The Device Server Signal Interface

3. The Signal Properties

A set of signal properties is defined in the signal class. The properties must be defined for a device class. They are used for signal identification and the automatic configuration of monitoring and tuning applications and the history database configuration tool.

The properties of a signal object are:
Signal Properties
Property Description
Name The full signal name.
Label A label for the signal value, which can be used in applications.
Unit The unit of the signal value.
Format The format in which the data should be displayed (printf() format).
Description A text describing the signal.
Max A maximum value. Can be used for data display or to check limits of set values.
Min A minimum value. Can be used for data display or to check limits of set values.
AlHigh Above this limit an alarm will be indicated.
AlLow Under this limit an alarm will be indicated.
Delta If the nominal value and the read value of the signal differ by +/- delta during the
number of seconds specified by "Delta_t" , an alarm will be raised.
Delta_t If the nominal value differs from the read value for a longer time than Dta_t seconds,
an alarm will be raised.
Standard Unit A multiplier factor to convert the given signal unit into a standard unit (V, A, W, bar ...).

Signal Properties
Property	Description
Name	The full signal name.
Label	A label for the signal value, which can be used in applications.
Unit	The unit of the signal value.
Format	The format in which the data should be displayed (printf() format).
Description	A text describing the signal.
Max	A maximum value. Can be used for data display or to check limits of set values.
Min	A minimum value. Can be used for data display or to check limits of set values.
AlHigh	Above this limit an alarm will be indicated.
AlLow	Under this limit an alarm will be indicated.
Delta	If the nominal value and the read value of the signal differ by +/- delta during the number of seconds specified by "Delta_t" , an alarm will be raised.
Delta_t	If the nominal value differs from the read value for a longer time than Dta_t seconds, an alarm will be raised.
Standard Unit	A multiplier factor to convert the given signal unit into a standard unit (V, A, W, bar ...).

The Device Server Signal Interface - 27 FEB 1998

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