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10 ADVANCED POSITIONING CONTROL
10.3.9 Restrictions when using the NEXT start
The "NEXT start" is a command indicating the end of the repetitions when executing
section "10.3.7 Repeated start (FOR loop)" and section "10.3.8 Repeated start (FOR
condition)".
The following shows the restrictions when setting "7: NEXT start" in the "start block
data".
(1) The processing when "7: NEXT start" is set before execution of "5: FOR loop" or
(2) Repeated processing will not be carried out if there is no "7: NEXT start"
(3) Nesting is not possible between "5: FOR loop" and "7: NEXT start", or between
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"6: FOR condition" is the same as that for a "0: normal start".
command after the "5: FOR loop" or "6: FOR condition" command. (Note that an
"error" will not occur.)
"6: FOR condition" and "7: NEXT start". A warning "FOR to NEXT nesting
structure" (warning code: 506) will occur if nesting is attempted.
Start block data Da.12 Special start command
1st point
Normal start
2nd point
3rd point
Normal start
4th point
5th point
Normal start
6th point
Normal start
7th point
8th point
Normal start
9th point
•
•
FOR
FOR
The JUMP destination of the
NEXT designated with points
7 and 9 is the FOR of point 4.
A warning will occur if the
NEXT
NEXT designated with point 9
is executed.
NEXT
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MELSEC-A
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Troubleshooting
