TagZero

For an attribute with a PI point data reference, get a PI point's "zero" value from the point database.

Syntax

TagZero(attname)

Arguments

• attname

  The name of an attribute with a PI point data reference, enclosed in single quotes

Returns

The point's zero value. If the point type is integer or real number, this is a number; if the point's type is digital, this is a digital state (character string)

Exceptions

If the point does not exist, returns an error

Example

• TagZero('sinusoid')

  [Returns 0]

• TagZero('cdt158')

  [Returns 50]