Control Techniques Epsilon EP-P, Справочное руководство

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178
Epsilon EP-P Drive Reference Manual
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www.controltechniques.com Revision: A4
Data In
Queue.#.DataIn
Data is loaded into the queue using the Queue.#.DataIn instruction in a program. When Data In is set equal to a value, that value is entered
into the queue and the queue offset is added to it. If Queue Overflow is active, then no more data can be put into the Queue.
Full Level
Queue.#.FullLevel
The amount of data in the queue is constantly monitored and the Queue Full source will activate when the number of pieces of data in the
queue exceeds the Full Level parameter. This is only a flag and does not indicate a fault of any kind.
Queue Clear
Queue.#.QueueClear
This destination automatically clears all of the data out of the queue. The cleared data is not saved and there is no way to recover the cleared
data. This is typically activated on power-up of the system to make sure no old data remains in the queue.
Queue Compare Enable
Queue.#.QueueCompareEnable
The Compare Enable is what causes the comparator internal to the queue to function. If the Compare Enable is inactive, then the Queue Exit
source will never activate. If activated, then the Queue Exit source will activate when the Queue Data plus the Queue Offset is equal to the
Comparator Select parameter.
Queue Empty
Queue.#.QueueEmpty
This source is active if no data is stored in the queue. It will become inactive when the first piece of data is loaded into the queue and remain
inactive until all data has been removed from the queue.
Queue Exit
Queue.#.QueueExit
This source activates when the Comparator Select parameter is equal to the sum of the data entered into the queue, plus the queue offset.
Queue Exit deactivates when the Queue Remove instruction is processed.
Queue Full
Queue.#.QueueFull
The Queue Full source will activate if the number of pieces of data in the queue equals or exceeds the Full Level parameter. The source will
deactivate when the number of pieces of data in the queue is less than the Full Level.
Offset
Queue.#.QueueOffset
The Queue Offset is the value that is added to the Queue Data and then compared to the Comparator to determine when the Queue Exit event
activates. For instance, if Comparator Select is set to Feedback Position, and the Queue Offset is set to 10, and the user puts the value 5 into
the queue, the queue exit function will activate when the Feedback Position is equal to 5 + 10 or 15.
Queue Overflow
Queue.#.QueueOverflow
This source activates when there is no more room in the queue to store data. The maximum number of pieces of data is determined by the
Queue Size parameter.
Size
Queue.#.QueueSize
This is the maximum number of elements that can be stored in the queue. If more than this number of pieces of data is in the queue at a time,
then a Queue Overflow event will activate.
Queue Remove
Queue.#.Remove
The Queue Remove instruction is used in the program to remove data from the queue. When processed, the oldest piece of data will be
deleted out of the queue. The Queue Remove instruction also deactivates the Queue Exit function.