Filter
Top Products
10 - 15
MELSEC-Q
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.
Block start data
Da.13
Special start instruction
1st point Block start
2nd point FOR
3rd point Block start
4th point FOR
5th point Block start
6th point Block start
7th point NEXT
8th point Block start
9th point NEXT
•
•
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
designated with point 9 is
executed.