MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Uživatelská příručka stáhnout pdf (Strana 26)

2 Writing S-Functions As M-Files

2-2

Introduction

An M-file that definesan S-Function blockmust provide informationabout the

model; Simulink needs this information during simulation. As t he simulation

proceeds, Simulink, the ODE solver, and the M-file interact to perform specific

tasks. These tasks include defining initial conditionsandb lockcharacteristics,

and computing derivatives, discrete states, and outputs.

Simulink p rovides a template M-file S-function that includes statements that

define necessary functions, as well as comments to help you write the code

needed for your S-function block. This template file,

sfuntmpl.m,isinthe

directory

toolbox/simulink/blocks under the MATLAB root directory.

M-file S-functions work by making a sequence of calls to S-function routines,

which a re M-code functions that perform tasks required by your S-function.

This table lists the S-function routines available to M-file S-functions.

Table 2-1: M-File S-Function Routines

S-Function Routine Description

mdlInitializesizes

Defines basic S-Function block

characteristics, including sample times,

initial conditions of continuous and discrete

states, and the

sizes array.

mdlDerivatives

Calculat esthe derivativesof the continuous

state variables.

mdlUpdate

Updates discrete states, sample times, and

major time step requirements.

mdlOutputs

Calculates the outputs of the S-function.

mdlGetTimeOfNextVarHit

Calculates the time of the next hit in

absolute time. This routine is used only

when you specify a variable discrete-time

sample time in

mdlInitializeSizes.

mdlTerminate

P erforms any necessary end of simulation

tasks .

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 209 210

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User's Manual

Table of Contents

1. INTRODUCTION

2. INSTALLATION

SCSI ID Selector

SCSI Termination

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Feeding Roller

4. TROUBLESHOOTING

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5. SPECIFICATIONS

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Uživatelská příručka Strana 26

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