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Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 11 Data acquisition 23.04.2009
11 Data acquisition
11.1 Trend
11.1.1 Connections and use
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Trend
Function block ”Trend” is used for time-related recording of measured values.
It provides 4 independent trend channels.
A trend channel can record 1 measured value.
Each trend view can display 2 trend channels: Primary channel plus extra channel as a
reference.
It is possible to record signals from local inputs of the controller plus room and outside
temperatures via bus.
11.1.2 Views
The following illustration shows a 24-hour view on the operator unit with primary trend
curve and reference curve of an extra channel:
• The current 24-hour views (8 minutes, 8 hours, 24 hours) show the date and the
current value of the primary trend curve at the top
• 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 2
channels do not match, a warning symbol appears below the axis
Use the select-and-push knob on the operator unit to navigate between the 4 different
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.
Purpose
Example
Contents
Change between views
Note:
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