After receiving the approval for a control system replacement project, how do you decide between phased migration and a complete replacement? Do you keep some of the old and integrate the new, or just go with a fresh start?
Now it’s time to setup the plant for the highest possible return on a project that was hard to justify in the first place. There are so many questions that should drive the selection of the control system. What is its expandability? How well does it play with my “other” systems? What is my support learning curve? When you have answered these questions and have selected a control system, the hard part is done right? Not even close; it is time to execute what model you choose. Let’s discuss two typical migration models, phased migration and complete replacement. So now you must consider what should stay and what should go.