5. SEQUENCE PROGRAMS AND SFC PROGRAMS
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[Error Details]
(1) While start is attempted in the control mode allowing retracing, a minor error
305 is returned and retracing is controlled according to a speed limit value so
long as the absolute value of a negative change speed exceeds the speed limit
value.
(2) In constant speed control, retracing is controlled according to a speed
designated in the program (speed clamp control in speed change during
constant speed control) so long as the absolute value of a change speed
(minus) exceeds the speed designated in the servo program. In this case, no
error is returned.
(3) No control takes place after automatic deceleration starts. A minor error 303 is
returned.
[Example of Operation during Constant Speed Control]
The following describes the operations to be performed for a retracing request
made during constant speed control.
-1000
1000
P1
P2
P3
P1
P2
P3
Starting point
Start request SVST
Axis 2
Axis 1
CPSTART2
Axis 1
Axis 2
Speed
1000
ABS-2
Axis 1
10000
Axis 2
0
ABS-2
Axis 1
10000
Axis 2
10000
ABS-2
Axis 1
20000
Axis 2
10000
CPEND
Negative speed change
Start recption M200n
Speed change request
CHGV
Changed speed
Combined speed
Command in-position
(OFF)
Return operation to point P1
Stand by at point P1
Speed change "0"
receive in progress flag
[Servo program]
[Track]
When a negative speed change is attempted during positioning to P2, retracing is
performed up to P1 along the track designated in the program, then processing is
suspended there.
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