controlling the running state of motor of single phase motor by pressing start and stop push button that means motor should remain in on state after start push button is pressed .we have to check if motor is running normaly by pushing test pushbutton

 this problem of motor require latching in contacts or interlocking we can say 

 now we have 3 inputs and a single output



now inputs are 

x0=start pushbutton which start motor 

x1=stop push button which stop the motor 

x2=this is error checking of motor to plc 



now if i talk about output that will be y0 that is motor 



now ladder diagram of this will be 

|----------| |--------|/|----------()---------|

             x0         x1            y0

      |             |          |

      |-----||----|          |

             y0

      |-----||-------------|

            x2

addressing will be 

now X0=I:0/0

       X1=I:0/1

       Y0=O:0/0

       X2=I:0/2