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SA0166: Max. number of input/output/in-out variables...

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 124. 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

Output in the Messages view:

  • sa_icon_message.png SA0166: Too many VAR_IN_OUT variables in POU 'FB1'



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