BadVal

Test a value to see if it is bad. For an attribute associated with a PI point, any system digital state value is considered bad (No Data or Calc Failed, for example).

Syntax

Badval(x)

Arguments

• x

  any expression evaluating to a value

Returns

True if the value is bad

False if the value is not bad

Exceptions

Returns True for blob PI points. Returns False for string PI points

Example

• BadVal(1/0)

  [Returns True]

• BadVal(10)

  [Returns False]

• BadVal('att1')

  [Returns True if the value of 'att1' is bad]

• BadVal(FindEq('att1', 't', '*', 10))

  [Returns True if the embedded function (FindEq in this example) has no result or has error for any reason]