MITSUBISHI ELECTRIC 700 Series - Manual (Page 79)

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Numerical Values Usable in Sequence Program
the range -32768 to 32767.
Therefore, each register of the built-in PLC function can store any value
between -32768 and 32767.
3.8.2 HEX (HEX Decimal)
(1) HEX
HEX represents four bits of BIN data as one digit.
Using four bits in BIN, you can represent 16 values from 0 to 15.
Since HEX represents any of 0 to 15 in a single digit, 9 is followed by alphabets A
(instead of 10), B (11)..., and F (15) is followed by a carry.
Refer to page 72 for the correspondences between BIN, HEX and decimal code.
(2) Numerical representation of HEX
Each register (e.g. data register) of the built-in PLC function consist of 16 bits.
Therefore, the value that can be stored into each register is represented as any of
0 to HFFFF in HEX.