The last blog post, “A Results Driven Approach to improving overall HMI design” described the needs of achieving
safety and economic goals in order to deliver the expected business value for
an industrial operation. However, if the safety and economic goals of a process
are not considered during the design of the interfaces by which the system will
be controlled and operated then it is doubtful those goals will be achieved. To
better achieve these goals, they must be strongly taken into consideration
during the design of the HMI application.
One
method for assisting in designing and identifying the goals of an application
is called Goal Directed Task Analysis (GDTA). As depicted in Figure 4, the
GDTA process begins with the major business goals of the system. An example of
a business could be to minimize the cost associated with energy usage.
Figure 4: Goal-Decision-Situation Awareness Requirement Structure
From these
major goals an analysis of the system will be performed to determine the sub-goals. The sub goals will
be more specific goals that are directly related to the process such as
minimizing steam utilization during the cleaning process. These sub-goals need
to be actionable. It must be understood what decision the operator is being
asked to make and then design the HMI so that an operator can be easily trained
on how to make that decision and ultimately achieve the original goal. For each
sub-goal it must be considered how the operator will attain Level 1 perception,
Level 2 comprehension, and ultimately Level 3 projection. Only once the
business goals of a system are clearly understood can the system itself be
designed to achieve them.
Source:
Krajewski, John (“Situational
Awareness The Next Leap in Industrial Human Machine Interface Design”
Are you considering this
approach in your facility today? Let me know in the Comments section below
In
the next few posts I will provide a detail view at other tools and techniques
available (effective window structure, effective
color usage, actionable alarm management, and effective design elements) to improve
the operations outcomes mentioned above.
Related
Links:
- Top 5 trends that currently drive the need of the modern industrial HMI application
- The Impact of Human Error in Industrial Automation
- A Results Driven Approach to improving overall HMI design
Sign up today
to get the weekly Wonderware HMI/SCADA Times newsletter at http://situation-awareness.com/ and click on Subscribe and you will be receiving a
FREE copy of the recent White paper: “Situational Awareness, The Next Leap in
Industrial Human Machine Interface Design”
No comments:
Post a Comment