Mitsubishi Electronics QD75D, QD75P Restrictions when using the Next start, 6th point, 7th point

10HIGH-LEVEL POSITIONING CONTROL

10.3.8 Restrictions when using the NEXT start

MELSEC-Q

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]

Start block data	Da.12 Special start
	command
1st point	Normal start
2nd point	FOR
3rd point	Normal start
4th point	NEXT
5th point	Normal start
6th point	Normal start
7th point	FOR
8th point	Normal start
9th point	NEXT
•
•

[Operating examples with nesting structure]

Start block data	Da.12 Special start
	command
1st point	Normal start
2nd point	FOR
3rd point	Normal start
4th point	FOR
5th point	Normal start
6th point	Normal start
7th point	NEXT
8th point	Normal start
9th point	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.

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