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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 LEDs using two
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toggle switches. So let's look at the
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Example 11. If toggle switch one is on
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then LED one and LED 2 will be on. If
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toggle switch one is off then LED one
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will be off and LED 2 will be on. If
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toggle switch two is on then LED 2 will
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be off and LED 3 will be on. If toggle
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two or switch two is off then LED 3 will
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be off and LED 4 will be on. That means
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we have four LEDs and two toggle
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switches. And when toggle switch one is
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turned on, LED one and LED 2 both turn
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on. And when it is turned off, one LED
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turns off but the other LED remain on.
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And that LED 2 will be turned on using
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toggle switch two. And third LED turns
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on. And that third LED is turned gets
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turned off when that toggle switch two
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is turned off. And with that LED 4 turns
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So for this example we will be using
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normally open contacts uh normal coils
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and we will be also using subset coils
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and reset coils. With that we will be
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also using memory bits and normally
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closed contacts. So let's move to
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codices where we will draw a ladder
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diagram for this example.
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So I will open codices.
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So firstly we need to create a new
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Click on new project.
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We can uh uh type the name of the
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project here and we can also select
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template as data project and click on
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After that we can also select device and
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PLC programming. So we will be uh using
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ladder logic diagram and click on okay.
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After that double click on this PLC
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programming. So here we will be drawing
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ladder diagram. So firstly we will
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insert a normally open contact for
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toggle switch one. So this will be
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switch one and this toggle switch one
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will turn on LED 1 and LED 2. So we will
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insert a coil. This coil will be for LED
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And there will be one more coil for LED
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2. But for LED 2 we will use a set coil.
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Before that we will insert a branch and
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add a set coil. So this set coil will be
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Okay. So this will be LED one.
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So we will delete this LED here.
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Okay. So when toggle switch one is
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turned on, LED one and LED 2 both gets
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on. And when this le uh when this toggle
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switch one is turned off, LED 1 gets off
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but LED 2 remains on. And after that we
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have one more toggle switch. For that we
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will insert network below here. And we
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will insert a normally open contact for
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toggle switch one. Sorry for toggle
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switch two. So this toggle switch two
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will turn off LED 2. So for that we will
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insert a reset coil here and this reset
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coil will be used for LED 2.
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LED 2. Okay. So this toggle switch two,
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this toggle switch two will turn off LED
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And after that this uh toggle switch two
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will turn on LED 3 as well. For that we
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will insert a branch here
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and add one more coil a normal coil here
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which will be le 3. LE3.
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we will insert one more branch here
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and for that we will insert a coil. That
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coil will be used as a memory bit. But
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this coil will not be a normal coil but
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a set coil that will be used for a
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for a memory bit. Okay. So this memory
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bit will be used to turn on LED 4 on
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turning off the toggle switch too. So we
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will insert network below here and we
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will insert a normally open contact for
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this memory pair. So this will be memory
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and this memory bit will turn on LED 4.
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For that we will insert a coil. So this
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will be LED 4. But this LED 4 will turn
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on when uh toggle switch is turned off.
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uh uh so firstly we need to turn on
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toggle switch two and then we need to
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turn off the toggle switch two then the
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LED 4 will turn on. So for that we will
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insert a normally closed contact for
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Okay. Great. So when toggle switch one
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is turned on LED one gets on because
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this toggle switch one.
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So when this toggle switch one is turned
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on this is a contact normally open
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contact. When it is in true state the
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the signal will pass through this. As a
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result, this LED one gets on and also
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this LED 2 gets on. And then when toggle
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switch two is turned off, the signal
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will not pass through this. As a result,
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this LED one gets off. But this LED2
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remains on because of the set coil we
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have used for LD2. So the set coil keeps
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the output on even when uh when we turn
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off the input. And then when we turn on
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the toggle switch two, the signal will
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pass through this and it will reset LED
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2 because we have used a reset coil
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here. So LED 2 gets off but LED 3 gets
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on. Okay. So with that this memory bit
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gets true but the current sorry the
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signal will not pass through this. As a
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result this LED 4 will not turn on
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because the toggle switch two is on. So
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the signal will not pass through this.
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But this memory bit gets true. So the
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signal will pass through this. But this
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toggle switch two is still true. As a
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result, this LED 4 is still false. So
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when we will turn off this uh switch to
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toggle switch two, this LED 3 gets off.
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But this memory bit remains true because
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of the set coil, it keeps the that
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memory bit true. Uh even when we turn
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off this toggle switch two. So this
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memory bit is true and this toggle
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switch two is false. So the signal will
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pass through this. As a result, this LED
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So we will generate code.
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start simulation. And after that we need
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So firstly when I turn on toggle switch
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one click here make it true then go to
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debug and write values. You can see here
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LED one and LED 2 both turned on but
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when I uh and when I turned off this
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toggle switch one go to debug and write
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turned off but LED 2 remained on because
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of the set guid. And then I need to turn
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on the toggle switch to keep it true and
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then go to debug and write values. You
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can see here LED 2 got false because of
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the reset coil which was turned on by
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toggle switch two. So this reset coil
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made the LED 2 to go off and with that
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this LED 3 got on and also this set coil
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uh this set coil for memory bits.
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And when I turn it off, when I turn off
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toggle switch two here, I will debug it
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and write values. This set coil keeps
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this memory bit true. And the signal
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flows through this. And this toggle
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switches false. So the signal also
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passes through this. As a result, this
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LED gets true. It was all about this
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example. Thank you for watching.
