Include a Start$-$Stop rung using N$.$O$.$ START and N$.$C$.$ STOP pushbuttons.

$$ A VALUE ramps upward from $0$ to $60$ in steps of $10$ and then ramps downward from $60$

to $0$ in steps of $20$ in a continuous operation.

$$ Each step occurs every $1$ second.

$$ When the VALUE reaches $60,$ the GREEN$\_$LIGHT will turn ON only for the interval of time

when it is $60.$

$$ When the VALUE reaches $0,$ the RED$\_$LIGHT will turn ON only for the interval of time

when it is $0.$

$$ One complete ramp cycle is from $0$ to $60$ and back to $0.$

$$ A counter counts the number of cycles.

$$ After $3$ cycles, the process will stop and the counter will reset to zero automatically.

$$ If the STOP$\_$PB is pressed at any time, use the MOV instruction to stop the process,

reset the counter and the VALUE.

Input field devices involved:

$1.$ N$.$O$.$ START$\_$PB $($Local:$1$:I.Data$\mathrm{.}0)$

$2.$ N$.$C$.$ STOP$\_$PB $($Local:$1$:I.Data$\mathrm{.}1)$

Output field devices involved:

$1.$ GREEN$\_$LIGHT $($Local:$2$:O$.$Data$\mathrm{.}0)$

$2.$ RED$\_$LIGHT $($Local:$2$:O$.$Data$\mathrm{.}1)$