Restrictions When Using The Next Start - Mitsubishi Electric RD77MS2 User Manual

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 153 Repeated start (FOR loop), Page 154 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 [Da.13] Special start instruction
1st point Normal start
2nd point FOR
3rd point Normal start
NEXT  FOR of the 2nd point
4th point
5th point Normal start
6th point Normal start
7th point FOR
8th point Normal start
NEXT  FOR of the 7th point
9th point

[Operating examples with nesting structure]
Start block data [Da.13] Special start instruction
1st point Normal start
2nd point FOR
3rd point Normal start
4th point FOR
5th point Normal start
6th point Normal start
NEXT  FOR of the 4th point
7th point
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.
4 HIGH-LEVEL POSITIONING CONTROL
4.3 Setting the Block Start Data
4
155