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 ...).

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