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Password keypad in Citect Scada/FX3U PLC

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I am building an storage's safe for my final school project and I want to put an keypad on there so there can be put in an different password for every box that gets put in the safe.
when you want to put an box in, there needs to appear an screen where you can put in an password this password must be linked to this specific box so that when you want to pick it up you just put in your password on the keypad and get your own box back.

some requirements school gave me where that I would use Citect Scada And an Mitsubishi FX3U PLC
The password must exist out of 4 numbers of which 1 number gets randomly generated so there can never be an same password.


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