NT21_Reference Manual (V069-E1-1) (986756), страница 38
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In this case, the graph won’t be refreshed even if the values displayedon the graph are changed.Reference:S The graph’s % values are always displayed with the standard display attributes. These display attributes cannot be changed.LoggingData LoggingWhether or not the logging function is used (Data loggingfunction and background function, page 177)Check mark (logging function used)/No check mark (logging function not used)Background Whether or not the background function is used (Data logging*2function and background function, page 177)Check mark (background function used)/No check mark (background function not used)Forward*2Presence/absence of a touch switch to proceed to the nextpageCheck mark (touch switch set)/No check mark (touch switch not set)Rewind*2Presence/absence of a touch switch to return to the previouspageCheck mark (touch switch set)/No check mark (touch switch not set)Clear Log*2Presence/absence of a touch switch to clear the logging dataCheck mark (touch switch set)/No check mark (touch switch not set)Touch Switches for Display FunctionStopPresence/absence of a touch switch to stop data samplingCheck mark (touch switch set)/No check mark (touch switch not set)ClearDisplayPresence/absence of a touch switch to clear the trend graphdisplayCheck mark (touch switch set)/No check mark (touch switch not set)ContinuePresence/absence of a touch switch to restart data samplingCheck mark (touch switch set)/No check mark (touch switch not set)The line thickness for trend graphs is fixed as 1 dot.173Section 2-10GraphsReference:S If a small value is set for Interval Type, even if broken line, 1-dot chain line, or2-dot chain line is specified the line will appear to be a solid line.S In the case of a standard trend graph that determines the 100%, 0% and–100% values according to the Table Entry settings, if the contents of the referenced numeral memory table entries change, the graph becomes discontinuous.Example:Contents of the numeralmemory table entryreferenced to find the100% value changed partway through graph display100%0%Resulting DisplayWhen No Check Mark Is Set for display SignPosition(Top left corner of the rectangular area includingthe graph, percentage display, and touch switches)Frame colorLatest data80%100% positionLatest data–120%Display color for the + rangeSize(Y direction)Line (color, style)Line (color, style)0% positionSize (X direction)When a Check Mark Is Set for Display SignIn this case, the center of the graph is always the 0% position, regardless of thesettings made for 100%, 0%, and –100%.Position(Top left corner of the rectangular area includingthe graph, percentage display, and touch switches)Frame colorSize (X direction)100% positionDisplay color of + rangeLine (color, type)0% positionSize(Y direction)Line (color, type)Display color of – range–100% positionLatest data –50%Latest data 80%174Section 2-10GraphsDrawing WidthThe drawing width is the interval at which successive data are drawn in the direction of motion.
If a value outside the display area of the graph is specified, thegraph will not be displayed.Drawing widthDirection of motion→Line Drawing MethodThe graph is drawn as shown below depending on the settings made for Typeand Direction.The 100% value is at the top of the frame when the Direction is a lateral one andthe right of the frame when the Direction is a longitudinal one.When Standard Is Set for TypeWith the standard type, the latest drawing position moves in the direction of motion specified by Direction with the passage of time.
If the direction of motion isright, the display changes as indicated below. When the line reaches the edge ofthe graph area, the line is cleared and then displayed again from the beginning.Direction ofmotion →f: Latest dataTo start, the PTdraws a linefrom 0 to thelatest data.f: Latest dataf: Latest dataf: Latest dataf: Latest dataThereafter, thePT draws a linefrom the lastdata to the latestdata.The drawing results with each Direction setting are indicated below.Up:The drawing positionmoves upward.Direction of motionDown:The drawing positionmoves downward.Direction of motion100%Left:The drawing positionmoves to the left.100%Direction of motion100%Right:The drawing positionmoves to the right.100%Direction of motion175Section 2-10GraphsWhen Pen Recorder Is Set for TypeWith the pen recorder type, the latest drawing position is always displayed at theedge of the graph area.
As time passes, the part of the graph that is already displayed moves in the direction specified by Direction (as if paper were movingunderneath a pen). When the direction of motion is right, the display changes inthe manner shown below. When the line reaches the edge of the graph area, thedata is cleared from the oldest first.Direction ofmotion →f: Latest dataTo start, the PTdraws a linefrom 0 to thelatest data.f: Latest dataf: Latest dataf: Latest dataf: Latest dataThe data isprogressivelycleared, oldestfirst.The drawing results with each Direction setting are indicated below.Down:The drawn line movesdownward.Up:The drawn line movesupward.Direction of motionDirection of motion100%Left:The drawn line movesto the left.100%Right:The drawn line movesto the right.100%100%Direction of motionDirection of motionMethod for Calculating the Percentage ValueThe percentage value is calculated as follows, depending on whether it is largeror smaller than the 0% value.• When displayed numeric value y 0%, or when a check mark is set for Display Sign:Percentage value =Displayed numeric value – [0%][100%] – [0%]100• When displayed numeric value < 0%:Percentage value =Displayed numeric value – [0%][0%] – [–100%]100Method for Displaying the Percentage ValueThe percentage value will be displayed as a signed value regardless of the trendgraph’s Display Sign setting.
