3 MAJOR POSITIONING CONTROL
3.1 Overview of the Major Positioning Controls
75
3
Positioning control method when degree is set as the control unit
■
When the absolute system is used
• When the software stroke limit is invalid
The positioning is performed in the direction nearest to the specified address, using the current value as a reference. (This
control is called shortcut control.)
When the rotation angle is 180
, the rotation direction is determined depending on the start point position.
To specify the positioning direction (when the shortcut control is not performed), invalidate the shortcut control using "[Cd.40]
ABS direction in degrees" or "[Da.28] ABS direction in degrees". The positioning in the specified direction can be performed.
This function can be executed when the software stroke limit is invalid. When the software stroke limit is valid, Illegal setting of
ABS direction in unit of degree (Error code: 19A5H) occurs and the positioning is not started.
With "[Cd.40] ABS direction in degrees" or "[Da.28] ABS direction in degrees", the setting value of the reference axis is
applied to the reference axis and interpolation axis. Even if a unit other than degree is set for the reference axis, the setting of
the reference axis is applied to the interpolation axis as follows (for the 3-axis linear interpolation control (ABS3)).
Start point position
Rotation direction
0
Start point < 180
Clockwise
180
Start point < 0
Counterclockwise
Axis
Unit setting
"[Cd.40] ABS direction in
degrees"
Rotation direction in degrees
Reference axis
pulse
1: ABS clockwise
Interpolation axis 1
degree
1: ABS clockwise
Interpolation axis 2
degree
1: ABS clockwise
315°
45°
315°
45°
Moved from 45° to 315°.
Moved from 315° to 45°.
Example
(1) Positioning is carried out in a clockwise direction when the current value is moved from 315° to 45°.
(2) Positioning is carried out in a counterclockwise direction when the current value is moved from 45° to 315°.
Summary of Contents for MELSEC iQ-R RD75P4
Page 1: ...MELSEC iQ R Positioning Module User s Manual Application RD75P2 RD75P4 RD75D2 RD75D4 ...
Page 2: ......
Page 13: ...11 MEMO ...
Page 19: ...17 CONTENTS INDEX 588 REVISIONS 592 WARRANTY 593 TRADEMARKS 594 ...
Page 498: ...496 13 PROGRAMMING 13 2 List of Labels Used ...
Page 503: ...13 PROGRAMMING 13 4 Program Example 501 13 ...
Page 514: ...512 13 PROGRAMMING 13 4 Program Example Restart program Parameter data initialization program ...
Page 515: ...13 PROGRAMMING 13 4 Program Example 513 13 Flash ROM write program Error reset program ...
Page 516: ...514 13 PROGRAMMING 13 4 Program Example Stop program ...
Page 565: ...APPENDICES Appendix 4 Operation Examples of When the Remote Head Module Is Mounted 563 A ...
Page 597: ......