Chapter 4 Variable
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a. Variable Kind: VAR, VAR_INPUT, VAR_OUTPUT, VAR_IN_OUT and VAR_RETURN are available.
b. Variable name: The declared variable can not be duplicated with the identical name.
- A figure is unavailable for the first character.
- A special character is unavailable. (However,‘_’ is available.)
- Space is not available as a character.
- A name same with direct variable can not be used as a name(i.e. MB4, W4, RW9,…)
- If a line is empty, BOOL is displayed as the default type when entering a variable.
c. Type: 22 types are available; 20 basic types and 3 induced types.
- Basic types(20): (BOOL, BYTE, WORD, DWORD, LWORD, SINT, INT, DINT, LINT, USINT, UINT, UDINT,
ULINT, REAL, LREAL, TIME, DATE, TIME_OF_DAY, DATE_AND_TIME, STRING)
- Induced types(2): ARRAY(i.e. ARRAY[0..6,0..2,0..4] OF BOOL) => factor limit (up to 3rd), STRUCT(i.e.
STRUCT name display) => STRUCT type is no available in STRCT
d. Used: it can not be declared as Read Only.
e. Comment: every character is available.
- Multi line entry is available by using Ctrl + Enter key.
f. Line validity: To register on FB variable window, it needs variable type, variable and type.
- If not registered on FB variable, it displays in pink.
Notes
- If any error occurs when editing a cell, it is displayed in pink.
- Press ESC key to recover the previous value during the cell edit.
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