
10.STEP SEQUENCE FUNCTION B-63983EN/02
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10.3.3 Transition
A transition specifies the conditions governing the transition from the
step to the next step.
[Display]
Pn
[Contents]
· Only one transition is required between steps.
· Transition between steps is performed as described below.
S1
P102
P101
S2
While S1 is activate, only S1 and P101 are
executed.
Other steps and transition are not executed.
When the transition P102 evaluates true unless
S2 is not being executed, the state is ignored.
When the transition P101 evaluates true, control
passes fro S1 to S2. In this case, when the
condition is true, S1 is terminated regardless of
the state of S1, and S2 is activated.
· When a signal is set to 1 in a transition, it remains the state even
if the control is transferred to the subsequent step. To set the
signal to 0, use another subprogram to do so.
[Example]
Refer an example described on the Step function (Sub sec.
10.3.1).