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评估程序代码中的报警信息

报警表 可视化元素可以在运行时将可视化信息写入应用程序变量。此变量可以通过编程方式进行评估。

您可以从结构中获取有关报警的信息(例如:报警组、报警 ID、状态转换的时间戳、锁存变量、消息文本) AlarmSelectionInfoVisuElemsAlarm 图书馆)。

为了做到这一点,在 选择用于表示所选警报信息的变量 报警表的属性,指定一个类型的变量 AlarmSelectionInfo.然后在应用程序中使用该变量,如下所示:

  1. 添加新的 PRG_VISU 頁面。

  2. 添加 PRG_VISU POU 至 VISU_TASK

  3. 打开 PRG_VISU 在编辑器中打开 POU,并插入以下程序行。

    宣言

    PROGRAM PRG_VISU
    VAR
        alarmSelectionInfoDefault : AlarmSelectionInfoDefault;
        sLastTimestampDate : STRING;
        sLastTimestampTime : STRING;
        sLatch1 : STRING;
        sLatch2 : STRING;
        wsMessage1 : WSTRING := "No selection";
        wsMessage2 : WSTRING := "No selection";
        pInt : POINTER TO INT;
        xInit: BOOL := TRUE;
        pString : POINTER TO STRING;
        cbsFormattedValueLatch1 : CharBufferString(uiBufferSize := 0, stringType := TYPE_CLASS.TYPE_STRING);
        cbsFormattedValueLatch2 : CharBufferString(uiBufferSize := 0, stringType := TYPE_CLASS.TYPE_STRING);
        abyLocalBufferLatch1 : ARRAY[0..LENGTH] OF BYTE;
        abyLocalBufferLatch2 : ARRAY[0..LENGTH] OF BYTE;
        iPrevSelectionChangedCounter: INT;
        END_VAR
    VAR CONSTANT
        // The length of the string of the local CharBufferString instance
        LENGTH : INT := 80 * 2;
    END_VAR                        

    执行

    IF xInit THEN
        cbsFormattedValueLatch1.Init(pBuffer:=ADR(abyLocalBufferLatch1), uiBufferSize:=INT_TO_UINT(LENGTH + 1), stringType:=TYPE_CLASS.TYPE_STRING);
        cbsFormattedValueLatch2.Init(pBuffer:=ADR(abyLocalBufferLatch2), uiBufferSize:=INT_TO_UINT(LENGTH + 1), stringType:=TYPE_CLASS.TYPE_STRING);
        xInit := FALSE;
    END_IF
    IF alarmSelectionInfoDefault.AlarmSelectionInfo.iSelectionChangedCounter <> iPrevSelectionChangedCounter THEN
        // Format Date/Time as string
        sLastTimestampDate := AlarmManager.FormatDate(alarmSelectionInfoDefault.AlarmSelectionInfo.timeStampLast, AlarmManager.AlarmGlobals.g_sDateFormat);
        sLastTimestampTime := AlarmManager.FormatTime(alarmSelectionInfoDefault.AlarmSelectionInfo.timeStampLast, AlarmManager.AlarmGlobals.g_sTimeFormat);
        // Retrieve latch variables as string
        cbsFormattedValueLatch1.FromString('');
        pString := FormatTypedValue(alarmSelectionInfoDefault.AlarmSelectionInfo.paLatchVariables^[0], cbsFormattedValueLatch1);
        STU.StrCpyA(ADR(sLatch1), SIZEOF(sLatch1), pString);
        cbsFormattedValueLatch2.FromString('');
        pString := FormatTypedValue(alarmSelectionInfoDefault.AlarmSelectionInfo.paLatchVariables^[1], cbsFormattedValueLatch2);
        STU.StrCpyA(ADR(sLatch2), SIZEOF(sLatch2), pString);
        // Retrieve messages
        STU.StrCpyW(ADR(wsMessage1), SIZEOF(wsMessage1), alarmSelectionInfoDefault.AlarmSelectionInfo.papwsAlarmMessages^[0]);
        STU.StrCpyW(ADR(wsMessage2), SIZEOF(wsMessage2), alarmSelectionInfoDefault.AlarmSelectionInfo.papwsAlarmMessages^[1]);
        iPrevSelectionChangedCounter := alarmSelectionInfoDefault.AlarmSelectionInfo.iSelectionChangedCounter;
    END_IF