Rockwell Automation FactoryTalk Metrics User Guide - Manual (Page 102)

Chapter 3 Collecting Performance Data
The historical event data contains fields to record an initial value
and an ending value for an event. The Event Value type defines
which of these fields is used as well as what is stored there.
There are the following event value types:
Event value type Description This event value type
is available for:
Plant Model Unit Part Count Sets the initial value of the event to be zero and the ending
value of the event to be the accumulated Part Count for the
duration of the event.
System-generated events
Collect Value at the Start of the Event Collects a value when the Event Trigger is activated. No
value is collected at the end of the Event Trigger and the
ending value field is ignored for this event. Use this Event
Value type when you are only interested in the data that
will be collected when the Event Trigger is activated. For
example, an event that uses the Monitored Value Event
Trigger type and is supposed to associate time-in-state
information with the additional Event Value data would
only use the initial collected value because the ending
collected value would be the same as the initial collected
value of the next historical event data record.
If you select this Event Value type, you should select a
device scheduled data point OR the same data point used to
trigger the event. If a Scheduled data point is used, there is
no guarantee that the value collected when the event is
triggered is current.
You may select a Value Lookup list to associate descriptive
string values with collected numeric codes.
• System-generated
events
• User-defined events
• Manual events
Collect Value at the End of the Event Collects a value at the termination of an event. No value is
collected when the event is activated and the initial value
field is ignored for this event. Use this Event Value type
when you are only interested in the data that will be
collected at the termination of the Event Trigger. For
example, if an event is triggered by a machine breakdown
and the operator enters a reason code for the breakdown
and resets the trigger bit, the Event Value is only available
to be collected when the event terminates.
You may select a Value Lookup list to associate descriptive
string values with collected numeric codes.
• System-generated
events
• User-defined events
• Manual events
102 Rockwell Automation Publication PLTMT-UM001M-EN-P-June 2014