ABB PM861AK01 Processor Unit

The ABB PM861AK01, also cataloged as the PM861A Processor Unit, operates as a dedicated hardware component for central processing and control execution within ABB 800xA / AC 800M controller platforms. This central unit kit coordinates the execution of application logic, data logging, and field network cyclic data exchanges. 

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks and I/O Density Scaling

The PM861AK01 implements deterministic high-speed data structures to manage communication interfaces across dedicated CEX-bus, ModuleBus, and RCU-Link topologies. It interfaces with external Profinet or EtherNet/IP deterministic networks via plug-in communication interfaces, keeping network latency minimal during massive I/O density scaling routines. Localized backplane bus communication velocity is maintained by native hardware bus terminators (TB850, TB807, and TB852), while the processor platform enforces full firmware flash compatibility to synchronize process logic execution across redundant controller pairs without loop timing degradation.

Frequently Asked Questions

Q: What is the specific operational function of the individual terminators included in the PM861AK01 kit?

A: The TB850, TB807, and TB852 modules serve as physical electrical impedance terminators for the CEX-bus, ModuleBus, and RCU-Link ports respectively. They stabilize the communication velocity lines by eliminating electrical signal reflections across the backplane extension layers.

Q: How does the processor unit handle runtime program retention in the event of a total 24 VDC input power failure?

A: The kit contains a 9-gram lithium portable battery that provides auxiliary electrical power to the onboard volatile RAM sectors during blackouts. This backup preserves the active database, runtime application states, and event logs until primary power returns.