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Functions/operations using PROFIBUS PA
11.2 Acyclic data transfer
11.2.3.5
Trend characteristic
Versions
Use this menu item to access the following trend characteristics:
● Actual value
● Control deviation
● Leakage
● Static friction
● Lower end stop
● Upper end stop
● Temperature
● Dead zone
Use
The temporal course of the corresponding measured variable over the selected interval is
shown in a trend characteristic. The trend characteristic gives an overview of the previous
development of the measured value and can be used as the basis to estimate the future
course. If adequate measured values are available, trends over the last 30 minutes, eight
hours, five days, two months and 30 months can always be processed.
11.2.3.6
Histograms
Versions
Use this menu item to access the following histograms:
● Position
● Control deviation
● Temperature
Use
A class division over the entire measuring range of a variable is included in a histogram. The
time spent by the measured variable within different classes is also displayed. You can use
the position histogram to assess whether a servo solenoid valve has been designed
practically and whether it was essentially in the expected operating point during its use so
far.
190
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
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