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• OPC-40501-1 – OPC UA for Machine Tools - Part 1: Machine Monitoring and Job Management
  C.2.4 Calculation of the OEE
  Availability, Effectiveness and Quality Rate. These measures are calculated as follows: Availability = APT / PBT Effectiveness = PRI x PQ / APT Quality rate = GQ / PQ In addition to the indicators ... previously defined, the planned variables PBT (Planned busy time) and PRI (Planned run time per item) are required. This information usually comes from an MES or ERP and not from