User Manual

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Building Technologies Operating Instructions for ACS Operating and ACS Service CE1U5640en
HVAC Products 3 Applications Dec. 1, 2005
3.5 Offline trend
3.5.1 Introduction to the "Offline trend" application
This application is not contained in all ACS7… software packages. For more information,
refer to chapter Licensing.
This application enables any data points of the plant to be logged.
The trend definition defines the description, the selected data points of all devices
contained in the plant and the sampling interval. It is also possible to define the beginning
and end of logging.
With offline trend, there is no connection between plant and PC. All acquired data will be
downloaded to the memory card in the central unit. For this reason, the "Offline trend"
application is only provided in the case of plant using a central unit that supports this
function (central units type OZW775 and OCI600).
The graphic display of trend logging takes place after reading the logging from the central
unit. Previous trend logging can be graphically presented again at any time.
Trend logging can be printed out and exported as an ASCII file.
For more information, refer to the following chapter:
• Processes in the "Offline trend" application.
3.5.2 Processes in the "Offline trend" application
The following processes are described in this chapter:
• Creating / changing an online trend definition
• Selecting data points for online trend logging
• Starting online trend logging
• Evaluating online trend logging
• Printing in online trend
• External editing of online trend logging
3.5.3 Creating / changing an offline trend definition
A trend definition defines the data points that shall be logged. For one trend definition,
one logging processes can be started: During logging, the data points selected in the
trend definition will be logged and stored in the central unit. The data stored in the
central unit can be transferred to the PC for evaluation. At a later time, logging of the
same trend definition and with the same data points can again be started.
Procedure with OZW775:
A. To create a new trend definition, select in the left window of the "Offline trend"
application the uppermost directory (plant name). Position the onscreen pointer in
the right window of the application and press the right mouse button. A menu is
opened. Select New – Offline trend definition.... Window Offline trend
properties is opened. It is subdivided into several sections:
General: Enter the name of the trend definition. Additional information fields for
optional data are available. You can state the Location of the plant, the
Installer who has created the trend definition, or give an additional
Description of the trend definition.
Click the >> button when your entry is completed.
Interval: Set the interval to indicate when and how often the logged data points
shall be saved.
Trend definition
Trend logging
Creating a trend definition