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1756-PM003H-EN-E, SFC and ST Programming Languages ...

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Design a Sequential Function Chart 4-49<br />

Figure 4.9 Options for Execution Control<br />

This…<br />

step_1<br />

step_2<br />

tran_1<br />

tran_2<br />

…executes like this<br />

Execute current active steps only<br />

Execute until FALSE transition<br />

step_1<br />

step_1<br />

tran_1<br />

false<br />

return to<br />

OS/JSR<br />

tran_1<br />

false<br />

return to<br />

OS/JSR<br />

true<br />

true<br />

return to<br />

step_1<br />

step_1<br />

last scan<br />

step_2<br />

step_2<br />

tran_2<br />

false<br />

return to<br />

OS/JSR<br />

tran_2<br />

false<br />

return to<br />

OS/JSR<br />

true<br />

true<br />

return to<br />

OS/JSR<br />

step_2<br />

step_2<br />

last scan<br />

Publication <strong>1756</strong>-<strong>PM003H</strong>-<strong>EN</strong>-E (excerpt from <strong>1756</strong>-PM001H-<strong>EN</strong>-P) - August 2005

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