In BAS terminology, what does the 'present value' property represent?

In BAS terminology, what does the 'present value' property represent?

• A. The current reading of a point.
• B. The historical maximum value of a point.
• C. The configured override level for a point.
• D. The alarm severity for a point.

Answer: (A)

The present value is the live, current reading of a point. It reflects what the sensor or device is reporting right now and is what you typically see on dashboards, in trends, and in the control logic that runs the system. For an analog sensor like a temperature input, the present value is the real-time temperature (in engineering units). For a digital input, it’s the current on/off state. This value updates as new data arrives and is used to make real-time decisions, display values, or feed control loops. This is different from historical values, which represent past data stored for trend and analysis, and from a configured override or a commanded setpoint, which are values you want the system to achieve rather than what is actually being measured. It’s also separate from alarm severity, which describes how critical a condition is rather than the actual measurement itself. If the sensor stops reporting, the present value may indicate a fault or be blank, signaling a communication issue rather than a normal reading.

The present value is the live, current reading of a point. It reflects what the sensor or device is reporting right now and is what you typically see on dashboards, in trends, and in the control logic that runs the system. For an analog sensor like a temperature input, the present value is the real-time temperature (in engineering units). For a digital input, it’s the current on/off state. This value updates as new data arrives and is used to make real-time decisions, display values, or feed control loops.

This is different from historical values, which represent past data stored for trend and analysis, and from a configured override or a commanded setpoint, which are values you want the system to achieve rather than what is actually being measured. It’s also separate from alarm severity, which describes how critical a condition is rather than the actual measurement itself. If the sensor stops reporting, the present value may indicate a fault or be blank, signaling a communication issue rather than a normal reading.