Configuration - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

6.1

Configuration

Programs written in ST language consist of operators and control statements.
Each statement must end with a semicolon ";".
Spaces, tabs, and line feeds can be inserted between an operator and data.
Comments can be inserted into a program. Enclose a comment statement with "(*" and "*)".
Program components
An ST program consists of the following components.
Item
Delimiter
Operator
Reserved word Control statement
Device
Data type
Standard function
Constant
Label
Comment
Other symbols
• Write delimiters, operators, and reserved words in one-byte characters.
• For details on the reserved words, refer to the following.
 GX Works3 Operating Manual
6 STRUCTURED TEXT LANGUAGE
60
6.1 Configuration
End of the statement
Space
Tab
Linefeed
Comment
Example
;, (,)
+, -, <, >, =
IF, CASE, WHILE, RETURN
X0, Y10, M100, ZR0
BOOL, DWORD
ADD, REAL_TO_STRING_E
123, "abc"
Switch_A
(*Turn on.*)
One-byte space, line feed code, TAB code
Assignment statement
Select statement
Function call statement
Function block call statement
Reference
Page 61 Delimiters
Page 61 Operators
Page 62 Control statements
 MELSEC iQ-R CPU Module User's Manual (Application)
Page 40 Data Types
 MELSEC iQ-R Programming Manual (Instructions,
Standard Functions/Function Blocks)
Page 71 Constants
Page 72 Labels and devices
Page 74 Comments
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