Change Notifier v2.0

The Change Notifier block sends out a notification when its input data stream changes by a given amount over a configurable, moving time window. When a sufficiently large positive or negative change has occurred, the output feed will indicate this by setting the changed field to true. The output feed can be configured to automatically reset to its unchanged state a certain time after triggering by setting the reset period parameter.

Parameter	Description
period	The maximum age of any sample that is used in the calculations, in seconds. Any samples older than this will be discarded before performing the calculation. Must be greater than zero.
amount	The change amount value, zero to ignore. A notification will be sent if the difference between the oldest value inside the time window and the most recent sample is greater than this amount. Absolute values are used in the calculations.
percentage	The change percentage value, zero to ignore. Absolute values are used as for the amount parameter. 100.0 means to look for a doubling of the input values.
reset period	Following the detection of a big enough change, the output feed will be reset to its un-triggered state after this interval. It is specified in seconds, and is ignored if less than or equal to zero.

Operation	Description
start	Starts checking for changes in the input data feed.
stop	Stops checking for changes.
clear	Discards all stored values.
reset	Resets the changed notification flag.

Feed	Field	Description
data	value	Feed of input values

Feed	Fields	Description
notify	percentage change	The amount of change measured as a percentage.
	amount change	The amount of change.
	changed	Set true to indicate a sufficiently large change has occurred. Is reset to false by calling operation reset, or after the specified reset period.