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welcome to automation community. Today
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in this video we are going to discuss an
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example in which we will control lamps
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using switches. So let's start.
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Example six. If toggle switch one is on
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then lamp one will be on. If toggle
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switch two is on then lamp two will be
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on and lamp one will be off.
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If toggle switch three is on then lamp
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three will be on and lamp two will be
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off. Similarly if toggle switch four is
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on then lamp four will be on and lamp
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three will be off. Note do not turn the
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toggle switches off once turned on.
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So for a lamp one to be on, switch one
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should be on and switch two should be
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off. So turning on switch two will turn
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off lamp one. Similarly switch two will
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turn on lamp two and turning on switch
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three will turn off lamp two and then a
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light three will get on when switch
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three is turned on and turning on switch
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four will turn off uh lamp three.
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And similarly switch four will turn on
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at lamp 4. So for this example we will
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be using normally open contacts and
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normally closed contacts. So let's move
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to codices where we will draw a ladder
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diagram for this example and also we
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Firstly, let's create a new project.
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Select template as standard project and
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Choose a PLC programming ladder logic
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diagram and click on okay.
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Double click on PLC programming and here
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we will draw the ladder diagram. So
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firstly we will insert a normally open
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contact and this will be switch one
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and this switch one will turn on lamp
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one. So here we will click here and then
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click on insert coil and this will be
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Okay. So turning on switch one will turn
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on switch uh sorry lamp one and then
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turning on switch two will turn off lamp
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one. So we will use here a normally
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closed contact for switch two. So this
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and click on okay. Similarly this switch
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two will turn on lamp two. So I will
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right click here and insert network
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below this network. And here we will use
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a normally open contact. We'll insert a
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normally open contact. And this normally
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open contact will be for switch two.
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And then we'll insert a coil. I will
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insert a coil here. And this coil will
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So turning on switch two will turn on
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lamp two. And turning on switch three
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will turn off lamp two. So we'll use a
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normally closed contact for switch
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three. That will turn off lamp two. So
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we'll insert a normally closed contact
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here. And this will be for switch
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And also this switch three will turn on
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lamp three. So we will insert one more
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network here. I will insert network
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below this network and I will insert a
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co uh normally open contact and a coil.
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So I will insert a coil here and this
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normally open contact will be switch
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three. So switch three will turn on lamp
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and this lamp three will be turned off
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by switch four. So we'll use a normally
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closed contact here. And this normally
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closed contact will be for switch four.
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So turning on switch four will result in
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turning off of lamp 3. And this switch
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four when we turn it on it will turn on
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lamp 4 as well. So we will insert one
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more network. Insert network below. And
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I will insert a normally open contact
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So this normally open contact will be
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and this coil will be lamp 4. Click on
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okay. So when I turn on switch one, the
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signal will pass through this and
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initially switch two is in false state
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and this switch two is used as normally
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closed contact and this normally closed
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contact in false state will allow signal
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to pass through it and as a result this
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lamp one will get on.
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And then when I turn on switch two, this
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normally closed contact will go to true
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state. And in true state and normally
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closed contact does not allow signal to
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pass through this. As a result, this
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But the switch two here we have used it
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as normally open contact. It will allow
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signal to pass through this. And
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initially switch three is in false
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state. It is a normally closed contact.
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In full state, it will allow signal to
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pass through this. As a result, this
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lamb two gets on and with that the
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switch three will turn on lamp three. As
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the switch three is a normally open
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contact in in true state
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in true state it will allow signal to
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pass through this and initially
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and at that time switch four four will
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be false. The state of switch four will
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be false and this switch four is used as
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normally close contact. So a normally
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close contact in false state will allow
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signal to pass through this. As a result
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this lamb three will get on. And
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similarly when switch four gets on this
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switch four this contact does not allow
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signal to pass through this. As a result
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this lamb three gets off and but the
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switch four is uh we have used it as
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normally open contact. In true state it
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will allow signal to pass through this.
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As a result this lamb four gets on. So
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now let's generate a code for this here.
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Go to online start simulation and then
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And then start. So initially all the
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lamps are off. And when I turn on switch
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one, let's debug it. Write values. And
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you can see lamp one gets on. And then
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when I turn on switch two, when I turn
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on switch two, we will go to debug and
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write values. You can see lamp one gets
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off but two gets on. And similarly when
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I turn on switch three, when I turn on
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switch three, lamp two gets off and lamp
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three gets on. And then when I turn on
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what will happen? Lamb three gets off.
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Lamb four gets on. Let's see. Let's
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debug it. right values. Yes, lamb three
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got off and lamb three gets on. It was
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all about this example. Thank you for
