ABB 3BSE076940R1 PM862K01 | Processor Unit | AC 800M CPU Fault

Description

ABB 3BSE076940R1 PM862K01 AC 800M | Processor Unit | 800xA Controller

Key Technical Specifications

ABB specifies PM862K01 at 67 MHz with 32 MB memory, with 23.521 MB available for applications. The CPU supports application cycle times down to 1 ms, up to 32 applications/tasks, and up to 12 communication modules on the CEX-Bus.

The package is supplied as a processor unit rather than simply a bare CPU board. ABB’s hardware documentation lists the PM862 CPU, TP830 baseplate, TB850 CEX-Bus terminator, TB807 ModuleBus terminator, TB852 RCU-Link terminator, and 3.6 V memory-backup battery in the PM862K01 package.

Product Introduction

The ABB 3BSE076940R1 PM862K01 is an AC 800M processor unit designed for control applications within ABB System 800xA. The PM862 executes the configured control applications and provides the controller platform for communication interfaces and S800 I/O through the AC 800M architecture. ABB identifies the unit as a 67 MHz MPC866 processor with 32 MB memory.

A useful procurement distinction is that PM862K01 is a single, non-redundant processor package. ABB separately identifies PM862K02 as the redundant package containing two PM862 processor units. Therefore, a should not be described as a redundant CPU merely because the broader PM862 family can be configured redundantly.

3BSE076940R1 PM862K01

Application Scenarios & Field Pitfalls — Engineer’s Perspective

Engineering Pain Point

When a PM862 fails, the physical CPU is only one part of the replacement decision. The controller’s application software, Control Builder version, firmware, memory contents, CEX-Bus configuration, ModuleBus arrangement, communication interfaces, and backup strategy all affect whether a replacement can be returned to service without extended commissioning.

Typical Applications

• ABB System 800xA DCS controller systems
• AC 800M process-control applications
• S800 I/O control architectures
• Plant PLC/DCS control cabinets using CEX-Bus communication
• Legacy PM861A/PM864A replacement projects where ABB-approved migration applies

Technical Pitfalls to Avoid

1. Do not confuse with PM862K02.
   is the single processor package. PM862K02 contains two units for redundancy and includes the additional redundancy-related cable/accessories. The two ordering packages are not equivalent.
2. Check the engineering software version before replacement.
   ABB states that is compatible with System 800xA 6.0.2 and Compact Control Builder 6.0.0-1 and later. A physically compatible CPU does not automatically make an older engineering environment suitable for the replacement.
3. Do not substitute a PM864A purely on memory or processor similarity.
   ABB identifies as the replacement type for PM864AK01 in its control-system documentation, but the migration still requires checking the installed 800xA version and controller configuration. ABB’s documentation shows PM864AK01 as a Classic lifecycle device and as the Active replacement type.
4. Preserve the controller configuration and backup strategy.
   The includes a 3.6 V lithium battery for memory backup. Before removing a running CPU, verify the application backup, controller configuration, memory contents, and battery condition rather than treating the job as a simple hardware swap.

Related Products

• ABB PM862K02 / 3BSE081636R1 — Redundant processor package containing two CPUs.
• ABB PM858K01 / 3BSE082895R1 — AC 800M processor unit with lower processing performance and memory capacity.
• ABB PM866AK01 / 3BSE076939R1 — Higher-performance AC 800M processor in the same newer controller family.
• ABB PM864AK01 / 3BSE018161R1 — Classic AC 800M processor for which is identified by ABB as a replacement type.
• ABB PM861A — Earlier AC 800M processor family associated with the migration path toward PM858//PM866A.
• ABB TP830 — Baseplate supplied with the processor package.
• ABB TB850 — CEX-Bus terminator included with .
• ABB TB807 — ModuleBus terminator included with the package.
• ABB TB852 — RCU-Link terminator included with the package.
• ABB BC810 / BC820 — CEX-Bus interconnection hardware used with AC 800M communication and redundancy arrangements.

Procurement Check

Before approving an ABB 3BSE076940R1 replacement, verify:

• Exact product ID: 3BSE076940R1
• Exact designation:
• Single CPU versus redundant architecture
• Installed System 800xA version
• Compact Control Builder version
• CPU firmware revision
• Existing AC 800M application backup
• CEX-Bus communication modules
• ModuleBus configuration
• S800 I/O arrangement
• TP830 baseplate condition
• TB850, TB807, and TB852 terminators
• Memory-backup battery condition
• Controller configuration and application license requirements
• Existing PM864A/PM861A migration status, if applicable

Recommended procurement description:

ABB 3BSE076940R1 AC 800M Processor Unit, 67 MHz MPC866 CPU, 32 MB Memory, TP830 Baseplate, CEX-Bus and ModuleBus Terminators, RCU-Link Terminator, and Backup Battery Package.

The important distinction is straightforward: 3BSE076940R1 is the ABB single processor package for AC 800M, not a redundant CPU package and not an I/O module. For a field replacement, the 800xA/Control Builder version, firmware, application backup, CEX-Bus configuration, and exact K01/K02 architecture should be checked before installation.