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Learn PLC Logic Development Using CODESYS with practical examples, PLC programming techniques, ladder logic, and industrial automation concepts. Perfect for students and beginners.
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0:00
[Music]
0:05
Hello everyone, welcome to automation
0:07
community. Today in this video we are
0:10
going to discuss an example in which we
0:13
will be drawing ladder diagram for a
0:15
boolean expression.
0:17
So let's look at the example first.
0:20
Example 16. Y2.
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Example 16. Y is equal to A dot B dot C
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plus T E not dot M.
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So for this example we have six inputs A
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B C D E and F. So for input A, C and E
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we will be using normally closed
0:47
contacts. Okay. So A, B and C will be
0:50
connected in series. D, E and F will be
0:53
connected in series but D, E and F will
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be connected in series with each other
0:59
but parallel to A, B and C. So for
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output Y to be on we have two uh you
1:07
know options either A should be off, B
1:10
should be on, C should be off or D
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should be on, E should be off and F
1:16
should be on. Okay. So let's move to
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codices where we will draw a ladder
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diagram for this exam.
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I will open codices.
1:38
Let's create a new project. Click on new
1:40
project
1:41
and we need to write the name of the
1:44
project that is sample
1:50
16. Then we can also select the location
1:53
where this project will be saved. Okay.
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And then we can also select its
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template. Let's keep it standard project
2:01
and click on okay.
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So the project has been created. We can
2:06
also select the device uh which we will
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be using. We can select this from our
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from this list. For now I will be using
2:14
cords control when v3 64 cords and then
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the PLC programming there is a list of
2:21
different language. We are using ladder
2:24
logic diagram LD and click on okay.
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So now let's click double click here TLC
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programming. So here we will be drawing
2:35
ladder diagram for the boolean
2:36
expression. So we have a kn first that
2:40
means we have to use a normally closed
2:42
contact for a not. So this will be a
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so this will be a and it represents a
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not and then we we have b dot b dot b
2:54
means we have to connect b in series. So
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we will connect we'll insert a normally
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open contact as a normally uh sorry for
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B that that represents dot B and then we
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have dot C not dot means in series
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C not means a normally closed contact
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for C. Okay so this will be C. So when
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uh we are using normally closed contacts
3:20
we are implementing not logic gates.
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Okay. A not C not understood? A should
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be off, C should be off and B should be
3:29
on. Then the output Y will turn on. So
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we have inserted a coil here for the
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output Y. Great. Click on okay. And
3:40
after that we have plus. Okay. Plus
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means
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so. So the inputs written after plus
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means they have to be inserted here in
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parallel to these A B C. Okay. So we
3:55
need to select all these inputs A by uh
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pressing the shift button. Click on
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every this contact and then insert
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contact parallel. Okay. So great. So
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this normally open contact will be for
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D. Okay. So this is D. Then we have E
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not okay dot D dot. Dot means in series
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to D. Okay. Then we have E not. E not
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means a normally closed contact for E.
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And then we have dot. Dot means in
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series. So we have to connect F. Okay.
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So we'll insert a normally open contact
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for F. Okay. So for output Y to be on, A
4:39
should be off, B should be on, and C
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should be off. So if A is off, it is a
4:44
normally closed contact. The signal will
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pass through this. B is on, it is a
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normally open contact. In true state,
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the signal will pass through this. And C
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is off, C is a normally closed contact.
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In a false state, the signal will pass
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through this. As a result, this output Y
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will be on. So here we are implementing
5:02
or logic gate. Okay. So we have a choice
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either A, B and C are controlling Y or
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D, E and F are controlling Y. So the
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second choice is D should be on A should
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be off. F should be on. If D is on the
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signal passes through this E A is off.
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So this is a normally closed contact. In
5:22
false state the signal will pass through
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this. F is on. It is a normally open
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contact. The signal will pass through
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this. The output Y will turn on. So now
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let's go to uh sorry let's generate code
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first. here.
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Go to online and start simulation.
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After starting the simulation, we need
5:44
to log in here. Click on yes
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and then we will click here to start the
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simulation. So for now this output Y is
5:54
off, isn't it? This output Y is off. We
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can also see it here. The output Y is
6:00
off. So to turn on we need to to turn on
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the output Y we need to uh make output
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sorry input B true. So let's debug it
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and write values and you can see here
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the output Y turn on. Okay so here you
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can see A is false B is true and C is
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false. So the the signal is passing
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through these contact these three
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contacts. As a result this output Y is
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on. If I turn on A, I will click here,
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make it true. Go to debug and write
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values. So A is true but it is a
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normally closed contact. In true state,
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it will not allow signal to pass through
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this. As a result, this output Y will be
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on. Okay. So when A is true, no matter
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what is the state of B and C, Y will not
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turn on. Similarly, if A is false and C
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is true, what will happen? The output Y
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will not turn on. A is off, the signal
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passes. B is on, the signal passes. But
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C is on at a normally closed contact. It
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will not allow it will never allow the
7:04
signal to pass through this. As a
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result, this output Y will turn off.
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Okay, great. So we will turn off A as
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well. Sorry, we will turn off B and C as
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well. So let's go to debug and write
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values. And now instead of A, B and C,
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we can also use D, E, and F. So when I
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turn on D, when I turn on D, click here.
7:26
true. Go to debug and write values. When
7:29
I turn on D, output Y will not turn on.
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So we need to uh turn on F as well and
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keep E keep the input E false. Okay,
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let's go to debug and write values. So
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what will happen? The signal will flow
7:45
through this. E is off as a normally
7:47
closed contact. In false state, the
7:49
signal passes through this. F is also
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true. It is a normally open contact. The
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signal passes through this. As a result,
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this output Y will turn on. Great. So if
7:59
I turn on E, if I turn on E, go to debug
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and write values, you can see here the
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signal will not pass through this
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because this is a normally closed
8:07
contact. In true state, a normally
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closed contact never allow signal to
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flow through this. As a result, the
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output Y will not turn on. So E should
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be off. E should be off and D and F
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should be on. Let's debug it and write
8:22
values. Boom. Output Y will turn turn
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on. It was all about this example. Thank
8:29
you for watching.
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[Music]
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