Restrictions When Using The Next Start - Mitsubishi Electric MELSEC iQ-FX5 User Manual

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Restrictions when using the NEXT start

The "NEXT start" is an instruction indicating the end of the repetitions when executing the repeated start (FOR loop) and the

repeated start (FOR condition).

(Page 140 Repeated start (FOR loop), Page 141 Repeated start (FOR condition))

The following shows the restrictions when setting "6: NEXT start" in the "block start data".

• 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".

• 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.)

• Nesting is not possible between "4: FOR loop" and "6: NEXT start", or between "5: FOR condition" and "6: NEXT start". The

warning "FOR to NEXT nest construction" (warning code: 09F1H) will occur if nesting is attempted.

[Operating examples without nesting structure]

Start block data

[Operating examples with nesting structure]

Start block data

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.

4 HIGH-LEVEL POSITIONING CONTROL

4.3 Setting the Block Start Data

[Da.13] Special start instruction

Normal start

Normal start

NEXT  FOR of the 2nd point

Normal start

Normal start

NEXT  FOR of the 7th point

[Da.13] Special start instruction

Normal start

Normal start

Normal start

NEXT  FOR of the 4th point

Normal start