Delta AX-3 Series, Руководство по эксплуатации, Страница: 206 / 370

A X - 3 S e r i e s O p e r a t i o n M a n u a l
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7.7.5 Common Functions for Single-axis Control
The common functions for single-axis control are described in the following section.
7.7.5.1 Command Position

Types of positions
The axis motion function modules adopt the following two types of positions.
Type of position
Meaning
Command position
The position that MC function modules outputs to control an
axis.
Actual position The position as feedback from the servo drive*
*Note: For virtual axis, there is no position feedback from the servo drive, so the command
position will replaces the actual position.
The following figure shows the relationship between the command position and actual position:
A comparison between the command position and actual position:
Item Command position Actual position
Count mode Linear axis / rotary axis
The same count mode setting as in command
position
Command unit
Length unit (m, mm,
inch
…) / angle
unit (degree) / …
The same unit setting as in command position
Software limits
Set the range limit for MC function
modules
The same range limit setting as in command
positoin
Positioning
Change to any desire position within
the range limit
The same position setting as in command
position, but position lag may appear*
*Note: Due to the settings of servomechanism, the so-called position lag may be generated between command
and actual positions. As motion velocity increases, position lag also increases slightly. When limiting the lag, you
can adjust axis setting to monitor the position lag and set operation for position lag being too large. For virtual axis,
actual position equals to command position and position lag does not exist.