User Manual

93/101
Building Technologies Operating Instructions for ACS Operating and ACS Service CE1U5640en
HVAC Products 5 Tips and tricks Dec. 1, 2005
• Whether or not a data point can be uploaded or downloaded
• The possible setting values for a data point and the default value of the data point
when the device was supplied
• The way operating pages must be represented in the "Popcard" application
• The picture and data points that shall appear in the "Plant diagram" application
• The data points of the "Parameter set" application connected to the Wizard
• The data points that can be selected for editing in the different applications
The device descriptions cannot be changed.
If, subsequently, new devices are added to the plant, it can occur that the program
does not have the device description required for the specific device. In that case, the
device is identified by a grey rectangle with a cross inside
. You may be able to
access certain data points of the particular device, but not all, and it is also possible
that you see certain data points in the ACS... program that do not really exist on the
device. In that case, invalid values will be displayed. To get a device description of the
latest devices, please contact your Siemens sales office.
Some systems use devices not supplied by Siemens. There are no device
descriptions for such devices available. Devices of that kind are identified by a grey
rectangle with a cross inside. You may be able to access certain data points of the
particular device, but not all, and it is also possible that you see certain data points in
the ACS… program that do not really exist on the device. In that case, invalid values
will be displayed. Siemens may not be able to provide device descriptions for such
devices.
Devices that have been replaced since the device list was last updated are identified
by the
symbol.
For more information, refer to the following chapters:
• The first steps
• Working with connections
• Working with a plant
• Navigating through a plant
• Working with the devices
• Applications
5.5 Data point
Data points deliver dynamic information about the devices.
After all information about the devices contained in the plant has been transferred to
the PC, the relevant devices are stored in the plant file. The program knows all
devices installed in the plant. The device types present are automatically identified
and also the type of plant diagram selected on the device.
The program delivered also includes a device description of each device. Based on
information given in the device description, the program knows automatically:
• The data points contained in a device: These can be selected from the various
applications for editing
• Whether the data point can be uploaded or downloaded:
• Data points that can be downloaded are identified by a solid circle
• Data points that can only be uploaded are identified by an empty circle
Data point