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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / capcicty planning for ...
Microsoft Dynamics AX (Archived)

capcicty planning for bottleneck work center

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Posted on by kongyu 420

 Hi,

Does any one know how Ax plan for bottleneck work center.

I tested and not able to simulate and see the differences.

pls help and guide me how Ax work on this.

Thanks in advance.

 

Regards,

Kongyu.

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I have the same question (0)
  • Huzaifa Gain Profile Picture
    Huzaifa Gain 450 on at

    How have you tested? If you testing performance of AX then I think you can use AX performace toolkit on codeplex. 

  • kongyu Profile Picture
    kongyu 420 on at

     Hi,

    Unfortunately, i test it and not able to  get the expected result. Can you guide me how to test the bottleneck work center.

    Thanks.

  • Huzaifa Gain Profile Picture
    Huzaifa Gain 450 on at

    What do you mean by Work center ?

  • kongyu Profile Picture
    kongyu 420 on at

    Hi Huzaifa,

    In the Basic, work center group> work centers button> Select a work center> at the General tab page> "Bottleneck resources".

    Do you know how Ax work with this  "Bottleneck resources"?

    i test many time and can't see the result.

    Regards,

    Kongyu.

  • Huzaifa Gain Profile Picture
    Huzaifa Gain 450 on at

    Sorry i misunderstood your question. I have copied a link , see it may help you. 

    Managing your supply chain using microsoft ax

    http://books.google.com/books?id=uUM00jNxhV4C&pg=RA2-PA1192&dq=Dynamics+AX+bottleneck&hl=en&ei=z3mHTMvxHoGosQPg7sG7Cg&sa=X&oi=book_result&ct=result&resnum=3&ved=0CD8Q6AEwAg#v=onepage&q&f=false

  • Evert Bos Profile Picture
    Evert Bos on at

    Kongu

    I finally decided to test the Bottle neck resource checkbox extensively, we have had it since 2009 and I tell customers it works like the E Goldrath TOC theory but I never really saw it work and no customer expressed much interest. But all my testing showed no difference EVER using this checkbox.

    Operation or job scheduling, no difference. The results were always identical.

    I had three workcenters in a routing of 3 operations. the first two are finite capacity. And I made the one on operation 20 the bottle neck. I expected the system to schedule the bottleneck first, then schedule operation 10 backward from that and operation 30 forward from 20.

    Thinking of another situation I have to set up to test this functionality but right now I have the impression this checkbox does nothing..

  • Suggested answer
    guk1964 Profile Picture
    guk1964 10,888 on at

    This is what the mrp performance white paper says:

    “Bottleneck scheduling

    Every work center has a checkbox that you can select to indicate whether the work center is a bottleneck resource. In addition, the new Bottleneck capacity time fence feature has been introduced on ReqPlan.  

    It is recommended that you carefully examine the routes and mark only appropriate work centers as bottleneck resources. You can also set the finite-capacity time fence to a low value and assign the previous finite-capacity time fence value to the Bottleneck capacity time fence.

    The combination of [primary work center finite + secondary work center infinite] will provide much better accuracy and performance than [primary work center infinite + secondary work center finite]. “Finite” in this context indicates a work center that is scheduled with finite capacity due to a finite-capacity time fence or a Bottleneck capacity time fence.

    This performance behavior is not new to Microsoft Dynamics AX 2009; it occurs because conflicts on the primary work center are resolved before moving on the secondary work centers. In cases where the primary work center is scheduled with infinite capacity and the secondary work center is scheduled with finite capacity, the logic goes through additional code loops, and there is a chance that “max number of conflicts” parameters will be reached quickly. This is especially true when the secondary work center has a large number of conflicts.

    (Note: It is outside the scope of this white paper to discuss the importance of scheduling planned orders only on the basis of bottlenecks. If this feature is used correctly, you should experience improvement in planning results accuracy along with better performance.)”

    From the white paper quote it seems to apply only to  finite capacity (which makes sense) and  that careful tuning of the bottleneck time fence  setting is needed to see any difference.( which I think also make sense).

  • Ismael Quteifan Profile Picture
    Ismael Quteifan 676 on at

    Where can I get a copy of the performance white paper?

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