* Electrical Control Pneumatic Cylinder * From the design shown in Figure, and B

Question

* Electrical Control Pneumatic Cylinder *

From the design shown in Figure, and Boolean Equation, Please explain the simulation of results.

Diagram 1:

the Design: Push start bottom and piston is at full retraction position (detected by LS1) the piston will move out and when it reaches the end of stroke (fully extended detected by LS2). If the stop switch is push the piston will retract immediately.

Rung 1: S= stop'. (start + s)

Rung 2: A= LS2. S (LS1+ A)

Rung 3: Sola=A  

Diagram 2:

the Design:

Piston 1 is position LS1, piston 2 is at position LS3

The start button is pushed  

The cylinder 1 will extend. If LS2 is detected pistion2 is extend and LS4 is detect piston 1 and piston 2 is retracted  

If the LS1 and LS3 detect, will go to step 3 and so on  

If the stop button is pressed the piston 1 and 2 are retract and stop.

Rung1: s=stop'. (start + s)

Rung2: A=(LS4.S)(LS3+LS1) + A

Rung3: B=(LS4.S) (LS2+S) + B

Rung4: Sola = A

Rung5: sola = B  

Explanation / Answer

For Diagram1

Rung 1

Stop is normally closed switch so when it is OFF the rung is connected. It is in series with start and S in parallel so, either S or start is ON the circuit is connected. And at last S is the output.

So, when stop is OFF & either S or Start ON we get output as S.

Rung 2

LS2 is limit switch when On energises/connect the circuit is in series to S a normally open switch. So, when S is On the circuit is connected. And then connected in series with LS1 & A in parallel so if either A or LS1 is On the circuit is connected.

So, we get output when LS2 in ON and S is On & eiither LS1 or A is On the circuit is connected and we get A as an output.

Rung 3

A normally open switch so when A is On we get output as sol A. And sol A is energised.

Diagram 2

Rung1

Stop is normally closed switch so when it is OFF the rung is connected. It is in series with start and S in parallel so, either S or start is ON the circuit is connected. And at last S is the output.

So, when stop is OFF & either S or Start ON we get output as S.

Rung 2

LS4 is limit switch when On energises/connect the circuit is in series to S a normally open switch. So, when S is On the circuit is connected. And then connected in series with LS3 & LS1 in series & A in parallel so if either A or LS3 & LS1 is On the circuit is connected.

So, we get output when LS4 in ON and S is On & eiither (LS3 & LS1) or A is On the circuit is connected and we get A as an output.

Rung 3

LS4 is limit switch when On energises/connect the circuit is in series to S a normally open switch. So, when S is On the circuit is connected. And then connected in series with LS1 & S in parallel so if either S or LS1 is On the circuit is connected.

So, we get output when LS4 in ON and S is On & eiither LS1 or S is On the circuit is connected and we get B as an output.

Rung 4

A is normally open switch so when A is ON the solA gets energised and we get output as sol A. else if A is OFF then sol A is denergised

Rung 5

B is normally open swith so when B is On it energises the solB and we get output as sol B. else if B is OFF we get output as denergised solB.

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