SA0073: Uses of inadequate counter variable

Detects the use of non-temporary variables in ‎FOR‎ loops.

Justification: This is a performance warning. A counter variable is always initialized each time a POU is called. You can create this variable as a temporary variable (‎VAR_TEMP‎). Access to it may be faster and the variable does not take up any permanent memory.

Importance: Medium

PLCopen rule: CP21 / L13

Example

PROGRAM PLC_PRG
VAR
	nIndex : INT;
	iVar : INT;
END_VAR
FOR nIndex := INT#0 TO INT#20 BY INT#1 DO
	iVar := iVar + nIndex;
END_FOR

--> SA0073: Inadequate counter variable