Functional diagram

The functional diagram , or block diagram , is the chart of the signals of a system. It is composed of blocks connected by lines of action . It is used mainly in Automatique and Treatment of the signal. The lines of action have a direction which imposes a relation of Causalité; this is why the functional diagrams are badly adapted to the representation of physical systems, in which the subsystems interact mutually.

Block diagram in ordering of process

Block

The block , or element , is represented by a rectangle with the action of the element (e.g. $d/dt$, $G\; (S)$, $H\; (S)$…). It is sometimes accompanied by a description (e.g. shunting device, integrator…) and of the symbol of the entry signal (or variable of Automatic control in ) and of the output signal (or variable ordered ).

Line of action

The line of action represents the advance of a signal . It is sometimes accompanied by the symbol (e.g. $x$, $u\_1$…) or of description (e.g. tension, position…) signal.

Comparator

The comparator , or addition, is often represented with the sign + (addition) or - (subtraction).

Connection

The connection , or not of derivation (or also junction ) is represented with a point at the place of the connection.

Block diagram in chemical engineering

See too

• Algebra of the diagrams
• Jump Graph

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