order-code references
The following designations are related catalog references, not automatic substitutes. Check each complete code, rating, connection, revision and application requirement before selecting a variant.
- PM856A
- PM856AK01 3BSE066490R1
Installation and commissioning
Back up the project and controller data before service. Follow the approved shutdown and ESD process, verify baseplate and module seating, and check Ethernet identity and serial connections. After commissioning, validate controller mode, application load, task timing, I/O quality and alarm status, then archive the final hardware and firmware inventory.
Replacement and procurement information
For a quotation or replacement review, provide the complete designation 3BSE066490R1 PM856AK01, the order code where applicable, serial or hardware revision, quantity, operating environment, connected equipment and required delivery date. Include a legible nameplate image and relevant wiring, loop or switchgear drawing so the exact interface and configuration can be checked.
Ask the supplier to confirm accessories, revision compatibility and any approved successor in writing. Do not select solely from a family name or product photograph. Follow the current ABB installation and safety instructions for the exact unit.
