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Diagnostics Glossary Index
EZMotion User/Programming Guide 99
Revision A8 www.controltechniques.com
Figure 99: Queues View
A detailed explanation of each of the queue components is as follows:
Queue Data
The queue data is loaded into the queue by statements in the user program. Two types of data are most often used with the
queue: Position Feedback, and Master Position Feedback.
Number of Queue Units
This selects the number of Queues available. Maximum of eight.
Name
You can assign a descriptive name to each queue, making the setup easier to follow. The length of the text string is limited by
the column width with a maximum of 12 characters.
Simply double click on the Name field of any queue to assign a name to it.
Queue Size
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 source will activate.
Full Level
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.
Queue Full is only a flag and does not cause an error or a trip of any kind.
Queue Offset
The Queue Offset is the value that is added to the Queue Data and then compared to the selected source to determine when
the Queue Exit event activates. For instance, if the source in selected source 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 source will activate when the Feedback
Position is greater than or equal to 5 + 10 or 15.
Source
The Source determines which parameter the sum of the Queue Data and Queue Offset are compared to in order to activate
the Queue Exit function. If set to Position Feedback, the sum of the data and offset are compared to the Position Feedback
parameter. If set to Master Position, then the sum is compared to the Master Feedback Position parameter, and if set to
Command Position, then the sum is compared to the Motor Commanded Position.
Queue Sources and Destinations
Figure 100 shows a block diagram of the Queue object.
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