It might also be necessary to take additional timespans into account, especially if the Higher Level System Condition State is known. For details see Annex C.2 of OPC 40001-1 (v1.03 onwards)[2].

Actual Order Execution Time (AOET)

This value can be determined from the above defined KPI’s as follows:

AOET = APT + AUST + ADET + ADOT

Here, ADOT represents the sum of ATT (actual transport time) and AQT (actual queuing time), which are not defined individually in this specification.