Scilab/C4/Simulating-a-PID-controller-using-XCOS/English-timed

Time	Narration
00:01	Welcome to the spoken tutorial on Simulating a PID controller using Xcos.
00:07	In this tutorial we will learn how to implement a PID controller in Xcos.
00:13	Ensure that Scilab is installed on your computer.
00:17	I am recording this tutorial on Ubuntu 16.04 64-bit Operating System and using Scilab 6.0.0
00:27	As a pre-requisite, watch the tutorial Xcos Introduction.
00:32	This tutorial will make you comfortable with the Xcos environment.
00:37	Also, we will use the firstorder.xcos file created in that tutorial.
00:43	Hence, it is important that you practice the tutorial before continuing so that you have the file with you.
00:50	Some basic knowledge of PID controller is necessary.
00:54	Assuming that you have satisfied the pre-requisites, let us begin with the tutorial.
00:59	First of all, we will launch Scilab.
01:03	Then go to Applications and select Xcos.
01:08	Or in your Scilab console window, type Xcos and press Enter.
01:15	By doing this, two windows will open. Palette Browser and # An Untitled-Xcos window
01:23	On the Untitled-Xcos window, click on File and then click on Open.
01:30	Browse to the directory where the file firstorder.xcos is saved.
01:36	Choose that file and click on Ok.
01:40	Now, Double-click on the transfer function block.
01:44	Check that you are using the same transfer function as I am using.
01:49	For me, the numerator is 1 and denominator is 2 asteric s plus 1 Which is 2 multiplied by s plus one.
02:01	Click on Ok.
02:03	Double-click on the Step block.
02:06	Check that you are using the same step input parameters as I am using.
02:11	For me the Step time is 1, the Initial value is 0 and the Final value is 2. Click on OK
02:20	Click on Simulation on the menu bar and choose Start to simulate the file.
02:27	Expect a similar plot which ensures that the file has no mistakes.
02:32	Switch to the Palette Browser.
02:35	Click on Continuous time systems category.
02:39	Drag and drop the PID block, which is here, inside the Xcos window
02:46	Click on the Signal Routing category.
02:49	Drag and drop the Mux block, which is here, inside the Xcos window.
02:55	Click on Mathematical Operations category.
03:00	Drag and drop the Summation block, which is here, inside the Xcos window.
03:07	Note that this block, by default, subtracts the second input from the first input.
03:14	We will use this default configuration of the summation block.
03:18	Click on the line joining the step input block and transfer function block.
03:24	Then press the Delete button to delete it.
03:27	Drag the step input block away from the transfer function block.
03:31	Click on the line joining the transfer function block and the cscope block.
03:36	Then press the Delete button to delete it.
03:40	Drag the cscope and clock input block away from the transfer function block
03:46	Place the PID block before the transfer function block.
03:50	Place the summation block before the PID block.
03:54	Place the Mux block between the transfer function block and cscope block.
03:59	Adjust the blocks, if required, so that they all come in a line.
04:04	Connect the step input block to the first input port of the summation block.
04:10	Note that this is the positive input port of the summation block.
04:15	Connect the output port of summation block to the input port of PID block.
04:21	Connect the output port of PID block to the input port of transfer function block.
04:27	Connect the output port of transfer function block to the lower input port of Mux block.
04:33	Connect the output port of Mux block to the input port of the cscope block.
04:39	Locate the line connecting the step input block and the summation block.
04:44	Connect the input port of Mux to that line.
04:48	Use the left mouse click to create line bends while making the connection.
04:54	Locate the line joining the transfer function block and the Mux block.
04:59	Connect the second input port of the summation block to that line. Use line bends wherever necessary.
05:08	Double-click on the PID block to open its parameter setting dialog box.
05:14	Here you can set the Proportional, Integral and Derivative gains.
05:18	Please note that the Integral gain should be considered as 1 by tau I, where tau I is the integral time.
05:28	We will use the default settings. Click on Cancel to use the default settings.
05:34	We are now ready to run the simulation.
05:37	Notice that we are using the step input block as a setpoint variable.
05:42	The PID controller will generate an input to the Transfer Function block.
05:47	It will be such that the output of the transfer function block matches the setpoint.
05:53	Click on Start simulation button available on the menu bar.
05:58	Expect a graphic window to open. It will have two variables plotted in a single plot.
06:07	The step plot is the setpoint which has a final value of 2.
06:12	The curved plot which is green in color, is the output of the transfer function which tries to meet the setpoint value of 2.
06:22	You can now change the PID settings and learn how they affect the output.
06:28	Pause the video here and solve the given exercises.
06:33	Implement a Proportional Controller only. That is, only P and not PID
06:40	Change the proportional gain such that the setpoint matches the output but without overshoots.
06:47	Include the output of the summation block in the plot.
06:51	You may use CMSCOPE to keep it separate.
06:55	Compare it visually with the output of the PID block
06:59	This brings us to the end of this tutorial. Let us summarize.
07:04	In this tutorial we learnt : To modify the firstorder.xcos file to implement a PID controller
07:12	Configure each block as per the simulation requirements
07:16	Setup the simulation parameters
07:19	The video at the following link, summarizes the Spoken Tutorial project. Please download and watch it.
07:26	The Spoken Tutorial Project Team conducts workshops and gives certificates. For more details, please write to us.
07:34	Do you have questions in THIS Spoken Tutorial?
07:37	Please visit http://forums.spoken-tutorial.org
07:43	Choose the minute and second where you have the question
07:47	Explain your question briefly
07:50	Someone from our team will answer them
07:53	The Spoken Tutorial forum is for specific questions on this tutorial
07:58	Please do not post unrelated and general questions on them
08:03	This will help reduce the clutter
08:05	With less clutter, we can use these discussions as instructional material
08:11	Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.. More information on this mission is available at the link shown.
08:23	This is Rupak Rokade signing off. Thanks for joining.

Contributors and Content Editors

PoojaMoolya