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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 LEDs with toggle
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switches. So let's look at the example
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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 1
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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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switch 2 is off, then LED 3 will be off
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and LED 4 will be on. So when we will
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turn on toggle switch one, two LEDs will
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turn on. And when we will turn off
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switch one, one LED will turn off but
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the other will remain on. And then when
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we will turn uh on the switch two then
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the LED 2 will turn on and LED 3 will be
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on. And then uh when we will turn off
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switch two LED 3 will uh turn off and
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other LED will turn on. So for this
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example we will use normally open
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contacts, normally close contacts with
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that we will be also using memory bits
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and also we will be also implementing
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logic. So let's move to coders where we
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will draw a ladder diagram for this
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So I will open cortices.
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So let's create a new project. First I
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will click on new project.
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You can choose a template as standard
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project. You can also select the uh
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location and name. So let's say it's
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11 and click on okay. So the new project
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is created. After that we need to select
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device and PLC programming. So we you
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can select device from this drop-down
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list and select PLC programming as glad
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logic diagram and click on okay.
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After that click on PLC programming
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here. So here we will be drawing ladder
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I will insert a normally open contact
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here that will be for toggle switch one.
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So I will write toggle
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and then we will insert a coil here for
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LED one. So this will be LED one. So
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when toggle switch one is turned on LE
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we will insert one more network below
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below and we will insert one more
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normally open contact that will be for
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toggle switch one and this toggle switch
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one will turn on LED 2 as well. So for
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that we will insert a coil. This will be
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LED 2. So sorry this will be LED 2. LED
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So we will delete this here.
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Okay. So 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 we will turn off toggle
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should turn off but LED 2 should remain
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on. For that we will latch LED2 here. So
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we will insert a contact parall to this
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toggle switch one and this normally open
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contact will be LED 2. So when toggle
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switch one is turned off, LED 1 gets off
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but LED 2 remains on. And then we will
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insert one more network. Sorry, we will
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insert one more network below. Okay. So
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here we will use a normally open contact
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for toggle switch two toggle switch
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two. So when toggle switch two is turned
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on motor three and motor four get
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sorry motor 3 gets on. So for this we
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will insert a coil here. This will be
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sorry LED 3 LED 3 gets on. Okay.
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And with that LED 2 gets off. So for
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that we will use a normally close
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contact here. And this will be toggle
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Okay. So when toggle switch two is
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turned on, LED 3 gets on and LED 2 gets
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off. And when toggle switch two is
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turned off, LED 3 gets off but LED 4
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should get on. So for that we will
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insert one more network here below this
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So we'll insert a normally open contact
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for this toggle switch
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two. And this toggle switch two will
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make a memory bit two. So we'll insert a
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coil that will be used as
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Okay. And this memory bit
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will be last here. So we will insert a
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contact parallel to it. And this will be
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memory bit. Okay. So this memory bit
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will be used in another network that
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will be inserted below this we'll use
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this memory bit as normally open
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contact. So this will be memory bit and
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this memory bit when uh when true and
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when uh this uh toggle switch to is
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turned off. So for that we will use a
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normally close contact
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So LED 4 gets on. So we'll insert a coil
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that will be for LED 4. Okay. So when
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toggle switch one is turned on, LED one
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gets on. With that LED 2 gets on. The
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signal passes through this. LED 1 gets
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on. The signal passes through this. And
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this toggle switch two is false. So this
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is a normally closed contact. In false
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state, the signal will pass through
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this. As a result, this LED2 gets on.
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And when toggle switch one is turned off
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the the signal will not pass through
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this. As a result LED 1 gets off but LED
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2 remains on due to this lagging. And
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then when toggle switch two is turned on
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the signal will not pass through this.
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As a result LED 2 gets on. And with that
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the signal will pass through this. As a
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result LED 3 gets on. Okay. And with
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also that memory bit gets true. Okay.
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And when toggle switch turned off the
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signal will not pass through this LED 3
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gets off but this memory bit is true and
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toggle switch two is false. So LED get
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LED 4 gets on. So we'll generate code
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Go to online start simulation and after
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that we will log in. Yes.
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and then we will start.
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Okay. So when toggle switch one is
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turned on. So we'll click here turn it
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through. Go to debug and write values.
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You can see here LED 1 and LED 2 gets
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on. And when when we will turn off
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toggle switch one, go to debug and write
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values. LED 1 gets off but LED2 remains
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on. And then when toggle switch two is
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turned on, go to debug and write values.
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LED 2 gets off and LED 3 gets off. With
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that this memory bit also gets true. And
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when we will turn off toggle switch two,
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we will click here make it false and go
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to debug and write values. This memory
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bit remains true due to latching. And
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with that this toggle switch to false
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LED 4 gets off. It was all about this
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example. Thank you for watching.
