AND CONVERGENCE FUNCTION FROM 2
SFC BRANCHES (CONV AND 2)

This function is used to link a single operating phase
after simultaneous operating phases.
- If a status token is present at INPUT 1 or INPUT 2 it is stored
immediately in the function step, switching OUTPUT 1 to ON.
- If a status token is present at INPUT 3 or INPUT 4 it is stored
immediately in the function step, switching OUTPUT 2 to ON.
- These tokens are stored in each step until the TRANSITION input
changes to the ON state and if, and only if, each step contains a status token.
In this case, each token is merged into a single status token which crosses the
transition and disappears from each step. Each CONV AND STEP OUTPUT (1 and 2)
is set to OFF and the token is then available on the TRANSITION OUTPUT to be
stored in one or more steps connected downstream of this output.
- If there is no status token present at either input (INPUT 1 and
INPUT 2) and if the step does not already contain a status token, the step
remains empty and the CONV AND STEP OUTPUT 1 output is set to OFF.
- If there is no status token present at either input (INPUT 3 and
INPUT 4) and if the step does not already contain a status token, the step
remains empty and the CONV AND STEP OUTPUT 2 output is set to OFF.
- If both steps do not contain a status token simultaneously, when the
transition is activated (TRANSITION changes to ON) nothing happens and each
step remains in its initial state.
The non-connected inputs are set to neutral values for
the function, i.e.:
- The non-connected TRANSITION is maintained in the OFF state:
transition blocked
- The non-connected INPUT 1, INPUT 2, INPUT 3 or INPUT 4 is maintained
with no token present in the step input.
Parameterisation box/Comments
tab
For more information about SFC charts and this function,
see: SFC chart help.
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