The diagram in Figure shows a workstation for the clamping and drilling of parts. When the start button is pressed the piece is clamped, after 3 seconds of being clamped is drilled and then released.
If the stop button is pressed then both cylinders return to their retracted positions and the drill motor stops.
Following the system specifications:
a. Draw a suitable PLC wiring diagram assigning I/Os as necessary.
b. Determine the theoretical size of the pneumatic cylinder when it operates at a pressure of 5 bar providing a maximum clamping force of 300N. In order to regulate cylinder speed, the decaying pressure on the side of the cylinder's piston open to atmosphere should be approximately 1.5bar and can be considered to work against the cylinder.
c. Implement the control strategy in ladder programming (LD).
