$8\mathrm{.}5)$ Given the following machine control sequence:

Start, $A^{+},10s$ delay, $($ repaet $3$ times ;$(B^{+},C^{+},20s$ delay $,C^{-},B^{-})),A^{-}.$

$($a$)$ Re$-$arrange the machine sequence using on$-$delay and$/$or off$-$delay functions.

$($b$)$ Develop $RLL$ for the given machine sequence assuming non$-$sustain outputs for all

cylinders?.

$($c$)$ Modify the RLL for the given machine sequence assuming non$-$sustain control output

signal for cylinder A only?

$($d$)$ Modify the machine RLL program given in $($b$)$ to have Auto$/$Man cycles selector switch

and two$-$position selector switch for each Man. Output operation? Specify the type of

the selector switches used in this application?