Hex (Hexadecimal) - Mitsubishi Electric A800 Programming Manual

Values that can be used in sequence programs
3.8.2

HEX (hexadecimal)

HEX
HEX represents four bits of binary data with one digit.
BIN uses 4 bits to represent the 16 values from 0 to 15.
HEX uses the letter A to represent the bit next to 9 (10) and B to represent 11, and then a carry occurs after F (15).
For the numeric representations of BIN, HEX, and DEC, refer to
Numeric representation in HEX
Each register (such as a data register) used for the PLC function consists of 16 bits.
Therefore, the value that can be stored in each register can be represented in the range from 0 to HFFFF in HEX.
84
Sequence program
page 82.