8 SFC PROGRAM
8.2 Structure
89
8
• In a selective transition, a convergence can be omitted by a jump transition or end transition.
The above program can be created by changing the steps other than the step of the leftmost branch to end
steps and changing the end step of the leftmost branch to a jump sequence.
For the operation method for changing steps, refer to the following.
GX Works3 Operating Manual
Simultaneous sequence (divergence/convergence)
All the steps branched from one step are activated simultaneously. When all the steps immediately before convergence are
activated and the common transition becomes TRUE, the active state transitions to the next step.
When transition (2) becomes TRUE during action of step (1), step (3) and step
(4) are sequentially executed. When the transition (5) becomes TRUE, a jump
sequence to step (1) occurs.
Item Description
Divergence When the transition (2) becomes TRUE while the step (1) is active, both of the
step (3) and step (4) are activated at the same time.
The step (1) becomes inactive. However, if it is a coil HOLD step [SC], the step
holds the coil output or action according to its attribute.
Processing will proceed to step (7) when the transition (5) becomes TRUE and
to step (8) when the transition (6) becomes TRUE.
Convergence After the step (1) and step (2) immediately before the convergence become
active, the transition (3) is checked, then becomes TRUE, the step (4) is
activated.
The step (1) and step (2) become inactive. However, if it is a coil HOLD step
[SC], the step holds the coil output or action according to its attribute.
(1)
(3) (4)
(7) (8)
(2)
(5) (6)
To Next Page
Loading...
