Chapter 4 Variable
4-7
[Description of Dialog Box]
a. Variable kind: VAR_GLOBAL and VAR_GLOBAL_CONSTANT 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 same name with a direct variable is unavailable (i.e. MX0, WB0,…)
- If a line is empty, BOOL is displayed as the default type when entering a variable.
c. Type: 23 types are available; 20 basic types and 3 induced types.
- Basic type (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 type (3): 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 not available in STRUCT, FB_INST (i.e. FB
name display)
d. Memory address: enters it by using direct variable (I, Q, M, R, W).
e. Initial value: default value can be set.
f. Retain: if memory address is set, retain column is inactive.
- R, W: always retain area.
- M: check it by obtaining basic parameter information.
- I, Q: always not retain area.
g. Used: display whether to use a declared variable.
h. Comment: every character is available.
- Multi line entry is available by using Ctrl + Enter key.
i. Line validity: To register on global variable window, it needs variable type, variable and type.
- If not registered on global variable, it is displayed 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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