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10
ADVANCED POSITIONING CONTROL
10.3.7 Repeated start (FOR loop)
In a "repeated start (FOR loop)", the data between the "start block data" in which "5:
FOR loop" is set in " Da.12 Special start command" and the "start block data" in which
"7: NEXT start" is set in " Da.12 Special start command" is repeatedly executed for
the No. of times set in " Da.13 Parameter". An endless loop will result if the No. of
repetitions is set to "0", and the data between "5: FOR loop" and "7: NEXT start" will be
repeated until the control is stopped by a "stop command".
(The No. of repetitions is set in " Da.13 Parameter" of the "start block data" in which
"5: FOR loop" is set in " Da.12 Special start command".)
Section (2) shows a control example where the "start block data" and "positioning data"
are set as shown in section (1).
(1)
Setting examples
(a)
Start block data setting example
Axis 1 start
block data
1st point
2nd point
3rd point
* The "condition data Nos." have been set in " Da.13 Parameter".
(b)
Positioning data setting example
Axis 1 position-
ing data No.
1
2
3
10
11
50
51
(2)
Control examples
The following shows the control executed when the "start block data" of the 1st
point of axis 1 is set as shown in section (1) and started.
<1> Execute the axis 1 "positioning data No. 1, 2, 3, 10, 11, 50, and 51".
<2> Return to the axis 1 "1st point start block data". Again execute the axis 1
"positioning data No. 1, 2, 3, 10, 12, and 50", and then stop the control.
(Repeat for the No. of times set in Da.13 .)
Da.11 Start
Da.10 Shape
data No.
1: Continue
1
1: Continue
10
0: End
50
Da.1 Operation pattern
01: Continuous positioning control
01: Continuous positioning control
00: Positioning complete
11: Continuous path control
00: Positioning complete
01: Continuous positioning control
00: Positioning complete
10 - 14
MELSEC-A
Da.12 Special
Da.13
start command
Parameter
5: FOR loop
0: Normal start
7: NEXT start
2
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