====== Licensed Feature Check ======

===== Function Name =====

CheckProductFeatureLicense

===== Call in ST =====

<code st-iec>
program test
    var
        feature : string := "feature-oem-1";
        licenseResult : int;
    end_var
    
    (* 0 = licensed with a value, 31 = licensed without a value, 500 = not licensed *)
    (* the value associated with the key/flag cannot currently be retrieved *)
    
    licenseResult := CheckProductFeatureLicense(feature);
end_program
</code>

===== Description =====

The ''CheckProductFeatureLicense'' function can be used at runtime to determine whether the active license contains a specific key/flag. The result can then be used, for example, to control subsequent program execution. The key is actually represented by a key-value pair. Support for working with the "value" component is planned for the future.

===== Inputs =====

|Input |Type |Description |
|feature |string_ref |Text identifier of the key to be checked |

===== Outputs =====

|Output |Type |Description |
|=> |INT |0 - the key is present in the license and has an associated value, \\ 31 - the key is present in the license but has no associated value, \\ 500 - the key is not present in the license |