Question: Door Security System A simple security system for two doors consists of a card reader and a keypad ( Fig . 1 ) . A
Door Security System
A simple security system for two doors consists of a card reader and a keypad Fig A person may open a particular door if he or she has a card containing the corresponding code and enters an authorized keypad code for that card. The outputs from the card reader are as follows:
tableABNo card inserted,Valid code for door Valid code for door Invalid card code,
To unlock a door, a person must hold down the proper keys on the keypad and then insert the card in the reader. The authorized keypad codes for door are and and the authorized keypad codes for door are and If the card has an invalid code or if the wrong keypad code is entered, the alarm will ring indefinitely with a duty cycle a complete cycle having a time period of seconds when the card is inserted. If the correct keypad code is entered, the corresponding door will be unlocked for seconds when the card is inserted. Any of the doors can only be accessed times in mins. The door should not be unlocked further during the remaining of those mins if they have been accessed times. After mins, the doors can be accessed again for times for the next mins This process repeats itself indefinitely.
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Design, document, debug and simulate the ladder logic diagram for the above security system in LogixPro simulator. Consider the inputs as toggle switches.
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