WOLFRAM SYSTEMMODELER

# Logical

Library of components with Boolean input and output signals # Package Contents Logical 'and': y = u1 and u2 Logical 'or': y = u1 or u2 Logical 'xor': y = u1 xor u2 Logical 'nor': y = not (u1 or u2) Logical 'nand': y = not (u1 and u2) Logical 'not': y = not u Breaks algebraic loops by an infinitesimal small time delay (y = pre(u): event iteration continues until u = pre(u)) Output y is true, if the input u has a rising edge (y = edge(u)) Output y is true, if the input u has a falling edge (y = edge(not u)) Output y is true, if the input u has a rising or falling edge (y = change(u)) Output y is true, if input u is greater than threshold Output y is true, if input u is greater or equal than threshold Output y is true, if input u is less than threshold Output y is true, if input u is less or equal than threshold Output y is true, if input u1 is greater than input u2 Output y is true, if input u1 is greater or equal than input u2 Output y is true, if input u1 is less than input u2 Output y is true, if input u1 is less or equal than input u2 Trigger zero crossing of input u Logical Switch Switch between two Real signals Transform Real to Boolean signal with Hysteresis On-off controller Triggered trapezoid generator Timer measuring the time from the time instant where the Boolean input became true A basic RS Flip Flop Terminate simulation if condition is fulfilled

# Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This package provides blocks with Boolean input and output signals to describe logical networks. A typical example for a logical network built with package Logical is shown in the next figure: The actual value of Boolean input and/or output signals is displayed in the respective block icon as "circle", where "white" color means value false and "green" color means value true. These values are visualized in a diagram animation.

# Wolfram Language

In:= `SystemModel["Modelica.Blocks.Logical"]`
Out:= 