Codesys 3.5, FB, Input and Output

[leon78]

Hello!
I have a FB with inputs, outputs and inputs-outputs.
The build finishes with error, if one of input-output isn't connected.
I need an extra warning, if one of inputs or outputs isn't connected.
How I can turn this warning on?

 

[ndzied1]

You have found the method to find missing connections. Do a build and it will complain.

Or maybe you want to know how to not have to put a value at some of the points on the function block. In that case, you right click on the function block call and select
Remove unused FB call parameters.

It will remove them from the screen and prevent the error from being generated. If they are required parameters then they will have to have default values or you will have to enter them elsewhere.

You can bring back the graphics for all FB parameters by right clicking on the function block again and selecting

Update Parameters.

All parameters will be shown again with question marks on the ones without connected tags.

 

[paraffin power]

{attribute 'reflection'}
FUNCTION_BLOCK POU
VAR_INPUT
	In1: BOOL;
END_VAR
VAR_OUTPUT
END_VAR
VAR
	{attribute 'is_connected' := 'In1'}
	in1ConnectionInfo: BOOL;
END_VAR

This may help. The attribute 'is_connected' recognises if 'In1' is assigned (and sets 'in1ConnectionInfo')

To create a user compile error, you can just:
{error 'this is an error'}

but I can't see how to make it conditional. I'd be keen to see if you get an answer.

 

[leon78]

I want to have the error in this case:
Compiler Error C0040
Message: Function ‘<function name>’ requires exactly ‘<number of inputs>’ input