1 December 2005
ISA Certified Automation Professional (CAP) Program
This question is from the CAP study guide, Performance Domain IV, Development.
Definition: Software development and coding
The graphic display for a distillation column in a refining train would BEST fit in the HMI Display hierarchy at which level?
The best answer is C, Group.
A typical hierarchy is composed of displays at four levels:
Plant level - Provides information regarding the entire plant.
Area level - Provides information on portions of the plant equipment that have a working relationship.
Group level - Provides information for the control loops and data points relating to a single process unit within a plant area.
Loop level - Provides information that deals with individual control loops, sequences, or data points.
A distillation column refers to one piece of equipment in the distillation process that will contain several loops. Therefore, it falls into the group-level category.
Reference: Lukas, Distributed Control Systems, Van Nostrand Reinhold, 1986. y
Nicholas Sheble (email@example.com) edits the Certification department. For information about the CAP program, go to www.isa.org/cap.