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7. Basic structures
Basic structures are grafcet configurations associated with the basic concepts of logic systems. They can be used to express successions of states, selections between several sequences, sequence parallelism, sequence jumps and resumptions, resource sharing and inter-sequence coupling.
7.1 Single sequence
A sequence is a succession of steps such as :
each stage, except the last, has only one downstream transition;
each step, with the exception of the first, has only one upstream transition, validated by a single step in the sequence.
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