Hint #1 - Start with the first PAT code on the side of the machine. PAT will now give you a clue on how to solve this puzzle. Also make a note that each moves at a constant speed, that'll be important in the next puzzle.

PAT says each machine will give you a set of numbers, followed by two digits. The first represents the number of digits that are correct, the second represents the number of digits in the right order. Start scanning each bot to build up your numbers.

Hint #2 - Once scanned you should end up with these numbers

4509-3-2
9435-4-0
4095-3-1
6739-2-1

 

Based on the logic PAT has shared, line 9435-4-0 indicates that all four digits are correct, but in the wrong order. We can use this to figure out the correct order.

Hint #3 - The bottom line suggest for 6739-2-1 we have two correct numbers (3 and 9) and only one is in the right place. We KNOW that 3 cannot be in the right place because it is in the same position as in line 9435-4-0. And we know the 3 in that line is incorrectly placed. Therefore it must be the 9 that is in the correct place. So we know have: XXX9 . Can we figure out what order 345 go in?

Hint #4 - If 9 is correct then we know that leaves 1 digit in line 1 that's in the right place. This must be 4 or 5. For line 3 we have only one digit in the right place. We know this can't be 9 so it must be a known digit in the same place as line #1. THerefore 4 is in the correct position meaning we now have 4XX9.

Hint #5 - Line 1 has 3 correct digits. We know 4 and 9 are in the right place, but 5 is not. Therefore 5 must be in position 3. So 4X59.

Solution - 4359