Yaskawa MP2000 Series: Built-in SVB or SVB-01 Motion Module - Manual (Page 350)

9.4 Absolute Position Detection for Infinite Length Axes
9.4.1 Simple Absolute Infinite Length Position Control
9-13
Absolute Position Detection
9.4 Absolute Position Detection for Infinite Length Axes
Infinite length axis positioning is a function that automatically resets the machine position, program position (absolute
values in the program coordinate system), and current position at regular intervals according to the Infinite Length Axis
Reset Position (POSMAX) (fixed parameter 10). This function can be used for repeated positioning in one direction.
9.4.1 Simple Absolute Infinite Length Position Control
( 1 ) Overview
The Simple Absolute Infinite Length Position Control is a position control method that can be used for infinite length
axes and has the following features.
• The coordinate system can be created simply by setting the machine coordinate system zero point position offset
when the power is turned ON (when the communication is restarted).
• No ladder program for position control is required.
For the system that satisfies the conditions to enable the Simple Absolute Infinite Length Position Control (described in
the following section), select the Simple Absolute Infinite Length Position Control.
( 2 ) Conditions to Enable the Simple Absolute Infinite Axis Position Control
Set the Maximum Number of Absolute Encoder Turns Rotation (fixed parameter 38) to a value that satisfies the fol-
lowing equation to enable the Simple Absolute Infinite Axis Position Control.
The reset number of turns will differ depending on whether the command unit is set to pulse or millimeters/degrees/
inches as shown below.
The settings above can be used to enable Simple Absolute Infinite Axis Position Control with a Σ-II or Σ-III SERVO-
PACK.
For SVB-01 Modules version 1.16 or earlier and built-in SVB Modules version 2.44 or earlier, the reset number of
turns must be an integer (remainder = 0)
Simple Absolute Infinite Length Position Control cannot be used by the
Σ-I SERVOPACK.
System That Does Not Satisfy the Above Condition
The system that does not satisfy the above condition cannot use the Simple Absolute Infinite Length Position Control.
Prepare the ladder program for position control. Refer to 9.4.5 Infinite Length Position Control without Simple Abso-
lute Positions for details.
POSMAX
0
(No.38: Maximum Number of Absolute Encoder Turns Rotation +1)
Reset number of turns
= An integer (remainder = 0)
When the Reference Unit is Pulses When the Reference Unit is mm, deg, or inch
No. 10: Infinite Length Axis Reset Posi-
tion (POSMAX)
No. 10: Infinite Length Axis Reset Position (POSMAX) ×
No. 8: Servo Motor Gear Ratio
No.36: Number of Pulses per Motor
Rotation
No. 6: Travel Distance per Machine Rotation ×
No. 9 Machine Gear Ratio