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American Institute of Chemical Engineers |
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What on earth is an SP88 or an S88, you ask? Approximately 15 years ago, the ISA SP88 Committee took on the task of writing an S88 Standard to define Batch Control as a way to standardize various aspects of batch control in a way that allowed the various aspects to fit together. Through experience, fortunate timing and, yes, spectacular luck, the standard has been an overwhelming success. For the past 10 years, the S88 Standard has served as the basis for almost all of the newer batch oriented control systems on the market. As a result, a new approach to batch control has emerged, has been accepted broadly, and has had a real impact on the batch control market, which now equated to about $4.5 billion a year. What did the S88 standard add to our knowledge of control? In part, it defined a hierarchy of modular control that lends itself to reusable control components. It also promoted flexibility by allowing a recipe to determine the product related characteristics of a process, while equipment control functions are imbedded in the reusable modules. Further, it defined and gave names to the modules we have always had in basic control. Additionally, it defined a layer of procedural control that allows sequences of control actions to step a process through a recipe-defined procedure. Moreover, it defined coordination control which keeps all the other pieces and parts properly sorted. Overall, the S88 Standard has provided an efficient means for collecting data in an understandable way from a process that, by its nature, is constantly changing state. S88 was adopted as an ANSII standard about ten years ago and, more recently, became an international standard (IEC61512-01). Since the original standard was first published, two more parts have been issued, and approved, and a fourth part is now underway. However, the seminal work of the S88 Standard remains the original work or part of the standard and all of the implementation-oriented work that has followed is based on the original work. One of the more interesting realizations that have evolved from the work is that S88 principles are just as applicable to continuous processes as they are to batch processes. Also, interestingly, that S88 principles are now being applied in the packaging industry.
This presentation is an overview
of the S88 Batch Control Standard. It will cover the basic principles outlined
in the standard and the way those principles can be used in any process
manufacturing application. It will touch on the benefits of a modular approach,
the flexibility of a separate recipe, data collection in a batch environment,
and the application of the standard to manual and partially manual processes. |
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