9.2.4.4 Trend characteristic
Application
The temporal course of the corresponding measured variable over the selected interval is
shown in a trend characteristic. The trend characteristic provides an overview of the previous
development of the measured value and can be used as the basis to estimate the future course.
If sufficient measured values are available, trends over the last 30 minutes, eight hours, five
days, two months and 30 months can be processed.
You can use the menu item "Trend charts" to display trends of the following sub-menus:
● Actual value
● Control deviation
● Leakage
● Stiction (slipstick)
● Zero point
● Upper endstop
● Temperature
● Deadband
9.2.4.5 Histograms
Application
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 control valve has been designed
practically and whether it was essentially in the expected operating point during its use so far.
You can use the menu item "Histograms" to display histograms of the following sub-menus:
● Position
● Control deviation
● Temperature
9.2.4.6 Alarm logbook
Application
You can use the menu item "Alarm logbook" to display information about the time stamp,
operating hours, interrupts and status.
Functions/operations using PROFIBUS PA
9.2 Acyclic data transfer
SIPART PS2 with PROFIBUS PA
208 Operating Instructions, 05/2019, A5E00127926-AC
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