NT21_Reference Manual (V069-E1-1) (986756), страница 39
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The logging data is not cleared but retained.Log clear (clear log) touch switchClears the currently displayed trend graph and that trend graph’s loggingdata. Other trend graphs will not be cleared. This touch switch is only effective when using the data logging function.Previous page (rewind) touch switchDisplays logging data older than that of the currently displayed trend graph.This touch switch is only effective when using the data logging function.179Section 2-10GraphsWith a standard type trend graph, if this touch switch is pressed during display of the latest data to backtrack to past data, and then the next page (forward) touch switch is pressed to return to display of the latest data, the latestdata is plotted following the past data.Example:Next page (forward) touch switchDisplays logging data newer than that of the currently displayed trend graph.This touch switch is only effective when using the data logging function.When the latest data is displayed during data logging, updating of the trendgraph display is automatically restarted.The previous page (rewind) or next page (forward) touch switch, whichever waspressed last, remains lit.Display Direction of Previous/Next Page Touch SwitchThe display direction of previous/next page when Right is set for Direction isshown below.Type: Standard1 page of displayOldestPrevious page(rewind)Next page(forward)LatestType: Pen Recorder1 page of displayLatestNext page(forward)Previous page(rewind)OldestWhen the Display Is Wound from Old Dot to the Latest.When the page is wound to the latest display after displaying the old data, display is shown as follows:Standard Type1 page of displayLatest data180DisplayLatest dataSection 2-10GraphsPen Record TypeWith the pen recorder type, the latest drawing position is always displayed at theedge of the graph area.
Therefore, depending on the number of data in the latestpage, old data may be displayed discontinuously as shown below (Internally, thedata is recorded continuously.)1 page of displayLatest dataDisplayLatest dataDisplay FunctionsFor trend graphs, the graph area is displayed in accordance with the Generalsettings, and the broken line is displayed in accordance with the Settings (properties of each line) settings.For details on the method of display depending on the General and Settings(properties of each line) settings, refer to Common Attributes (page 171).• When multiple broken lines are registered, they overwrite each other in the order they were registered.
When broken lines overlay each other they are displayed according to the XOR principle (page 47), and consequently the linestyle and color may differ from those specified. The same principle applieswhen a broken line overlays the graph frame.Input FunctionsTrend graphs have no input function.Output FunctionsTrend graphs have no output function.Processing FunctionsTrend graphs calculate the percentage value in accordance with the settingsmade for Settings (properties of each line).For details on the calculation method depending on the Settings (properties ofeach line) settings, refer to Common Attributes (page 171).Relationship with Other Elements• For details on how numeric values are stored in numeral memory table entries,refer to 2-3-1 Numeral Memory Table (page 72).• Trend graphs overlap with other elements in accordance with the order inwhich they were registered for the screen with the Support Tool.
However, theway in which they overlap can be changed with the Support Tool.181Section 2-11Alarm List, Alarm History2-11 Alarm List, Alarm HistoryFunction OutlineAlarm ListThe PT can monitor the status of bits at the connected host designated in bitmemory table entries and, when the status of a particular bit changes to 1 (ON),display the corresponding message (from a character string memory tableentry) or image/library data. The element used to execute this function is calledan alarm list.Message set for bit memory table entry 14(character string memory table entry 32)Character stringmemory table entry 32Image/librarydata 113CCharacter string memory table entry 50Image/library data 1002No.
13Character string memory table entry 32Image/library data 113CNo. 14Character string memory table entry 54Image/library data 1125No. 15BitHost0 A0000001 L001003 ← 1 (ON)0 D010015When the message being displayed is pressed, the image/librarydata (113C) set for bit memory table entry 14 is displayed.Alarm HistoryThe PT can continually monitor bits at the host designated in bit memory tableentries, record the time when their status changes to 1 (ON), and the number oftimes they come ON, and display this information together with the corresponding message (from a character string memory table entry) for the bit. The element used to execute this function is called an alarm history.The alarm history record data is backed up by the built-in battery of the PT and istherefore retained even when the power to the PT is turned OFF or the PT is reset.
(An optional Battery is required for the NT21.)Message set for bit memory table entry 24(character string memory table entry 13)Record dataCharacter stringmemory table entry 13Character stringmemory table entry 12Image/librarydata 102BCharacter string memory table entry 11No. 22Image/library data 005FBit memory table 2497/12/04 11:19:20Character string memory table entry 12 No. 23Image/library data 102ABit memory table 2397/12/04 11:25:12Character string memory table entry 13Image/library data 102BNo. 24When the message being displayed is pressed, the image/librarydata set for bit memory table entry 13 (102B) is displayed.Reference: If the remaining capacity of the battery is insufficient, the alarm history data is allcleared when the power to the PT is turned OFF or the PT is reset.When low battery voltage is detected, replace the battery immediately.
Refer tosection 7 of the Setup Manual for details on replacing the battery.182Section 2-11Alarm List, Alarm HistoryDifferences Between Alarm List and Alarm HistoryThe alarm list and alarm history differ in the following respects.ItemAlarm ListAlarm HistoryDisplaymethodAs element onlyAs element, and as a screen displayed from theSystem MenuMonitoreddataHost bits allocated Host bits allocated to bit memory table entries forto bit memory table which History is set.entry within thedesignated rangeMonitortimingWhile the alarm listelement is displayed onlyContinuous monitoring regardless of the displayed screenRecording No recordingexecutedTime of occurrence is recorded.MessagecontentsWhen a messageis displayed for analarm list, the contents of the character stringmemory tableentry set for the bitmemory tableentry are read.- Occurrence order:When the status of a monitored bit at the hostchanges to 1 (ON), the contents of the character string memory table entry set for the bitmemory table entry are read.- Frequency order:When a message is displayed for an alarm history, the contents of the character stringmemory table entry set for the bit memory tableentry are read.Outputdata tothe Support ToolNot possible forthere is no recorddataPossible (occurrence order and frequency orderrecords transmitted simultaneously)DisplayorderAscending order ofbit memory tableentry numbersSelect either of the following:- Occurrence order:Chronological order in which the statuses of themonitored bits changed to 1 (ON) (displayedfrom the oldest record first or the newest recordfirst depending on the memory switch setting atthe PT)- Frequency order:Order based on the number of times the statusof each bit has changed to 1 (ON), from most toleast frequent.183Section 2-11Alarm List, Alarm HistoryOutline of Alarm List/Alarm History OperationsThe operations of the alarm list and alarm history are described below.Reference:S The alarm list only checks host bits allocated to bit memory table entries withinthe designated range.
This checking is performed only while the alarm list isdisplayed.The alarm history only checks host bits allocated to bit memory table entriesfor which History is set. The relevant host bits are checked continually. Consequently, if a large number of host bits is set the processing of the PT maybe delayed.S Alarm lists are displayed in ascending order of bit memory table entry numbersand alarm histories are displayed in frequency order or occurrence order.When an alarm history is displayed in occurrence order, the order can be specified as from the newest record or from the oldest record by setting the Hist.Disp.
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