Introduction to Xcos

Rupak Rokade

Indian Institute of Technology Bombay

National Workshop on ScilabFr. C. Rodrigues Institute of Technology,Vashi

December 1, 2010

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What is Xcos?

A Scilab connected object simulator

Used for block diagram simulation

Excellent GUI for Data processing

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Xcos window

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Xcos palette browser

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First order Systems

Vo(s)

Vi (s)=

1

RCs + 1

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Step response of ’First order Systems’

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Xcos for open loop simulation (first order)

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Xcos Response for open loop simulation

Xcos simulation response for Transfer function 12s+1

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Second order Systems

Vo(s)

Vi (s)=

1

s2 + LCs + 1

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Continued.....

This second order transfer function can also be written in terms ofωn,undamped natural frequency and ζ ,damping ratio.

C (s)

R(s)=

ωn

s2 + 2ζωns + ω2n

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Step response of ’Second order Systems’

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Xcos for open loop simulation (second order)

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Xcos Response for open loop simulation

Xcos simulation response for Transfer function 1s2+2∗0.2∗1∗s+1

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Xcos Response for open loop simulation

Xcos simulation response for Transfer function 1s2+1

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Xcos for plotting overlapped multiple plots

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Multiple plots in Xcos

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Using scifunc in Xcos

Xcos simulation diagram with scifunc block

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Configuring Scifunc block

Open the block properties of Scifunc block by double clickingon it

Click on ok and you will be prompted to ask to enter thefunction name.

Write, y = sine(u1)and click ok five times.

Open editor, write the code as shown in the slide 19 and saveit with some name (e.g. sine.sci).

After making sure that you are in the same directory wherethe .xcos and .sci file resides, run the .sci file.

After running the .sci file, open the xcos code and execute it.

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Function code

Remember to use the same function name in the .sci as wellas .xcos file.

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Response of Xcos simulation diagram with scifunc block

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Xcos for closed loop controllers

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Xcos response for closed loop controller

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Thank You

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