
B–61863E/15
3. CONFIGURATION AND OPERATION
OF STEP–SEQUENCE
PROGRAMS
STEP SEQUENCE FUNCTION
995
It combines two or more divergent paths to the main sequence.
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D A convergence of simultaneous sequence is processed as follows.
S10
P120
S21
When the transition P120 evaluates
true, step S10 and S20 are terminated
and step S21 is activated.
S20
D Wait processing is processed as follows.
case1 )
S10
P109
S20
When the transition P109 evaluates true
unless both of step S11 and S16 are active,
control does not pass to step S20.
When the transition P109 evaluates true
while both of S11 and S16 are active, S11
and S16 are terminated and S20 is
activated. In the case, P109 provides the
termination conditions for both S11 and S16.
P110
S11
S15
P115
S16
case2 )
S11
P110
S20
To specify the termination conditions for
S11 and S16 separately, place the condi-
tions in P111 and P116 and specify two
dummy steps, S12 and S17, as shown
A dummy step also requires a step number
and subprogram number. Alsospecify a
dummy transition condition, which becomes
always true, in P110.
P111
S12
(dummy)
S16
P116
S17
(dummy)
3.7
CONVERGENCE OF
SIMULTANEOUS
SEQUENCE