Number values can appear as binary numbers, octal numbers, decimal numbers and hexadecimal numbers. If an integer value is not a decimal number, you must write its base followed by the number sign (#) in front of the integer constant. The values for the numbers 10-15 in hexadecimal numbers will be represented as always by the letters A-F.

You may include the underscore character within the number.

These number values can be from the variable types BYTE, WORD, DWORD, SINT, USINT, INT, UINT, DINT, UDINT, REAL or LREAL. Implicit conversions from "larger" to "smaller" variable types are not permitted. This means that a DINT variable cannot simply be used as an INT variable. You must use the type conversion.