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EXCEL 50/100/500/600/800 ATTRIBUTES
EN2B-0092GE51 R0512
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Fig. 9. Delay time switching down
Descriptors
Informative descriptors A controller contains up to 128 physical datapoints and up to 256 pseudo
datapoints. The Excel 100C provides 36 physical datapoints. An individual user
address can be assigned to each of these 384 datapoints. 255 plain-language
descriptors can be created with a maximum of 32 characters each. These
descriptors are then assigned to datapoints in the datapoint description via the
attribute "Descriptor". Descriptors complete the information concealed behind the
user address. They can contain, for instance, a reference to a section of a building.
The following list is an example of the relationship between user addresses and
descriptors:
User Address Descriptor
Room temp floor 1 Heating circuit, West wing
Room temp floor 3 Heating circuit, West wing
Room temp floor 10 Heating circuit, East
Room temp corridor Heating circuit, East
Flow temp floor 1 Heating circuit, West wing
Lights floor 1 Building section V
Lights corridor Building section V
Engineering Unit
The attribute "Engineering Unit" contains a list for selecting different engineering
units for both analog datapoints (physical and pseudo), totalizer inputs (physical
and pseudo), and digital datapoints.
If, for instance, the external temperature is measured by an analog datapoint, the
engineering unit of this datapoint must be set to "°C" or "°F". If the electrical load is
detected by a totalizer input, the engineering unit must be set to "kWh" for kilowatt-
hours.
Feedback Delay
The attribute "Feedback Delay" determines the time delay between, e.g. when a
pump switched on (and detected) and when this status is made available to a
program.
High/Low Alarm/Warning Limits
Specifying limit values In the case of analog inputs (e.g. inputs for sensing room temperature) and pseudo
analog points (for instance, internally computed datapoints for the heating flow
setpoint), two minimum and two maximum monitored limit values may be entered.