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Y vs. Time Templates
Y vs. Time Templates contain a set of measurement limits at "time
into event"; the measurement value should
be within a known upper and lower limit at time X into the event. The
template limit profile is the same for each occurrence of the event.
Example:
The template below contains a set of
limits for a level measurement during the event. The 3 traces are:
Red: Upper limit
Green: Center line
Blue: Lower limit
Template
limits (Y vs. Time)
When an event is active, the level measurement value will be compared to the template limits in
real-time, storing the current alarm state (high limit violation,
compliant, low limit violation) in an alarm point on the PI Server
(digital tag). The user can also perform analysis of historical
measurement values (during completed events) versus the template
limits.
The trend below shows the level (black
trace) versus the template limits during an event. For this event,
the level value was close to, or above, the upper limit during the
entire event. The current alarm state is stored in a digital alarm
tag on the PI Server.
Template
limits and measurement value during an event
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