Zero

The Zero attribute ideally represents the lowest possible value for an input or an output tag. The Zero attribute is not the same as the instrument Zero (InstZero), which is described in the extended descriptor. Do not assign a value to the Zero attribute for PI Points of type digital. Changing the Zero attribute for a digital tag can adversely affect the configuration of the PI Point. The Zero attribute is optional and has a default value of 0.

The interface will not exclude or alter values that are less than the Zero PI Point attribute. If the value is less than the Zero attribute or higher than Span attribute, the Interface will not alter it and the value will still be sent into PI server.

The interface only uses the Zero attribute to perform the conversions that are described under the SquareRoot PI Point attribute.