Use FB and$/$or FC$$s for the main part of your program. Use the methods mentioned in the exercise sessions for

programming with FB$$s or FC$$s: SHL

Use as little memory as possible $($memory$($words$),$ statics, timers, counters,...$)$

Test each part, a program that doesn$$t work will not give you a lot of points!

Palindrome

We design an access control that receives a $16$ bit code from a barcode reader $($enter with HMI, put data type in

binary$).$ This barcode reader also gives us a short "read" signal at each new pass $($simulate this signal$).$ We check

whether this $16-$bit code is a palindrome, so identical when read from left to right or right to left, for example LEVEL.

$1.$ If the code is a palindrome, we open the door $($we activate an output for $3$ seconds$).$

$2.$ If one wants to smuggle someone in$,$ one will probably scan the same pass twice $(16$bits are identical$).$ Give

a $10"$ silent alarm $($a separate output$)$ when this happens, but let the person in$.$

$3.$ In a shift, there are at least $5$ different badges $($the codes are not fixed, they only should be a palindrome$).$

Make sure that if you try the same card twice in a shift, the silent alarm goes off. Only the passes that lead

to access are stored, not the rejected ones. Add a reset button to start a new shift.

$4.$ The amount of badges is variable and can be chosen on the HMI $($maximum $8).$ When this amount is

reached, a new shift will start automatically