4 . S e q u e n t i a l F u n c t i o n C h a r ts
M N 0 5 0 0 3 0 0 3 E F or m o r e i nf o r m a t i o n v i s i t : www. e a t o n. c o m
4 - 5
4.
Common Step Point
-
These compose the bulk of the SFC
-
Step Points in a procedure other than the Initial Step Point
-
Ladder logic is contained within the Step Points.
-
Available addresses depend on the processor.
5. Convergence/Divergence
-
The ways to transition to and from multi-steps
-
Two types of each: Alternative and Simultaneous
-
Alternative: Each step has a unique transition condition
-
Simultaneous : All steps share one transition condition
1.
No divergence:
Move from S0 to S20
according to the transition
condition 0.
2.
Alternative Divergence:
This is an OR condition. Move
from S0 to
either
S20
or
S21
by different transition
conditions 0 and 1.
3.
Simultaneous Divergence:
This is an AND condition.
Move from S0 to
both
S20
and
S21 by the single
transition condition 0.
Divergence moves from one step to many.
Содержание ELC-PB
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