10 - 14
MELSEC-A
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
Da.10
Shape
Da.11
Start data No.
Da.12
Special
start command
Da.13
Parameter
1st point 1: Continue 1 5: FOR loop 2
2nd point 1: Continue 10 0: Normal start –
3rd point 0: End 50 7: NEXT start –
•
•
* The "condition data Nos." have been set in "
Da.13
Parameter".
(b) Positioning data setting example
Axis 1 position-
ing data No.
Da.1
Operation pattern
1 01: Continuous positioning control
2 01: Continuous positioning control
3 00: Positioning complete
•
10 11: Continuous path control
11 00: Positioning complete
•
50 01: Continuous positioning control
51 00: Positioning complete
•
(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 .)
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