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9 MAJOR POSITIONING CONTROL
Position control
Speed
Updated
(a) Current feed value not updated
Current feed value during position-speed switching control
The following table shows the "
switching control corresponding to the "
control" settings.
Pr.21
Current feed value during
speed control" setting
0: Do not update current feed value
1: Update current feed value
2: Zero clear current feed value
Speed control
Speed
t
Maintained
Switching time from position control to speed control
There is 1ms from the time the position-speed switching signal is turned ON to the
time the position-speed switching latch flag ("
Position-speed switching signal
Position-speed switching latch flag
Md.20
Current feed value" during position-speed
Pr.21
The current feed value is updated during position control,
and the current feed value at the time of switching is
maintained as soon as position control is switched to
speed control.
The current feed value is updated during position control
and speed control.
The current feed value is updated from 0 at a control start,
and the current feed value is cleared (to "0") as soon as
position control is switched to speed control.
Position control
Speed control
Updated
(b) Current feed value updated
ON
OFF
OFF
9 - 101
MELSEC-Q
Current feed value during speed
Md.20 Current feed value
Position control
Speed
t
Updated from 0
(c) Current feed value zero cleared
Md.31
Status: b5") turns ON.
ON
1ms
Speed control
t
0
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