Restrictions When Using The Next Start - Mitsubishi QD75P1N User Manual

10 HIGH-LEVEL POSITIONING CONTROL

10.3.8 Restrictions when using the NEXT start

The "NEXT start" is a instruction indicating the end of the repetitions when executing
Section 10.3.6 "Repeated start (FOR loop)" and Section 10.3.7 "Repeated start (FOR
condition)".
The following shows the restrictions when setting "6: NEXT start" in the " block start
data".
(1) The processing when "6: NEXT start" is set before execution of "4: FOR loop" or
"5: FOR condition" is the same as that for a "0: block start".
(2) Repeated processing will not be carried out if there is no "6: NEXT start"
instruction after the "4: FOR loop" or "5: FOR condition" instruction. (Note that an
"error" will not occur.)
(3) Nesting is not possible between "4: FOR loop" and "6: NEXT start", or between
"5: FOR condition" and "6: NEXT start". A warning "FOR to NEXT nest
construction" (warning code: 506) will occur if nesting is attempted.
[Operating examples without nesting structure]
Special start instruction
Start block data Da.13
1st point
2nd point
3rd point
4th point
5th point
6th point
7th point
8th point
9th point
[Operating examples with nesting structure]
Normal start
FOR
Normal start
NEXT
Normal start
Normal start
FOR
Normal start
NEXT
A warning will occur when starting the 4th
point "FOR".
The JUMP destination of the 7th point "NEXT"
is the 4th point. The 9th point "NEXT" is
processed as normal start.
10 - 16
Start block data Da.13 Special start instruction
Normal start
1st point
2nd point
3rd point Normal start
4th point
5th point Normal start
6th point Normal start
7th point
8th point Normal start
9th point
MELSEC-Q
FOR
FOR
NEXT
NEXT