120 EZMotion User/Programming Guide
www.controltechniques.com Revision: A8
Figure 130: Selector Block Diagram
The Selector is configured by using a series of Sources and Destinations on the Assignments view. The inputs to the selector are
Selector.Select# and Selector.SelectorInitiate. These inputs to the Selector can be found under the Selector group of
Destinations on the Assignments view. The outputs from the selector are called Selector.Selection#, and can be found under the
Selector group of Sources on the Assignments view.
In most cases, hardware inputs are assigned to the Selector.Select functions.
Based on the status of the binary select lines, a selector.selection source will be active when the Selector.SelectorInitiate destination
is activated.
At the top of the Selector view (see Figure 129), the Selector Input Destinations field defines how many Select lines will be used. The
number of Selector.Selection outputs is a direct result of the number of Select lines. The formula is as follows:
# of Selection outputs = 2
n
(where n is the number of Select inputs)
The maximum number of Select lines is eight.
Once you have determined how many select lines you want, the assignments to these Selector.Select lines is then made in the
Assignments view.
Example:
If the user enters 2 for the number of Selector Input Destinations, we would have 4 Selection lines (Selector.Selection0 through
Selector.Selection3). The Selector.Selection number that activates is determined by the status of the Selector.Select lines when the
Selector.SelectorInitiate bit is activated. Each select line has a specific binary value.
The binary value is determined as follows:
Sn x 2
n
where Sn = Status of Selector.Select line n
Sn = 0 if Selector.Select line n is inactive, and
Sn = 1 if Selector.Select line n is active
The sum of all the binary values determines which Selector.Selection line will be active.
The following examples demonstrate how to determine which Selector.Selection will activate based on the Selector.Select lines.
Example:
If Selector.Select2 is active, Selector.Select1 is inactive, and Selector.Select0 is active, then the total binary value is as follows:
S2 = 1, S1 = 0, and S0 = 1. Therefore,
Total Binary Value = (1 x 2
2
) + (0 x 2
1
) + (1 x 2
0
)
Total Binary Value = 4 + 0 + 1
Total Binary Value = 5
Therefore, when Selector.SelectorInitiate activates, Selector.Selection5 will activate.
Example:
If Selector.Select2 is inactive, Selector.Select1 is active, and Selector.Select0 is active, then the total binary value would be as
follows:
S2 = 0, S1 = 1, and S0 = 1. Therefore,
Total Binary Value = (0 x 2
2
) + (1 x 2
1
) + (1 x 2
0
)
Total Binary Value = 0 + 2 + 1
Total Binary Value = 3
Therefore, when Selector.SelectorInitiate activates, Selector.Selection3 will activate.
The Selector.Select lines can change without any action until the Selector.SelectorInitiate destination is activated.
Selector.Selection sources can be tied to any destination in the Assignments view. Figure 131 shows the four Selection lines being
assigned to Index 0 through Index 3 Initiates, and the two Select lines being assigned to digital inputs. By doing this, we could initiate
up to four indexes with only two Select lines and a Selector Initiate. This helps to minimize the number of inputs required to initiate a
large number of indexes or programs.
Selector.Select0
Selector.Select1
Selector.Select2
Selector.Select3
Selector.Selection0
Selector.Selection1
Selector.Selection2
Selector.Selection3
Selector.Selection4
Selector.Selection5
Selector.Selection6
Selector.Selection7
Selector.Selection8
Selector.Selection9
Selector.Selection10
Selector.Selection11
Selector.Selection12
Selector.Selection13
Selector.Selection14
Selector.Selection15
Selector.SelectorInitiate
Selector Object
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