Hi everybody,

I declare the following enumeration:

{attribute 'strict'}
TYPE myEnum :
(
   red, yellow, green
);
END_TYPE

Does anybode know the exact function of the Strict attribute?

And why does this code not compile:

PROGRAM myPOU
VAR
   x:BOOL;
   e:myEnum;
END_VAR
e := SEL(x, myEnum.green, myEnum.red);

I get this error:
C0358: 'SEL(x, myEnum.green, myEnum.red)' is not a valid value for strict ENUM type 'myEnum'
When I remove the 'strict' attribute, the code compiles normally.
Any ideas? Thanks!

You could try using the instance name

Zitat:
e := SEL(x, e.green, e.red);

Bump

Was does {attribute 'strict'} do and can it be used outisde enums?

See the CODESYS Help:

NOTICE!
As of CODESYS V3.5 SP7, each enumeration that you add to a project receives the 'strict' attribute automatically in the line above the TYPE declaration. For compiler versions >=3.5.7.0 , this causes compile errors in the following cases:

Arithmetic operation with variables of the enumeration type
Assignment of a constant value to a variable of the enumeration type, in which the constant does not correspond to an enumeration value
Assignment of a non-constant value to a variable of the enumeration type, in which the non-constant has another data type than the enumeration type
The attribute can also be added explicitly or removed.

Syntax: {attribute 'strict'}