MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guia do Utilizador descarregar pdf (Página 63)

Overview of the C MEX S-Function Routines

3-19

Data View of S-Functions

S-function blocks have input and output signals, parameters, internal states,

plus other generalwork areas. In general, blockinputs and outputsarewritten

to, and read from, a block I/O vector. Inputs can also come from

• External inputs via the root inport blocks

• Ground if the input signal is unconnected or grounded

Block outputs can also go to the external outputs via the root outportblocks. In

addition to input and output signals, S-functions can have:

• Continuous states

• Discrete states

• Other working areas such as real, integer or pointer work vectors

S-function blocks can be parameterized by passing parameters them using the

S-function block dialog box.

The following picture shows the general mapping between these various types

of data:

Figure 3-4: The Relationships Among S-Functions and S-Function Data

Block

Block I/O

External

Outputs

(root

outport

External

Inputs

(root

inport

Ground

States

Work

Vectors,

RWork,

IWork,

PWork,

Parameters

blocks)

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guia do Utilizador Página 63