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9 MAJOR POSITIONING CONTROL
Position-speed switching control start
Position-speed switching
signal
Cd.25
Position-speed
switching control
speed change register
Position-speed switching
latch flag
Md.31
Status: b5
Stop signal
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.
Setting
Setting item
value
External
command
Pr.42
function
selection
External
Cd.8
command
valid
Refer to Sections 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 "
control speed change register" by the PLC program during position control.
This value then becomes the speed control command speed when the
position-speed switching signal turns ON.
Position
control
Speed change
enable
OFF
0
ON
OFF
OFF
Fig. 9.20 Speed control speed change timing
Setting details
Set the "2: speed-position and
2
position-speed switching
requests".
Set "1: Validate external
1
command".
Speed
control
Position control start
ON
Setting after the position-speed
switching signal ON is ignored.
V2
V3
V2 becomes the speed control command speed.
ON
9 - 103
MELSEC-Q
Buffer memory address
Axis 1
Axis 2
62
212
1505
1605
Cd.25
Position-speed switching
Axis 3
Axis 4
362
512
1705
1805
t
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