Compiler Error C0204

Message: Variables of type BIT must be declared within a VAR_INPUT-, VAR_OUTPUT or VAR-block

Possible error cause: An attempt is made to define a variable of type BIT or as a VAR_IN_OUT parameter.

Error correction: Define variables of type BIT only within a VAR_INPUT, VAR_OUTPUT or VAR block.

Example 430. Example of the error:

PROGRAM PLC_PRG
VAR
    inst : FB;
END_VAR


FUNCTION_BLOCK FB
VAR_IN_OUT
    b : BIT;
END_VAR

Message:

C0204: Variables of type BIT must be declared within a VAR_INPUT-, VAR_OUTPUT or VAR-block