What's the difference between a byte and a word?

Older PLCs used 8 bit words, there are still alot of these out there. Sometimes a floating point number is refered to as a word, a convenient but inaccurate nomenclature. A byte is normaly 8 bits, a word 16 bits and a double word 32 bits. Depending on the make and model of the PLC (or other computer), a word is 2, 4 or 8 bytes.
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