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This is a short summary, for more information, see the work instruction Maintain Changeovers.

Changeovers are defined by flexible, attribute-based rules.   There are three steps in the process:

1. Create Standard Changeovers.  These are simply a name to identify the type of changeover and its duration (and optionally cost)

   . They are used in Changeover Rules creation as standard options for changeover types

   .

2. Create Changeover Rules.  These define when a changeover is required

   (

   .

   1. Set the length of the Changeover Rule, either by selecting a Standard Changeover or

   enter the time here). They are based on criteria like:
   1. Attribute changes, contaminant cleaning, and line mode changes.
   2. They can be limited

      entering a custom time.

   3. Select the Rule Type from the following options: Contaminant Clean, Default, Line Mode Change, Material Attribute Changed, Order Attribute Changed, Periodic, and Simple.

   4. Changeover Rules can be defined to apply only to a specific production line or group of lines

      and can also be applicable

      , or to apply to all lines.

   5. The attribute whose value change used to trigger the rule.
   6. The contaminant list changes. If the list of contaminants of product-from is a subset of the list of contaminants of product-to, no specific cleaning is required. However, if some contaminants of product-from are not in the list for product-to, this may require a lengthy and expensive cleanup procedure.

3. Assign priorities to the rules.  When a change triggers the criteria for multiple changeover rules at the same time, priorities are used to determine which changeover rule will be used.  For example, when changing color, count, and size at the same time, it may be that the size changeover is the most time-consuming. The greater numerical value of the priority attribute means higher priority for a given rule.

...

Periodic Changeovers

Periodic Changeovers behave differently than changeovers with the other rule types. These changeovers are not related to the product change on the line, but rather for regular maintenance procedures, which should be undertaken on the line within the specified time period. If such rules are created, Phenix Scheduler will create periodic changeovers inside the schedule with required periods. Examples of periodic changeovers are:

1. Regular Inspection, cleaning, and lubrication.

2. Periodic thorough cleaning/washout regardless of the products being produced.

See the Master Data work instruction for Maintain Changeovers for more informationFor more information on Periodic Changeovers, see Scheduling Periodic Changeovers.