C.1 Overview

To calculate KPIs such as the availability or efficiency of a machine or plant, the respective times must be used. These can be derived from the MachineryItemState and the MachineryOperationMode. This annex does not define any KPI values. The assumption is, that the KPIs will be calculated application specific, but can be based on those two states. Potentially, more information is needed for calculating specific KPIs.

To calculate KPI often information about the planning of production is required. This information usually comes from a higher level system such as MES or ERP and not from the machine, so it has not been included in this specification.

The following table in C.2 is used to explain how the required KPI time elements can be derived conform to ISO 22400-2 using the combination of MachineryItemState, MachineryOperationMode and HLS-ConditionState of the higher level system such as MES or ERP on level 3 (see IEC 62264-1). The KPI element definitions used are taken from the ISO 22400-2:2022 called Automation systems and integration - Key performance indicators (KPIs) for manufacturing operations management for KPI calculation.

The following section C.3 provides an example interpretation, of how the MachineryOperationMode and MachineryItemState can be used to determine SEMI E10 [5] times. Typically, MachineryItems are scheduled by higher level systems and are not aware how they are scheduled. So, interpretations of SEMI E10 times are typically “Operations time”.