Control programming made easier
David Chappell, Control Engineering “Standard Profits: Make2Pack and ISA88” blog author notes in a recent post that: “It seems to me that the programming languages and function blocks available to industry today do not impose any recognizable structure or methods in their use to satisfy automation requirements. When evaluating an automation solution using today’s tools it seems that one must first learn the implementer’s ‘language’ and syntax to understand how the ‘words’ represented by function blocks and EDDL and other great tools are organized and directed to deliver the solution.
Is the language read from left to right and top to bottom? Or bottom to top and right to left? Of does it start in the center and serial outward counterclockwise? Often more time is spent in deciphering the ‘language’ of the implementer than understanding the application and how the recognizable function blocks and EDDL components are used.”
Chapell recommends using the ISA88 Part 1 equipment and control models to help provide a recognizable structure. Then apply the bounding concepts of Part 5 to 1131 and EDDL, as well as other languages, objects, and programming.
“Doing so creates a repeatable and recognizable form that guides implementers to more recognizable solutions that are flexible, repeatable, reusable, and more easily updated by anyone familiar with the standard,” he says.
To read Chappell’s blog and track the latest updates from the World Batch Forum’s Make2Pack efforts through ISA88 Part 5, go to www.controleng.com, click on the “Blogs” tab, then “View all blogs” and select Chappell’s “Standard Profits” blog.