Question $4$:

Consider a double$-$tank water pretreatment system as shown in figure whose devices are listed in Table.

Sequence Table Analysis for Water Treatment with Double Tank

$\backslash$table$[[$Sequence$,$Input Devices,Output Devices,Analysis$],[\backslash$table$[[$START$],[$PB$]],$LS$1,$LS$2,\backslash$table$[[$CR$1],[($Pump $1)]],\backslash$table$[[$CR$2],[($Pump $2)]],$Changing,Virtual$],[1.$ Tank empty,$1,0,1,1,0,x,],[2.$ Filling tank,$1,0,0,1,0,,],[3.$ Tank full,$1,1,0,1,1,$X$,],[4.$ Emptying tank,$1,0,0,1,1,,]]$

Design a logic controller for each output $($CR$1$ and CR$2)$