9 - 96
MELSEC-Q
9 MAJOR POSITIONING CONTROL
Switching over from speed control to position control
(1) The control is switched over from speed control to position control by
executing the external command signal set in "speed-position switching
signal".
(2) Besides setting the positioning data, the "
Cd.24
Speed-position switching
enable flag" must also be turned ON to switch over from speed control to
position control. (If the "
Cd.24
Speed-position switching enable flag" turns
ON after the speed-position switching signal turns ON, the control will continue
as speed control without switching over to position control. The control will be
switched over from speed control to position control when the speed-position
switching signal turns from OFF to ON again. Only position control will be
carried out when the "
Cd.24
Speed-position switching enable flag" and
speed-position switching signal are ON at the operation start.)
Buffer memory address
Setting item
Setting
value
Setting details
Axis 1 Axis 2 Axis 3 Axis 4
Cd.24
Speed-
position
switching
enable
flag
1
Set "1: Switch from speed control
to position control when the
external command signal [CHG]
turns ON.".
1528 1628 1728 1828
Speed-position switching signal setting
The following table shows the items that must be set to use the external command
signals (CHG) as speed-position switching signals.
Buffer memory address
Setting item
Setting
value
Setting details
Axis 1 Axis 2 Axis 3 Axis 4
Pr.42
External
command
function
selection
2
Set the "2: speed-position and
position-speed switching
requests".
62 212 362 512
Cd.8
External
command
valid
1
Set "1: Validate external
command".
1505 1605 1705 1805
Refer to Section 5.2 "List of parameters" and Section 5.7 "List of control data" for information on the
setting details.
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