PVRangeOperatingAutoScale custom property

When PVRangeOperatingAutoScale is True, a symbol uses the value of the PVRangeOperatingPercent custom property to set percentage boundaries above and below a setpoint value to establish a normal operating range. When a measured value is outside of the normal operating range around the setpoint, the symbol goes into full range mode and displays full range flags.

The reference value of PVRangeOperatingPercent is used to internally calculate updated PVRangeOperatingMin and PVRangeOperatingMax custom property values using the following formulas:

• PVRangeOperatingMin = Setpoint - (PVRangeOperatingPercent/100 x Setpoint)

• PVRangeOperatingMax = Setpoint + (PVRangeOperatingPercent/100 x Setpoint)

  Note: Make sure the object attribute references to both custom properties are writeable during run time.

During run time, the symbol uses the percentage range around the setpoint as the symbol's graphic scale with the setpoint always at the midpoint between the minimum and maximum limits. When a measured value moves outside of the percentage range around the setpoint, the symbol's graphic scale changes to use the limits set by the PVRangeFullScaleMin and PVRangeFullScaleMax custom properties. The symbol shows Full scale flags at the ends of its graphic scale to indicate that it is in full range mode.

If PVRangeOperatingAutoScale is set to False during run time, new values need to be set for the PVRangeOperatingMin and PVRangeOperatingMax custom properties. Otherwise, they remain according to the last calculation.

Assign values to the PVRangeOperatingAutoScale custom property

Related Wizard options and custom properties

Associated Wizard options

• FullRangeIndicator: True

• Setpoint: True

Associated custom properties

• PVRangeOperatingAutoScale: True

• PVRangeOperatingMax

• PVRangeOperatingMin