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Machine modes, procedures, execute state
February 7, 2008
Recent discussions in the committee have included an explanation that there does not have to be a recipe/equipment procedure running when a machine is in the execute state. That is because the Control Component (automated or manual) that manages the Unit/Machine Recipe/Procedure can be used to bring the equipment control to the executing state and the remains active and monitoring the transition rules for the active Recipe/Procedure and stands ready to process any Procedure associated with the needed Operation that the transition rules indicate should become active.
The Control Component that manages the Unit/Machine was activated when the recipe/equipment procedure was selected and stated. Once started it sequences and activates the ordered and referenced operations (Starting, etc. Etc.) per the transition rules.
When the execute state of a machine is achieved the procedural/recipe may have nothing left to do, if the cycling that occurs during “Execute” occurs within the equipment control, but wait till the transition rules indicate another operation (Stopping for example) needs to be activated. When indicated by the transition rules that the Unit/Machine is no longer active the Control Component will become inactive and ready for a new Recipe/Procedure (sanitize, clean-out, or production of another product) to be selected and activated.
Questions? Post a comment, using the tool provided. Tomorrow, I will include some discussion about the PackML State Model.
Posted by David Chappell on February 7, 2008 | Comments (1)
In response to: Machine modes, procedures, execute state
Francis commented:
Recent discussion among S88 subscribers to the Part 5 group have NOT agreed on this at all. That such a statement should be presented here is a surprise.... There is another view that whenever some processing is going on a Control Recipe Procedural element Must be running.