The percentage value is always displayed as 5-digit value: the sign character, 3-digit numerical value, and % character. (The signcharacter is a blank space for positive values.)Differences in Trend Graph Display Method According to Percentage ValuesThe display method of a trend graph differs according to the percentage valuerange.176Section 2-10Graphs1, 2, 3...1. When the percentage value is negativeThe following happens, depending on the setting for Display Sign:• No check mark: The graph line is displayed as 0% (Display % is shown innegative value).• Check mark:Displayed in the minus range2. When the absolute value of the percentage value is in the range of 100% to999%If the percentage value enters the range 100 to 999% or –100 to –999%, andthe line projects out of the graph area, only the part of the line inside thegraph area is displayed.If a check mark is set for Display %, the calculated percentage value is displayed.100%0%Latest data50%Latest data–300%–100%3.
When the absolute value of the percentage value is greater than 1000%If the percentage value exceeds 1000% or enters the range below –1000%and the line projects out of the graph area, only the part of the line inside thegraph area is displayed, as in (2) above.If a check mark is set for Display %, the percentage value is displayed asfollows:• ∗∗∗∗%Data Logging Function and Background FunctionThe data logging function is a function for recording (logging) the displayed values internally.Normally, the data sampled for a trend graph is not recorded internally, but byusing the data logging function it is possible to back track and display past data.With the PT, the data logging function can be used for the data of up to 8 lines.The maximum data quantity that can be recorded for each is 1440 points, andwhen this limit is exceeded the data is deleted from the oldest points.If the Clear Log touch switch has been set, the data can be cleared at any time.The background function allows data to be sampled even while the trend graphis not displayed.Usually, with trend graphs, data is only sampled while the graph is displayed andsampling is stopped when the screen is switched.
By using the background function, sampling can be carried out even while the trend graph is not being displayed. The recorded data is displayed by back tracking when the trend graph isdisplayed.The background function can only be used in conjunction with the data loggingfunction, and the only data recorded is that for the data logging function. However, since sampling continues while the background function is being used, theprocessing of the PT may be delayed.177Section 2-10GraphsReference: The retention of data by the data logging function remains effective until any ofthe following operations is performed.S The power to the PT is turned OFF.S The PT is reset.S All the screen data is transmitted.S Data is transmitted in screen units.When operation is stopped, for example by displaying the System Menu, sampling is also stopped even if the background function is being used; it is restartedwhen operation is restarted (the data is retained and recording starts from thedata following the last data).Data is recorded as described below depending on whether or not the data logging function and background function are used.
The PT will start drawing thetrend graph again when it is switched to a screen containing the trend graph fromanother screen, so use a touch switch that controls the trend graph if you want todisplay the previous data.When Neither the Data Logging Function or Background Function Is UsedScreenswitchingReturnOther screenTrend graph screenTrend graph screen(trend graph drawing restarts)Data logging not performedWhen the Data Logging Function Is Used and the Background Function IsNot UsedScreenswitchingTrend graph screenData loggingperformedReturnOther screenTrend graph screenData loggingperformedNo data logging during thisperiodWhen Both the Data Logging Function and the Background Function AreUsedScreenswitchingTrend graph screenReturnOther screenTrend graph screenData logging performed continually178Section 2-10GraphsControls on Display According to Touch SwitchesTrend graphs can be displayed in the form shown below, with associated touchswitches to control operations.These dedicated touch switches can be used for data sampling and display operations.The relevant functions are performed once only when the touch switches arepressed.
These functions cannot be controlled from the host.The positions of these touch switches can be set freely on the screen. However,the display colors, sizes and the marks cannot be changed.Stop touch switchStops data sampling. Updating of the trend graph display is stopped at thesame time.While sampling is stopped, the stop touch switch is lit.When the background function is used, pressing the stop touch switch stopssampling in the background.When the last data recorded before sampling was stopped is displayed, it isdisplayed following the currently displayed graph.After pressing the(stop) touch switch, if the(previous page (rewind))touch switch is pressed to return to a past display and then the(restart(continue)) touch switch is pressed to restart sampling, past data will not bedisplayed and the display of new data will start again.Example:DSPCLRLOGCLRRestart (continue) touch switchRestarts the sampling of data stopped by pressing the stop touch switch.Updating of the trend graph display is started at the same time.During sampling, the restart (continue) touch switch is lit.Display clear (clear display) touch switchClears the trend graph display.
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