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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 be controlling four lights using a
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single toggle switch. So let's start.
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Example eight. If toggle switch one is
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on then light one, light two, light
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three and light four will be on. If
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toggle switch one is off then light one,
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light two, light three and light four
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So in this example we will use normally
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open contacts. With that we will be also
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using memory bits and set coil.
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So let's move to codicis where we will
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draw a ladder diagram for this example.
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I need to create a new project. Let's
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create a new project.
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And I will start standard project the
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template for this. and click on okay.
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After that you need to you know change
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the PLC programming to latter logic
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diagram and then click okay.
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After that go to PLC programming here
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and here we will draw the ladder
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diagram. So firstly I will insert a
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normally open contact here and a set
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We'll insert a set coil. Insert set
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coil. And this normally open contact
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will be toggle switch one. Toggle
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And then this coil will be a memory bit.
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Let's say memory bit.
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And after that we will insert one more
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network. Here I will right click and
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click on insert network below.
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And in this network we will use this
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memory bit as normally open contact. So
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we will insert a contact here. And this
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And then we will insert some coils. So I
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will insert a coil here. And then I will
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open the branch here.
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Here. And then insert a coil. Then one
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more. I will insert once again branch.
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So for now this contact will be light
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one. This is light one. Okay. And then
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this will be light two. And then we need
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to insert two more coils here.
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So I will click here and then insert co
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uh insert branch below and then add a
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coil here. And this coil will be light
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three. Okay. And then we need to insert
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one more branch here below. And then
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insert a coil. And this coil will be
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So when toggle switch one is turned on,
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the signal will pass through it and it
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will make this memory bit true. And when
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this memory bit is true, the signal will
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pass through this. And as a result, this
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light one, light two, light three and
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light four, all the lights gets on. All
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the lights turn on. And then when the
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toggle switch one is turned off, it will
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not allow signal to pass through it. As
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a result, this memory bit should turn
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off. It should turn pause. But as you
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as you can see here, we have used.
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We have used a me a set coil for this
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this memory bit remains true even when
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we turn off this toggle switch one. So
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when toggle switch one is turned off
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this memory bit remains on and when
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memory bit remains on the signal still
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passes through this. As a result this
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light one, light two, light three and
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light four remains on. So in short when
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toggle switch one is turned on all the
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lights light one light two light three
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and light four turns on and when toggle
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switch one is turned off these lights do
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not turn off light one remains on light
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two light three and light four also
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now let's generate code
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and let's go to online and start
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simulation and then I need to log in
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So when toggle switch one so we need to
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first start here and we will we will
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turn toggle switch one as true. So we
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will click here turn it to true and then
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force values uh or we can click on write
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values and you can see here this memory
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bit gets true when we turn on the toggle
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switch one and when memory bit gets true
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all the lights turn off. As you can see
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here, light one is true. The state of
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light two is also true. Light three and
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light four all the lights are on. And
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then so what happens is that toggle
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switch one is turned on. The signal
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passes through this. As a result this
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memory bit gets true and we have used
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that memory bit here as normally open
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contact. So it is true. The the signal
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will pass through this. As a result,
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this light one, light two, light three
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and light four gets on.
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So when I turn off this toggle switch
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one, I need to click here. When it is
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gets false here, then go to debug and
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write values. You can see here toggle
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switch one. The state of toggle switch
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one is false. But the state of memory
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bit is still true. As you can see here
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it is true. Why is it true? Because we
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have used a set coil for this memory
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bit. So a set coil keeps that output
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true even when the out uh even when the
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input gets paused even when we turn off
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the output. So this memory bit remains
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true and when this memory bit remains
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true here as normally open contact the
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signal will still pass through this. As
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a result, this light one, light two,
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light three and light four, all the
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lights remain on. It was all about this
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example. Thank you for watching.
