
3.CREATING AND EDITING SEQUENCE PROGRAMS B-63484EN/05
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Jump
A jump is processed in conjunction with a transition to control the
execution of steps.
• A jump-to label [Ln] is specified.
• The step at a jump destination becomes active.
• The jump destination must be within the same program.
• It is impossible to jump from outside to inside a parallel branch
and vice versa.
• It is impossible to jump from one parallel branch flow to another.
Label
A label represents a jump destination.
• A jump-to label [Ln] is defined.
Block step
The block step is a step for representing a subprogram described with
step sequences.
• A step number [Sn] necessary to control execution and a
subprogram [Pm] that describes actual processing are defined for
a block step.
• A step number must be assigned to a step.
• Duplicate step numbers cannot be used in a program.
• There must always be a transition below a block step.
Transition P102 cannot be omitted. A subprogram for
P102 must be a dummy transition that is always
satisfied.
Write a condition for terminating step S21 in transition
P121.
If transition P102 is exchanged with P121, processing
at step S21 does not work normally.