Rockwell Automation FactoryTalk Metrics User Guide - Manual (Page 118)

Chapter 3 Collecting Performance Data
When you select this option, the Metrics Server Manager
calculates availability in the least restrictive way. It means that
either the Scheduled Availability or the Monitored
Availability must evaluate to available for the activity area to
be considered overall available.
The following table lists the results of the Boolean AND and OR
operations:
Scheduled
Availability
Monitored
Availability
AND Result OR Result
Available Available Available Available
Available Not Available Not Available Available
Not Available Available Not Available Available
Not Available Not Available Not Available Not Available
Under Performance Data Trending Rate, specify the interval at
which workcell history records will be written to the database.
By default the rate is 10 minutes, so there will be one new record
inserted in the workcell history table for each active activity area
every 10 minutes (unless some other summarization events have
occurred that would create additional records). Setting the interval
to a higher number will result in fewer records in the database, each
of them spanning a longer time.
Machine states are special attributes of user-defined events. While
user-defined events are independent of each other (i.e., at any time
there may be no or many user-defined events active at a particular
activity area), machine states are mutually exclusive. This means that
Performance Data Trending
Rate
Machine States
118 Rockwell Automation Publication PLTMT-UM001M-EN-P-June 2014