Mitsubishi Electric MELSEC-Q Series User Manual page 494

The following table shows the "[Md.20] Feed current value" during speed-position
switching control (INC mode) corresponding to the "[Pr.21] Feed current value
during speed control" settings.
"[Pr.21] Feed current value during
speed control" setting
0: Do not update feed current value
1: Update feed current value
2: Zero clear feed current value
V
Speed control Position control
Feed
Maintained Updated
current
value
(a) Feed current value not updated
There is 1ms from the time the speed-position switching signal is turned ON to the
time the speed-position switching latch flag ([Md.31] Status: b1) turns ON.
Speed-position switching signal
Speed-position switching latch flag
(1) The following table shows the items that must be set to use the external
[Pr.42]
[Cd.45]
(Note): Set the external command signal [DI] in "[Pr.95] External command signal selection".
Feed current value during speed-position switching control (INC mode)
V
t
Feed
current
value
(b) Feed current value updated
Switching time from speed control to position control
Speed-position switching signal setting
command signals [DI] as speed-position switching signals.
Setting item
External
command
function selection
External
[Cd.8]
command valid
Speed-position
switching device
selection
Refer to Section 5.2 "List of parameters" and Section 5.7 "List of control data" for information on the
setting details.
[Md.20] Feed current value
The feed current value at control start is maintained during speed
control, and updated from the switching to position control.
The feed current value is updated during speed control and position
control.
The feed current value is cleared (set to "0") at control start, and
updated from the switching to position control.
Speed control
Position control
Updated
ON
OFF
OFF
1ms
Setting
Setting details
value
Speed-position, position-speed
2
switching request.
Validates an external
1
command.
Use the external command
0 signal for switching from speed
control to position control.
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Chapter 9 Major Positioning Control
V
Speed control
t
Feed
0
current
value
(c) Feed current value zero cleared
ON
Buffer memory address
62+150n
4305+100n
4366+100n
Position control
t
Updated from 0