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Configurable Plots
The number of plots varies with product type, but the standard setup will
plot the first n sensors where n is the number of plots.
e.g. for an AHU Controller
Plot 1 Supply air temperature
Plot 2 Return Air temperature
Plot 3 Heat/cool output -100 to +100 (negative for cooling)
The plot routine has been enhanced and the plotting period is now selectable
by changing the plot Period Type parameter PT . This
matches Doorway (and TREND) and is as follows
PT (A,B,C or D)
|
Period type
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1
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Every 15 minutes
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2
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Once per day at 0100
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3
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Every minute
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4
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Every hour on the hour
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It is recommended that period type 3 is not generally used except while
commissioning since frequent plot re-scaling (every 90 minutes) will eventually
wear out the EEPROM memory.
The plots are now automatically re-scaled within the controller to achieve
the best resolution for the data recorded. This happens at the end of
every 96 readings when new maximum and minimum settings are calculated
and also if a new value is outside the current range settings.
The parameter to be plotted can be changed
form the standard settings, by setting the configuration parameter PN
to the config number of the parameter to be plotted. The config numbers
can be found in the Config Tables for the particular product.
Plot configuration
*The plots are designated by letter A,B,C or D. Many products only support
two plots A and B.
ref
|
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Description
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default
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range
|
C130
|
PN A
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config variable number for channel A
|
51
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0 to 255
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C131
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PT A
|
period code for plot A
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1
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1 to 4
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C132
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PN B
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config variable number for channel B
|
52
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0 to 255
|
C133
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PT B
|
period code for plot B
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1
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1 to 4
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C134
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PN C
|
config variable number for channel C
|
53
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0 to 255
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C135
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PT C
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period code for plot C
|
1
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1 to 4
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C136
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PN D
|
config variable number for channel D
|
54
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0 to 255
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C137
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PT D
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period code for plot D
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1
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1 to 4
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