.Buildings.Controls.OBC.CDL.Logical.Pre

Breaks algebraic loops by adding a delay of the output without advancing time (y = pre(u): event iteration continues until u = pre(u))

Information

This block delays the Boolean input by an infinitesimal small time delay and therefore breaks algebraic loops. In a network of logical blocks, in every closed connection loop, at least one logical block must have a delay, since algebraic systems of Boolean equations are not solvable.

This block returns the value of the input signal u from the last event iteration. The event iteration stops once both values are identical, i.e., if u = pre(u).

Revisions

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