Precautions On Assigning A Name - Mitsubishi MELSEC-Q Series Programming Manual

4.8

Precautions on Assigning a Name

This section explains the conditions for assigning a name to a label, function block instance or
structure label.
• Conditions
(1) Specify a name within 32 characters.
(2) Do not use reserved words.
For reserved words, refer to the following section.
(3) Use alphanumeric and underscores (_).
(4) Do not use an underscore at the end of the name.
Do not use two or more underscores in succession.
(5) Do not use spaces.
(6) Do not use a number for the initial character.
(7) Constants cannot be used.
(An identifier that begins with 'H' or 'h' and an expression where a hexadecimal (0 to F)
immediately follows 'H' or 'h' (maximum 9 digits including 'H' or 'h' (excluding 0 that
immediately follows 'H' or 'h')) are also treated as a constant. (Example: 'hab0'))
(8) Elementary data type names cannot be used.
(9) Function/FB names cannot be used.

4.8 Precautions on Assigning a Name

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Appendix 2 Character Strings that cannot be Used in Label Names and Data Names