PPDS Optimizer - Can it constrain more than one capacity on an operation

[paulc_]

Hello,

I have a question on the capabilities of the PPDS optimizer to constrain multiple resources on an operation. I am going to provide a scenario and two examples.  The difference between the two examples is the Scheduling Basis that you set on the Scheduling Tab of CR02.

Assume you have a workcenter set up in the following manner:

• In ECC the workcenter has both a machine and labor pool capacity
• Both of the capcities are marked as relevant to finite scheduling
• The machine capacitty is avaiilable 24 hours a day, 7 days a week
• Assume the labor pool is available only one 8 our shift a day and only on Monday and Tuesday

Example 1:

• The scheduling basis is set to labor pool
• Two order that requires 24 hours of capacity needs to be planned for same day thru the work center
• After the MRP heuristic(infinite plan), the two orders are both planned with 8 hours on Mon, Tues and the following Monday. It is respecting the 8 hours of capacity available for the labor pool for each order, but the orders are overlapping because it is an infinite plan.  It is respecting the 8 hours becasue the scheduling basis is the labor pool. 
• Run the Optimizer, The two orders will no longer overlap. One of them will Run after the first Order that is planned Mon, Tue,Mon.

Example 2

• The scheduling basis is set to machine
• Two order that requires 24 hours of capacity needs to be planned for same day thru the work center
• After the MRP heuristic(infinite plan), the two orders are both planned with 24   hours on Mon. It is respecting the 24 hours of capacity available for the machine. The orders are overlapping, becasue is an infinite plan.  It is respecting the 24 hours on the machine becasue the schedling basis is machine. 
• Run the Optimizer, The two orders will no longer overlap, thet will be planned with one on Monday and the other on Tuesday.

Questions:

• Does what I describe make sense based on  the difference being the Scheduling Basis?
• Is there anyway to make the capacity constrainst of the two capacities be repsected at the same time? Or do you have to pick one with the scheduling Basis?

Thanks

[Former Member]

Hi Paul,

I am not able to understand  business requirement why you want to optimization for both capacities i.e. labor and machine ? is this requirement?

PPDS optimization is mainly used for sequencing purpose i.e. reduction set  up times.application  will be  machine capacities .

I don't know what you want to achieve by doing the Labor pool optimization

For labour pool capacities Can be used by several operations indicator should be  active in ECC work center data.

Before deciding going further  whether optimization based scheduling is required or Heuristic based scheduling is required decide first.

Br

Sandeep

[Former Member]

Hi,

the capacity constraint is at the activity-resource level, so no problem there. To separate scheduling from capacity effects, please try closing capacity in the planning board in both case scenarios for the resource in the non-scheduling activity (assuming both are relevant for finite sch.), it should affect the optimizer/sch.heuristics results (not MRP).

Regards,

J.

[paulc_]

J,

Thanks for the repsonse.  I am not completely clear by what you mean by "Closing capacity in the planning board".  I forgot to mention that for the labor pool, shifts and intervals are defined for the 8 hours available on Mon and Tuesday. So the capacity is already blocked off for the other days and shifts of the labor.

While machine is available 24 hours a day.

Thanks
Paul