ABB · AC 800M Classic PM864AK02 Redundant Processor Unit · 96 MHz / 32 MB Redundant AC 800M processor configuration built with two PM864AK01 processor units. ABB article number 3BSE018164R1. ABB Article 3BSE018164R1 PM864A Classic · CPU redundancy · AC 800M 01 Overview PM864AK02 is a redundant processor-unit configuration for the AC 800M controller platform. The package uses two PM864AK01 processor units as the redundant CPU pair. The PM864A processor uses an MPC862 processor