MAN0923_Issue 3_04/15
Touchpoint Pro
Operating Instructions
107
7. Normal Operation
7.9 View Trend Graph
The trend graph shows the history of the signal on an analogue input channel. The signal value is logged
when it changes, or every one hour if there is no change.
Note: Touchpoint Pro does not adjust automatically for daylight savings time. Be aware that if the date and
time are changed to a time in the past, (for example ending daylight savings time) Touchpoint Pro will retain
a backup of the previous data.
Note: Touchpoint Pro logs the trend data point when the system is in Field Inputs Test Mode, but does not
log it when in the Configuration Settings Test or Cause and Effect Test modes.
Note: The system logs when the value changes, with a resolution determined by the gas range of the
channel. For a gas range of less than 10, the resolution is 0.01, for a gas range of 10 to 99 the resolution is
0.1, and for a gas range of 100 or more, the resolution is 1.
1. From the
System Status
screen navigation bar, select the
Inputs
icon
2. A list of all input channels is shown in order of channel ID
3. Select the required channel, and select
Trend
Graph
from the popup menu
4. The trend graph will be displayed
5. Use the forward and backward arrows to scroll through the graph. Expand or reduce the axes using
the X+, X-, Y+ and Y- buttons
If there are more data points than the number of pixels available on the screen, Touchpoint Pro will by
default display the maximum value within each set of points. This is the MaxLine. (For example, if one pixel
needs to represent 12 seconds, it will display the maximum value that occurred during those 12 seconds.) If
you toggle to MinLine, Touchpoint Pro will display the minimum value within each set of points.
Note: The Web Server will by default display both MaxLine and MinLine. This can be changed to show only
MaxLine, only MinLine or both.
Figure 7.17 Trend Graph Screen
