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6 Data
acquisition
6.1
Trend
6.1.1
Connections and application
Trend
Use the Trend function block for time-related recording of measured values. It
provides 4 independent trend channels.
Purpose
A trend channel can record
one
measured value.
Two trend channels can be displayed for each Trend view:
Primary channel and extra channel (as reference).
It is possible to record signals from local inputs of RMS705B as well as room
temperatures and outside temperature via bus.
6.1.2
Views
The following illustration shows a 24-hour view on the operator unit with primary
trend curve and reference curve for an extra channel:
Example
Contents
The current 24-hour views (8 minutes, 8 hours, 24 hours) show the date and the
current value of the primary trend curve.
The primary trend curve is shown as a solid line, the reference curve as a dotted
line.
The Y-axis label refers to the settings of the primary channel. If the Y-axes of the
two channels do not match, a warning symbol appears next to the axis.
Use the press-and-turn button on the operator unit to navigate between the four
different views:
Change between views
8-minute view:
Sampling every 5 seconds, last 8 minutes.
8-hour view:
Sampling every 5 minutes, last 8 hours.
24-hour view:
Sampling every 15 minutes, current day.
Rolling over the last 6 days: Sampling every 15 minutes, last 6 days.
The 24-hour view shows the last 6 days.
Note
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Siemens
Switching and monitoring device RMS705B
CE1P3124en
Building Technologies Data
acquisition
01.04.2010