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Blocks with sequence numbers (N..) are allowed in loops.
Blocks beginning with the words ENDI, ENDW, ENDF, EXIT or UNTIL must not
include ISO programming functions.
One of words DO, THEN or ELSE can be followed by ISO programming functions in
a same block.
Example:
WHILE L1 < 3 DO G91 X12
or
WHILE L1 < 3
DO G91 X12
The following sequence is refused:
WHILE L0 < 3 G91 X10
DO
Not allowed in a
conditional instruction