Mitsubishi Electric MELSEC iQ-F Series - Constant

6 ST LANGUAGE
6.1 Configuration
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6
■When a master control instruction is used
Shown here is the operation when the master control is OFF.
• The statement in a selection statement (an IF statement or a CASE statement) or in a iteration statement (a FOR
statement, a WHILE statement, or a REPEAT statement) is not processed.
• Outside of a selection statement or a iteration statement, assignment statement is not processed and statement other than
assignment statement is not executed.
Ex.
A statement in a selection statement (IF statement)
Ex.
A statement out of a selection statement or a iteration statement (in the case of a bit assignment statement)
Ex.
A statement out of a selection statement or a iteration statement (in the case of an OUT instruction)
Constant
Methods for expressing constants
The following table shows the expression methods for setting a constant in a ST program.
For the expression methods other than the one described the above, refer to the following.
Page 40 Constant
Data type Expressing method Example
String(32) STRING Enclose character strings with single quotation ( ' ). Stest := 'ABC';
MC(M0,N1,M1); //Master control OFF
IF M2 THEN
M3:=M4; //
No processing is executed when the master control is OFF. So, M3 maintains the value at the time of a previous scan.
END_IF;
M20:=MCR(M0,N1);
MC(M0,N1,M1); //Master control OFF
M3:=M4; //
No processing is executed when the master control is OFF. So, M3 maintains the value at the time of a previous scan.
M20:=MCR(M0,N1);
MC(M0,N1,M1); //Master control OFF
OUT(M2,M3); //No execution is made when the master control is OFF.
M20:=MCR(M0,N1);