Your application may require many modules that are similar or identical. The DeltaV System provides several features that reduce engineering time, promote reuse of engineering work, and minimize the maintenance required for modules.
Two key features for reducing engineering and maintenance time of your control strategies are module classes and module templates. Module classes are modules that you define. They define components (parameters, a history collection strategy, alarms, conditions, and algorithms) for a group of similar modules. Modules based on a class are referred to as instances or class-based modules. The module class remains linked with its instances so that, in general, changes to the module class propagate to the instances. Module templates are fully-configured modules that can be modified to fit your control needs. The DeltaV System ships with several module templates. You can also create your own module templates. Module templates can be based on module classes.
Understanding these features and using them together helps you significantly reduce engineering time and upkeep on your modules.