Using Trend Graphs to View Historical Data

You can display a trend graph's past data that has been cleared from the trend graph. This function is useful for evaluating changes in the data over a time.

Example Operation

Setting Workflow

1. Set up Parts
2. Set up Scripts

Set up Parts

Project Explorer : [Screen Design] ➞ [Screens] ➞ [Screen1]

Drag and drop the following objects from the [Tool Chest] to the screen.

Trend Graph (Name: TrendGraph1) properties : A-1

Tab	Sub Tab	Property		Value
[Function]	[Basic]	[GroupName]		[LoggingGroup1]
		[Channels]		3
		[Channel 1]	[Variable]	[Variable] [Name]: Var1
			[Use Global Range]
			[Visibility]
			[Display Format]	[Line]
			[Mark]	[None]
		[Channel 2]	[Variable]	[Variable] [Name]: Var2
			[Use Global Range]
			[Visibility]
			[Display Format]	[Line]
			[Mark]	[None]
		[Channel 3]	[Variable]	[Variable] [Name]: Var3
			[Use Global Range]
			[Visibility]
			[Display Format]	[Line]
			[Mark]	[None]
		[Display Mode]		[Full]
		[Graph Type]		[Pen Recorder]
		[Min Global Range]		0
		[Max Global Range]		1000
		[Interval]		1
		[Unit]		Min
	[Detail]	[Display Cursor]
		[Display Cursor Labels]

 

Switch object (Name: Switch1) properties : B-1

Default Value

Switch object (Name: Switch2) properties : B-2

Default Value

Switch object (Name: Switch3) properties : B-3

Default Value

Set up Scripts

Project Explorer : [Screen1]

Set the following script on the object.

From the [Tool Chest] drag and drop the script to the Script editor.

Switch object (Name : Switch1) script : B-1 Mode Change

Switch object (Name : Switch2) script : B-2 Move Graph Plot to Past Time

Switch object (Name : Switch3) script : B-3 Move Graph Plot to New Time

Legend	Block
1	[Triggers] ➞ [Touch] ➞ [Touch]
2	[Values] ➞ [Screen Object]
3	[Operations] ➞ [Screen/GraphicObject] ➞ [Trend Graph]