Honeywell VPR100 User Manual page 172

Programming Function Blocks and Features
Prompt
SET DISPLAY OFF or number
LIMITS
TIMEBASE OFF, discrete parameter, 0,
SELECTOR 1
Displaying trend points logarithmically
To display any trend point logarithmically, follow this procedure.
Step
1 Under the Program menu, select the desired point to be displayed logarithmically. For example, for
Analog Input #1, select Program Analog Inputs, then select Analog Input #1.
2 Change the point's decimal position to X.XXEXX. Save your changes.
3 Repeat steps 1 and 2 for all points you want to display logarithmically.
4 Under Program Displays, Set Up Trend, specify the trend points you want displayed.
5 Under Set Up Trend, Set Display Limits, change the decimal point position to X.XXEXX. Save your
changes. This causes all trend points with the X.XXEXX output decimal position (from steps 1-3) to
be displayed logarithmically. Any trend display containing these points will display them
logarithmically, with the number of log divisions derived automatically from the low and high limits of
the first trend point found with the X.XXEXX decimal position. Trend points without the X.XXEXX
decimal position are displayed normally (linearly).
156
Table 4-55 Set Up Trend 1 Prompts
Range/Selections
VPR & VRX – User Manual
Definition
Set the high and low full-scale display limits for each point. If
you select OFF for a limit on this display, the limits
programmed for the analog point (either RANGE LOW and
RANGE HIGH or OUT LOW LIMIT and OUT HIGH LIMIT) will
be used as the trend limits for that point.
The accuracy of a trended point is determined only by the
original output limits of the point, not by setting wider or
narrower limits here. Setting excessively narrower limits here
will result in a viewable trend with a high degree of
inaccuracy when viewed as a % of the screen. To increase
accuracy over a narrower range, decrease the programmed
output range (limits) of the point itself.
Enter a discrete parameter which will cause trend to display
alternate timebase when ON and normal timebase when
OFF.
Action
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