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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.

[Operating examples without nesting structure] [Operating examples with nesting structure]

Da.13

FOR

Da.13

FOR

Start block data

1st point

2nd point

3rd point

4th point

5th point

6th point

7th point

8th point

9th point

Special start instruction

Normal start