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MELSEC-Q
9 MAJOR POSITIONING CONTROL
Position-speed switching signal setting
The following table shows the items that must be set to use the external command
signals (CHG) as position-speed 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.
Changing the speed control command speed
In "position-speed switching control", the speed control command speed can be
changed during the position control.
(1) The speed control command speed can be changed during the position control
of position-speed switching control.
A command speed change request will be ignored unless issued during the
position control of the position-speed switching control.
(2) The "new command speed" is stored in "
Cd.25
Position-speed switching
control speed change register" by the sequence program during position
control.
This value then becomes the speed control command speed when the
position-speed switching signal turns ON.
Stop signal
t
Speed change
enable
Position-speed switching
signal
ON
OFF
Position
control
Speed
control
Position control startPosition-speed switching control start
0
V2
OFF
Position-speed switching
latch flag
Status: b5
ON
V3
V2 becomes the speed control command speed.
Setting after the position-speed
switching signal ON is ignored.
Position-speed
switching control
speed change register
Md.31
ON
Cd.25
OFF
Fig. 9.20 Speed control speed change timing