Simulink tutorial

Example of a simple Simulink program

Output

Basic Simulink Block

Inport, Outport, and Subsystem blocks

• Inports are port that serve as links from outside

a system into the system

• Outports serve as a link from the system to the

outside

• A subsystem represents a subsystem of the

system that contains it

Example

• Subsystem, Input, output port

The Ground Block

• To connect blocks whose input ports are not

connected to other blocks.

Example:

Terminator Block

• Terminator block can be used to cap block

whose output ports are not connected to other

blocks

Example:

Constant and Product Blocks

• The constant block is used to define a real or

complex value. The block accepts scalar, vector

(1-D array), or matrix (2-D array)

• The Product block performs multiplication or

division of its inputs.

Example of the constant and product

blocks

The Divide Block

• We can the set the product to be the divide block.

The Scope Block

• The scope block displays waveforms as

functions of simulation time. The scope block

can have multiple y-axes with a common time

range

The Bus Creator and Bus Selector Blocks

• We use Bus Creator blocks to create signal

buses similar to the multiplexer.

• We use Bus Selector blocks to access the

components of a bus similar to the demultiplexer

• Bus creator and Bus selector blocks are used

with bus signal. Mux and Demux are used with

vectors

Example of Bus Creator

y(t) = sin(2*t)

diff_y(t)=2*cos(2*t)

tnt_y(t)=-1/2*cos(2*t)

Output waveform

The Mux and Demux Block

• Multiplexing is a method of sending multiple

signal streams of information on a carrier at the

receiver end.

• A demultiplexer performs the reverse operation

of multiplexer.

• Time division multiplexing (TDM) : multiple

signals are carried over the same channel in

alternating time slot.

Example of multiplexing

Digital Mux-Demux pair

Example of the Demux

Switch Box

• The switch will output the first input or the third

input depending on the value of the second

input.

• The second input is called the control input

specified by the Function Block Parameters

the following options are available:

u2 >= threshold,

u2 > threshold,

u2 ~= 0

The example of Switch Block

The output

The Sum Block

• The block performs addition and subtractions on

its inputs.

• This block can add or subtract scalar, vector, or

matrix inputs.

• We can specify the operation (+) or (-) and the

number of inputs.

Example of the Sum Block

• Operation A + B - C

The Gain Block

• The gain block multiplies the input by a constant

value (gain).

• The input and gain can each be: a scalar, vector,

or matrix

The example of the gain block

• A = [1 -1 2], B = [2 3 4]

The Relational Operator Block

• The relational operator block performs the

specified comparison of its two inputs.

• The relation can be selected from the Relational

Operator paramters. Operation descriptions:

== True if the first input is equal to the second input

~= True if the first input is not equal to the second input

< True if the first input is less than the second input

<= True if the first input is less than or equal to the second input

>= True if the first input is greater than or equal to the second input

> True if the first input is greater than the second input

Example of the relational operator

A = [ 2 -3 5; 1 0 -1; -2 1 0]; B= [2 1 -2; -3 0 1;5 -1 0];

The Logical Operator Block

• The logical operator block performs the specified

logical operation on its inputs.

• Operation description:

AND - True if all inputs are true

OR - True if at least one input is true

NAND - True if at least one input is false

NOR - True when no inputs are true

XOR - True if an odd number of inputs are true

NOT - True if the input is false and vice versa

Example

When A = 1, B = 0, C = 1 (variables are constant block)

The Saturation Block

• The saturation block establishes the upper and

lower bound for an input signal.

• When the input signal is within the range

specified by the lower and upper limit, the input

signal passes unchanged.

• Otherwise, the input is clipped to upper or lower

bound.

An example

When x = 0: 1 : 6; y = 3. *x .^2;

The upper limit is set at 75 and lower limit is at 1.

The Integrator Block

• The Integrator block integrates its input and is

used with continuous-time signals.

The Unit Delay Block

• The unit delay block delays its input by the

specified sample period.

• The output equals to the input delayed by one

sample

The Discrete Time Integrator Block

• The discrete time integrator block performs

discrete time integration or accumulation of a

signal.

• We use this block in discrete-time signal

An example of the model

Waveform for the model

Data Type Conversion

• Built-in data types supported by Matlab

Data Type Conversion Block

• The data type conversion block converts an

input signal of any Simulink data type to the data

type and scaling specified by the block’s output

data type parameter

• Two possible data support:

- Real World Value (RWV)

- Stored Integer (SI)

Data types

• RWV treats the value as V = SQ + B where S is

the slope and B is the bias.

• SI treats the input as a stored integer. It will use

only the Q value.

An example of Data Type Conversion

Data Type Conversion 1

Output Data Type

• Output data type is set to fixdt(1,8,2^-3,0).

• It indicates that the output data are expressed in

fixed point.

• The first number indicates a sign number

• The second number is the word length

• The third number is slope

• The last number is the bias

Example

• The integer number 63 is represented by:

00111111 in binary.

• With the slope of 2^-3, it becomes 00111.111

whose value is 7.875

• Hence S = -3, Q = 00111.1112 and B = 0.

Another example

Question?

Simulink tutorial - Asian Institute of...

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