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{attribute 'hide'}
METHOD Diag : STRING
VAR
    LogClass : UDINT;
// Device Diagnose
LogClass := CmpLog.LogClass.LOG_INFO;
IF WLEN( _cDeviceName ) <= 0 THEN
    Diag := 'DEVICE';
ELSE
    Diag := TO_STRING( _cDeviceName );
END_IF
IF PluggedIntoEoN THEN
    Diag := CONCAT( Diag, '.PLUGGED' );
    Diag := CONCAT( Diag,  '.UNPLUGGED' );
IF SessionState = SparkplugSessionStateType.ONLINE THEN
    Diag := CONCAT( Diag, '.ONLINE' );
END_IF;
IF SessionState = SparkplugSessionStateType.OFFLINE THEN
    Diag := CONCAT( Diag, '.OFFLINE' );
// log on change
IF Diag <> _Diag THEN
    WriteDeviceLog( gc_sparkplug.CMP_EDGE,
                    LogClass,
                    '%s',
                    Diag );
// store 
_Diag := Diag;