Question $3$

When you push T$1$ on the operating panel, valve V$1$ opens and a reservoir starts filling up with water. At the same time, motor M of the mixer starts working. When the reservoir fills up$,$ water level goes up and reaches the level set by a sensor S$1.$ V$1$ valve closes and motor of the mixer stops. Valve V$2$ opens then, and a reservoir starts emptying. When water level falls below the level set by a sensor S$2,$ valve V$2$ closes. By repeating the same cycle four times, a lamp that indicates end of the four cycles is activated. Pressing T$1$ key will start a new cycle.

$($a$)$ Make a list of the address inputs and outputs you would use to implement the process described above

$($b$)$ Using a wiring diagram show how you would wire a PLC to run the plant described above

$(3+12$ marks$)$