Simulink Signals Essay

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About Signals A signal is a time varying quantity that has values at all points in time. You can specify a wide range of signal attributes, including: Signal name Data type (for example, 8-bit, 16-bit, or 32-bit integer) Numeric type (real or complex) Dimensionality (one-dimensional, two-dimensional, or multidimensional array) Many blocks can accept or output signals of any data or numeric type and dimensionality. Other blocks impose restrictions on the attributes of the signals that they can handle. In Simulink®, signals are the outputs of dynamic systems represented by blocks in a Simulink diagram and by the diagram itself. The lines in a block diagram represent mathematical relationships among the signals defined by the block diagram. For example, a line connecting the output of block A to the input of block B indicates that the signal output of B depends on the signal output of A. Simulink block diagrams represent signals with lines that have an arrowhead. The source of the signal corresponds to the block that writes to the signal during evaluation of its block methods (equations). The destinations of the signal are blocks that read the signal during the evaluation of the block methods (equations). Note Simulink signals do not travel along the lines that connect blocks in the same way that electrical signals travel along a wire. This analogy is misleading because it suggests that a block diagram represents physical connections between blocks, which is not the case. Simulink signals are mathematical, not physical, entities, and the lines in a block diagram represent mathematical, not physical, relationships among blocks. Creating Signals Create a signal by adding a source block to your model. For example, you can create a signal that varies sinusoidally with time, by dragging an instance of the Sine block from the Simulink Sources library into

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