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MELSEC-Q
9 MAJOR POSITIONING CONTROL
[3] Positioning control method when the control unit is set to "degree"
1) Absolute system
(a) When the software stroke limit is invalid
Positioning is carried out in the nearest direction to the designated
address, using the current value as a reference.
(This is called "shortcut control".)
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°.
315° 45°
315°
45°
Moved from 315° to 45°
Moved from 45° to 315°
The shortcut control is invalidated and positioning in a designated direction is carried
out by the "
Cd.40
ABS direction in degrees".
This function can perform only when the software stroke limit is invalid. When the
software stroke limit is valid, an error "ABS direction in degrees illegal" (error code:
546) occurs and positioning is not started.
To designate the movement direction in the ABS control, a "1" or "2" is written to the
"
Cd.40
ABS direction setting in the unit of degree" of the buffer memory
(initial value: 0).
The value written to the "
Cd.40
ABS direction in degrees" becomes valid only when
the positioning control is started.
In the continuous positioning control and continuous path control, the operation is
continued with the setting set at the time of start even if the setting is changed during
the operation.
Buffer memory address
Name Function
Axis 1 Axis 2 Axis 3 Axis 4
Initial
value
Cd.40
ABS direction in degrees
The ABS movement direction in the
unit of degree is designated.
0: Shortcut (direction setting
invalid)
1: ABS clockwise
2: ABS counterclockwise
1550 1650 1750 1850 0