Lab Description:

A PLC will control a MANUAL washer machine with three temperature settings $($Cold$,$ Med, Hot$).$

Description of Sequence of Operation:

a$.$ Select the setting for the temperature of the water with a $3-$position selector switch.

$-$ POS $1($I:$1/5)=$ Cold water

$-$ POS $2($No inputs$)=$ Warm water

$-$ Pos $\backslash (3(\backslash$mathrm$\{$I$\}$: $1/6)=\backslash )$ Hot water

b$.$ To start the cycle press the momentary PB $\backslash$#$1($I:$1/7).$ Turn ON the indicating light $($O:$2/10)$ while the washing cycle is running, turn the light OFF when the cycle is complete.

c$.$ When the cycle starts, open the corresponding water valves. For Cold water activate output O:$2/5.$ For Hot water activate output O:$2/6$ and for warm water activate both outputs.

Keep the water valve open until the N$.$C$.$ high level water sensor I:$1/11\backslash (=0\backslash ).$

d$.$ To start the motor and the washing cycle, activate the output $\backslash (\backslash$mathrm$\{$O$\}$: $2/2\backslash ).$ It is required that the door is closed $(\backslash (\backslash$mathrm$\{$I$\}$: $1/3=1\backslash )).$ If the door is opened, the motor $(\backslash (\backslash$mathrm$\{$O$\}$: $2/2\backslash ))$ stops temporarily until the door is close.

e$.$ After $25$ seconds, the washing cycle ends.

f$.$ Then activate the output O:$2/4$ to open the water outlet valve, maintain the motor O:$2/2"$ON$".$

g$.$ Stop all the outputs when no water is detected $\backslash ((\backslash$mathrm$\{$I$\}$: $1/10=0)\backslash ),$ meaning turn OFF the indicating light, stop the motor $\backslash (\backslash$mathrm$\{$O$\}$: $2/2\backslash )$ and close the water outlet valve $($O:$2/4).$

In your design take any other issues into considerations, like safety, etc.

Requirements:

Design a PLC based system to control the automatic machine and perform the task described above. Detail of the design will be specified on the lab.