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Hello everyone, welcome to automation
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community. Today in this video we are
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going to discuss an example in which we
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will control buzzers over toggle
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switches. So let's start.
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Example two. If toggle switch one and
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toggle switch two are on, then buzzer
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one and buzzer two will be on. If toggle
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switch two and toggle switch three are
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on, then buzzer two will be off and
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buzzer three will be on. So we have
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three toggle switches and three buzzers.
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So buzzer will one will be on when
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switch one and switch two both are on
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and buzzer two will also be on when the
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both switches are on.
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And then if we turn on switch two and
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toggle switch three then buzzer two will
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be off and buzzer 3 will be on. So for
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this example we will use normally open
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contacts as well as normally close
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So let's move to cortices where we will
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draw a ladder diagram. For this example
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I will open cordices here.
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Firstly, we need to create a new
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project. I will click on new project and
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we'll select the template as standard
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project and we can rename the project
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example 2 and then click on okay.
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And then we need to select Lal logic
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diagram here and then click on okay
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and then double click here on PLC PRG.
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So here we will draw the ladder diagram.
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So firstly we will insert a normally
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open contact for toggle switch one. So I
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and then we will insert one more
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normally open contact here
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and this will be toggle switch two
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So when toggle one, toggle switch one
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and toggle switch two are on then LED
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one and LED 2 will turn on. Sorry buzzer
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one and buzzer two will be on. So here
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we will insert a coil one coil for
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buzzer one buzzer one and then we need
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to add one more coil here for buzzer
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two. So I will click here and then
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So this will be buzzer two.
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So for buzzer one and buzzer two to be
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on both the toggle switches should be
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on. Toggle switch one and toggle switch
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two should be on. And then when switch
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two uh and switch three are on, toggle
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switch two and toggle switch three are
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on then LED 3 will turn on.
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So we will insert a network below and
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then we will insert two normally open
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So this normally open contact will be
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and this will be toggle switch three. So
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when toggle switch two and toggle switch
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three are on then alarm sorry this
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buzzer three will be on.
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So here we will write as buzzer 3 and
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with that buzzer two should turn off. So
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to turn off buzzer three sorry to turn
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off buzzer two we will add a normally
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closed contact here and this will be
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So when toggle switch one and toggle
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switch two are on then buzzer one will
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be on. So when these two toggle switches
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are on the signal will pass through this
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when their state will be true then
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buzzer one and buzzer two both will be
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on. As this toggle switch three is in
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pole state and it is a normally closed
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contact. In pole state it will allow
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signal to pass through it. As a result,
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this buzzer two will also turn on.
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So for now, we have turned on these two
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switches and buzzard one and buzzer two
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are on. And then when we turn on toggle
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switch three as well, when toggle switch
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two and toggle switch three are on, then
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buzzer three will be on with that buzzer
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So let's generate code here.
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and then we'll go online and start
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After that we'll log in, click on yes
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So as you can see here all the buzzers
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are off. So we need to turn on toggle
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switch one. So when we turn on toggle
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switch one we'll debug it right values
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nothing will happen buzzer one and two
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remains off. So we need to turn on
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toggle switch two as well. Let's debug
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We will firstly turn it and then debug
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and write values. And you can see here
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buzzer one and buzzer two gets on.
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So what happens is that when we turn on
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the toggle switch one in true state this
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is a normally open contact in true state
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it will allow signal to pass through it.
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So this toggle two needs to be turned
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on. So when we turn on this toggle
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switch two this is also a normally open
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contact. So in true state it will allow
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signal to pass through this. As a result
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this buzzer one gets on. And then here
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we have used a normally closed contact
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for toggle three. Toggle switch three.
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As you can see here toggle switch three
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is in false state. So when normally
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closed contact is in false state it
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allows signal to pass through it.
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And you can see here buzzer 2 is also
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And then to turn on the buzzer three
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these two inputs should be on. As you
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can see here toggle two toggle switch
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two is on already on and we need to turn
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on toggle switch three here. So I will
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uh change it to true and then debug and
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write values and you can see buzzer
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So when toggle switch three is on you
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can see it is a normally open contact in
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true state it will allow signal to pass
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through this. As a result, this buzzer 3
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gets called. And this toggle switch
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three. It is a normally closed contact.
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When turned on, when it state is true,
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it will not allow signal to pass through
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this. As a result, this buzzer two gets
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off. It was all about this example.
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Thank you for watching.
