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Diagnostics Glossary Index
EZMotion User/Programming Guide 123
Revision A8 www.controltechniques.com
Enable Channel Check Box
By default, the analog input channel is not enabled meaning that EZMotion is not reading the A/D value read by the analog
circuit. If the channel is not selected (disabled) the configuration parameters for the analog input are dim and unavailable. To
enable the input, simply select the Enable Channel check box, and the configuration parameters will become available to edit.
If the user wishes to control the Analog Input through other means within the Unidrive SP/Digitax ST, it is necessary to clear
the Enable Channel check box.
Module Variable
The Module Variable parameter defines what EZMotion parameter will be controlled by Analog Input Channel 1. This means
that the selected module parameter will automatically be populated with a value based on the Max and Min scaling values
entered on this view.
NOTE
If assigning the Analog Input to the Jog.#.Vel parameter, it is recommended to change the global ramp type to "Linear". If the
ramps are not set to linear, then the accel decel profiles can be infinite in length regardless of the value they are set to on
the Jog view. The ramp type (or AccelType) can be found on the Ramps view.
Maximum Value
In order to scale the raw analog input value into the proper scale and units for the selected Module Variable, the user must
define the maximum scale value and the minimum scale value. EZMotion then uses linear interpolation to scale the analog
input and populate the specified Module Variable.
The Maximum Value is the value that the Module Variable will be set to when the Analog Input reaches the specified Maximum
Input value.
Maximum Input
This defines the Maximum Input value in % that will yield the corresponding Maximum Value for the selected Module Variable.
The Analog Input is not limited to this value, but this is used as a point on the “curve” for the linear interpolation equation.
Example:
If the Maximum Value is set to 5000, and the Maximum Input is set to 100%, this means that when the Analog Input reaches
100% of scale, the value of the selected Module Variable will be set to 5000.
Set Maximum Input Button
By pressing this button, the current value of the analog input will be read and stored in the Maximum Input text box. This is a
simple tool that allows the user to set the analog input to full scale, and then easily read the value without requiring additional
calibration. The button appears dim except when online with EZMotion.
Minimum Value
In order to scale the raw analog input value into the proper scale and units for the selected Module Variable, the user must
define the maximum scale value and the minimum scale value. EZMotion then uses linear interpolation to scale the analog
input and populate the specified Module Variable.
The Minimum Value is the value that the Module Variable will be set to when the Analog Input reaches the specified Minimum
Input value.
Minimum Input
This defines the Minimum Input value in % that will yield the corresponding Minimum Value for the selected Module Variable.
The Analog Input is not limited to this value, but this is used as a point on the “curve” for the linear interpolation equation.
Set Minimum Input Button
The Set button when pressed, reads the current value of the analog input and stores that value in the Minimum Input text box.
This is a simple tool that allows the user to set the analog input to minimum scale, and then easily read the value without
requiring additional calibration. The button appears dim except when online with EZMotion.
Example:
If the Minimum Value is set to -5000, and the Minimum Input is set to 0%. This means that when the Analog Input reaches 0%
of scale, the value of the selected Module Variable will be equal to -5000.
A/D Output (Raw Value)
The Raw Value is a read-only parameter that while online with EZMotion will show the user the current value of the analog
input in units of % of maximum scale. The range of this parameter is always 0 to 100% regardless of the Maximum Input and
Minimum Input values previously configured.
8.6.6 Analog Input - Channel 2
The second analog input on the Unidrive SP/Digitax ST is a lower resolution (10-bit) input. All setup parameters for Analog
Input 2 are the same as Analog Input 1 other than the Input Mode parameter.
Following is a description of the Input Mode parameter. For information on other parameters, please see Analog Input –
Channel 1 above.
Input Mode
Analog Input 2 on the Unidrive SP/Digitax ST is capable of operating in multiple different modes so that it can work with
different Analog circuits. The three different types of analog circuits supported are as follows:
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