ASDA Series Application Note Application Examples
March, 2015 3-95
3.7 Application of Precision Positioning via Mark Reading
3.7.1 Description
ASDA-A2 has built-in motion control function. It can quickly complete motion control command
and be applied to the application that requires quick response and precise positioning. The
general controller cannot satisfy the demand of some applications, which might needs different
speed control, but ASDA-A2 could show its excellent performance in this area. The example
elaborated in this chapter aims at positioning control. In a length of moving distance, the system
has to complete precision positioning via mark reading.
This example uses PR control, COMPARE/CAPTURE function of ASDA-A2 to complete
positioning application. Unlike the traditional motion control method, ASDA-A2 provides a more
flexible, better function and more instant setting. A higher cost is needed when applying to the
controller, since a high-level of controller to ensure the timely communication is a must.
ASDA-A2 servo system offers a smoothing motion and simple setting, which dramatically
enhance the system performance and reduce the cost of design and development.
3.7.2 System theorem and setting
During operation, mark reading function has to be enabled in a section. Outside the section, the
function has to be disabled for reducing the interference. If the sensor detects the mark within the
mark reading section, the current command will be replaced by another one. Then, move a
length of distance starting from the mark. That is the so-called positioning function. Although it is
a continuous cycle, it will not produce accumulative error (because every cycle is a refresh start).
If the sensor does not detect the mark result from poor printing, the system will move the default
length automatically. So that it could prevent the problem of mark losing or mark undetectable
and cause incorrect positioning. No matter the mark is able or unable to be read, CAPTURE and
COMPARE function of ASDA-A2 can ensure the smoothing moving speed and accurate position.
3.7.3 Setting of servo system
3.7.3.1 DI setting
Users need to connect the photoelectric switch to DI7 of ASDA-A2 and setup a DI that is enabled
every cycle. This DI function can be triggered by SHOM or EV or it can be replaced by parameter
P5-07.
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