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token switch : the token crosses the first active<br />

transition (at random if both Ea and Eb are true)<br />

Industrial Automation<br />

SFC: Switch and parallel execution<br />

token forking : when the transition Ee is true, the token<br />

is replicated to all connected states<br />

token join : when all tokens are present,<br />

and the transition Ef is true, one single token is forwarded.<br />

Ea<br />

"1"<br />

Sb<br />

Ed<br />

Sa<br />

Se<br />

Ee<br />

Sf Sg<br />

Ef<br />

70/100 2.3 Programmable Logic Controllers<br />

Eb<br />

Sc<br />

Ec<br />

Sd

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