Book Contents

Options on the General tab of the Trend Object Properties dialog box

The following table shows the options on the General tab of the Trend Object Properties dialog box.

Options

Descriptions

Chart style

Specify the plotting style of the chart. A trend either plot values against time (Standard) or against a selected pen (XY plot).

Standard

Select this option to plot each pen against time in a standard line chart.

XY plot

Select this option to plot each pen against a selected pen, which serves as the X-axis.

If you select this option, select a pen for the X-axis from the X-Axis pen box.

X-Axis pen

Specify which pen serves as the X-Axis in an X-Y plot.

Chart update mode

Specify how often the chart updates with new data.

Automatic

Select this option when you want the trend to update itself at regular time intervals.

Refresh Rate

In the Automatic mode, the Refresh Rate controls how often the trend acquires data.

The Refresh Rate range is 50 milliseconds - 596 hours.

On Change

Select this option when you want the trend to update itself as data values change.

This mode is useful for data that changes rapidly.

In the On Change mode, real-time data updates in the trend whenever data changes by more than a certain amount, or after a specified interval.

Heartbeat

Specify the maximum amount of time in milliseconds between updates when a chart is updating on change. If the value of a pen has not changed within the amount of time specified, the chart shows the current value.

Set the heartbeat rate to 0 to disable the heartbeat.

Deadband

Specify a percentage, from 0% to 100% of the actual value, by which a value must change before the chart shows the next value.

See also

Create a trend

Set up how the trend looks