TagBad

For an attribute associated with a PI point, test the point for an abnormal state at a specified time. If the point is an integer or real number, any digital state is considered abnormal. For digital points, the states that are defined for that point are normal; all others are abnormal.

Syntax

TagBad(attname [, t1])

Arguments

• attname

  An attribute associated with a PI point

• time

  Optional: A time expression. If omitted, current time ('*') is used.

Returns

False if the point's state at time is normal, True if it is abnormal.

Exceptions

None

Notes

BadVal can test any value or expression; TagBad can only test a PI point.

Example

• TagBad('att1')

  [Returns True if PI point for 'att1' does not exist or its value corresponds to system digital state (No Data, for example)]

• TagBad('enum_att1', '14-Dec-16')

  [Returns True if PI point for 'enum_att1' does not exist or its value corresponds to system digital state (No Data, for example) at 12:00am on December 14th, 2016]