"Foxboro's S88 approach and phase sequencing software makes the system easier to use and more bulletproof by forcing operators to perform a sequenced start up," says Norman Voigt, process manager, who oversees process control for Universal Flavors. "I especially like the way their solution maps very smoothly over the S88 model.
Control Modules receive their commands from the S88.01 Phases, which are isolated from the complexities of starting the control loop. The S88.01 Batch Executive starts phases according to a pre-defined recipe, which is changeable only through programming. However, the path through the recipe can be modified based on process conditions and operator input.