Expression examples

The following examples show expressions that evaluate data items and manipulate or do calculations on the values of data items:

• Arithmetic operation on PI points

  ('sinusoid')^3 + 'cdf144'/10

  Returns the sum of the value of the PI point sinusoid cubed and the value of the PI point cdf144 divided by 10.

• Boolean evaluation of PI point

  abs('mytag') >= 14.65

  Returns true (non-zero) if the absolute value of the PI point mytag is at least 14.65.

• Boolean evaluation of PI AF attribute

  '\\Server\Database\Element|Manufacturer' = "ACME"

  Returns true if the value of the PI AF attribute Manufacturer is ACME.

• Complex Boolean evaluation of simultaneous condition of two PI points

  'sinusoid' < 45 and sqr('vdf1002') > 2

  Returns true if the value of the PI point sinusoid is less than 45 and the square root of the value of the PI point vdf1002 is greater than 2.

• Evaluation of digital-state point

  StateNo('BA:Phase.1')

  Returns the digital state number (also known as the digital state code) of the digital point BA.Phase.1 rather than returning the digital state value of the point.