How Do I Indicate A Constant Value In A Command?
A PLC can have hexadecimal numbers and numbers with BCD (decimal) crossing.
A "#" next to a figure indicates that it is a hexadecimal number and a "&" is a BCD number.
It should be noted that a constant value prefixed with &, is put as a HEX value in the PLC.
For example, if & 10 is in the command, then put in the HEX A number at that address. If we literally put the number 10 in the contact to continue and it is a decimal number, then we put # 10 in the command itself as a programmer and remember that this is a decimal number and not a HEX number. Link: 
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