Setting the Event configuration property to Floating limit enables the Floating limit extension. This extension detects whether the object's present value exceeds a range defined by a setpoint. The range is comprised of a high-offset, a low-offset, and a deadband.

The Floating limit extension can be applied to these objects:

  • Analog_Input
  • Analog_Output
  • Analog_Value
  • Pulse_Converter

Selecting the Floating limit extension enables the properties outlined in this table.

Property name

Description

Object name reference

References the object providing the setpoint.

Setpoint value reference

A read-only property that references the object providing the setpoint.

Source property identifier

A read-only property that specifies the setpoint property for the event enrollment object instance. By default, the Source property identifier will display as a property short name (for example, PrVal). But, it can also display as a BACnet property ID (for example, 85).

Setpoint property identifier

A read-only property that specifies the device object property reference of the setpoint value.

High difference limit

Specifies the high offset from a setpoint for the normal range.

Although the default value of this property is 0, synchronizing it with a negative or zero value will result in a configuration error. Configure this property to a positive non-zero value to clear the configuration error.

Low difference limit

Specifies the low offset from a setpoint for the normal range.

Synchronizing this property with a negative value will result in a configuration error. Configure this property to a positive or zero value to clear the configuration error.

Hysteresis to normal (deadband)

Specifies the deadband that is applied to the respective limit before a return to Normal event state is indicated.
NOTE: The object's present value must be less than the difference between the High limit value and deadband value or greater than the sum of the Low limit value and the deadband value before a return to the Normal event state occurs.

Time delay

Specifies the amount of time that must pass between detecting offnormal conditions and sending an event notification. Enter a time in seconds.

If the Object-Name-Reference is not successfully resolved, object-property-reference shall be set to default, reliability shall be set to configuration-error, and the EEO will not detect event states or issue event notifications.