问php函数在前7次运行后不能正常工作

EN

public function SageData() {
    $this->Arr = array();
    $conn = odbc_connect('Data hub', '', '');
    if (!$conn) {
        exit("Connection Failed: " . $conn);
    }
    $sql = "SELECT [SHOP FLOOR PRODUCTION PLAN].[MACHINE], [SHOP FLOOR PRODUCTION PLAN].[cycletime]
    FROM [SHOP FLOOR PRODUCTION PLAN]
     WHERE ((([SHOP FLOOR PRODUCTION PLAN].[MACHINE])='$this->name'));

";

    $rs = odbc_exec($conn, $sql);
    if (!$rs) {
        exit("Error in SQL");
    }

    while (odbc_fetch_row($rs)) {

        $this->Cycletime = odbc_result($rs, "cycletime");
    }

    odbc_close($conn);
    return round($this->Cycletime, 2);
}

Machinecycle("ZW01001", "ZW01001Percent", 0);
Machinecycle("ZW01004", "ZW01004Percent", 1);
Machinecycle("ZW01005", "ZW01005Percent", 2);

public function GetM() {

    $q = $this->Cycle();
    $qq = $this->SageData();

    $this->M = $q - $qq;
  //  $this->P = $this->M / $this->sageData();

    if ($qq == 0) {
        $this->P = 0;
    } else {
        $this->P = $this->M / $this->sageData();
    }

    return round($this->P, 2);
}

Notice: Undefined property: machine::$Cycletime in C:\Somepath\Datatest.php on line 104

    return round($this->Cycletime, 2);