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I/O address

Hi, Recently i have came across a Scada software and it inside the blocks they have these I/O addresses....like D50:20 i was told these are in bits...and they only allowed 8 bits for the last 2 digit....but i really dont understand all the bits stuff...any tutorial or any1 can explain the bits and calculation stuff...
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jaxrpc
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jaxrpc
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nayernaguibCommented:
This tutorial on binary number system should be fine:

  http://www.math.grin.edu/~rebelsky/Courses/152/97F/Readings/student-binary.html

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  Nayer Naguib
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nayernaguibCommented:
The following two pages describe both binary and hexadecimal number systems (you will also need to know about hexadecimal representation):

  http://www.lyzrdstomp.com/binary/binprime.html
  http://www.lyzrdstomp.com/binary/hex1.html

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  Nayer Naguib
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