Detects whether or not a defined number of input variables (VAR_INPUT), output variables (VAR_OUTPUT) or VAR_IN_OUT variables is exceeded in a POU. In the “Project Settings”, double-click the rule entry to open a dialog where you define the maximum number.
Justification: This is about checking individual programming guidelines. Many programming guidelines provide for a maximum number of POU parameters. Too many parameters make the code unreadable and the POUs difficult to test.
Importance: Medium
PLCopen rule: CP23
Example
In the project settings, for Rule 166, you have defined a maximum number of 1 for VAR_IN_OUT variables.
FUNCTION_BLOCK FB1 VAR_INPUT xIn : BOOL; END_VAR VAR_IN_OUT xInOut1 : BOOL; xInOut2 : BOOL; END_VAR --> SA0166: Too many VAR_IN_OUT variables in POU 'FB1'