public function addHistoryValue($_value, $_datetime = '')
{
if ($_value === null || $_value !== '' && $this->getIsHistorized() == 1 && $this->getType() == 'info' && $_value <= $this->getConfiguration('maxValue', $_value) && $_value >= $this->getConfiguration('minValue', $_value)) {
$hitory = new history();
$hitory->setCmd_id($this->getId());
$hitory->setValue($_value);
$hitory->setDatetime($_datetime);
return $hitory->save($this);
}
}