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Today in this video we are going to draw
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a ladder diagram for a boolean
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expression. Y is equal to a dot b dot c
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plus d + e. So we have one output that
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is y and we have five inputs a b c d and
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e. So firstly I will open cordises.
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After that double click on the PLC
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So here we will be drawing ladder
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diagram. So firstly we have to uh draw
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ladder diagram for a dot b dot dot c.
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That means we have to connect these
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three inputs in series. So firstly I
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will insert a contact here and this will
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then we have dot. Dot means in series.
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Okay. So uh then we have B not B not
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means there is a negated contact and
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normally closed contact. So we'll insert
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a negated contact and this will be B.
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And after that we have a dot C. The dot
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means in series here. So we will use a
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cut a normally open contact and this
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will be C. Now we have to connect uh
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these contacts in parallel. So we will
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uh uh select these inputs.
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Okay. Uh uh I just press the shift
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button and select all of these and then
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insert contact parallel just like this.
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And we will delay this. Okay. So we have
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a dot b dot dot c then we have plus that
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means we have to connect in parallel
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then we have d not. Okay. So this will
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be a normally closed contact. So we will
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delete this normally open contact. So
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this will be d. Okay. So as of now uh
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it's a dot b dot c plus d. Then we have
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one more plus that means we have to
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connect in parallel. Okay. So we will
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insert a contact para. Okay. So we have
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plus then e. So for e we will be using a
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normally open contact. So this will be a
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and after that we will insert a coil. So
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we'll insert a coil and this coil will
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be Y. So output Y will turn on when A is
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on, B is off and C is on. The output Y
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will turn on. So instead of A, B and C,
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Y will turn on when D is off. If D is
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on, the output Y will not turn off. And
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we can also control this output Y with
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the input E only. So when input E is
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turned on, the output Y will turn on.
