Semi-Conductor Routing

Dear Semicon experts,
Wafer fabrication routing is very complex with over 500 operatrion to make wafers from raw material. Do you really define all operation in routing if you are using SAP PP ?
I would assume , routing will be at aggregate level & will be used for costing only. Generally , it is impossible to use it for Scheduling because there are many alternate machine , re-entrant flow( raw material enters same machine for different operation). Shopfloor use some kind of MES software to plan loading of machines
SAP -PP also has problem in capacity intensive manufacturing as to whether to group similar machine as one workcenter or keep each machine as workcenter & model many routing. Problem intensify with above compleity.
Any workable PP solution implemented for wafer fab?
thanks in advance
Jatin

Jatin
Wafer fabrication routing is very complex with over 500 operation to make wafers from raw material. Do you really define all operation in routing if you are using SAP PP ?
Depends on the business requirements. You can create a PP solution with as many or as few operations as required.
I would assume , routing will be at aggregate level & will be used for costing only
This is possible.
Generally , it is impossible to use it for Scheduling because there are many alternate machine , re-entrant flow( raw material enters same machine for different operation).
This is not true. Strictly speaking, scheduling involves calculating the duration of various operations, and subsequently calculating the start and end dates of these operations. This is one of the easiest problems for a planning engine to solve.
More complex planning problems involve trying to solve for both capacity constraints and also material constraints in a single solve. Automagically selecting from multiple possible flows, using complex decision trees, is also a very complex planning problem. PP does not stack up well compared to some of the more modern planning engines IF such functionality is required. Luckily, there are thousands of businesses (including Fabs) that have discovered that it is not business critical to have such functionality in their ERP solutions. These companies happily chug along in SAP PP.
SAP -PP also has problem in capacity intensive manufacturing...
SAP PP, like any software, has problems meeting everyone's business requirements. SAP PP is an MRP solution, with a CRP addon. There are other solutions that have better capacity-related problem solving capabilities.
...as to whether to group similar machine as one workcenter or keep each machine as workcenter & model many routing.
This is not a software problem, this is a business decision. SAP PP can support the creation of many work centers, or the creation of many routings, or a combination of both.
Problem intensify with above complexity.
ANY complex problem will require a complex solution. In general, the more complex the solution, the more difficult and expensive to implement and support. This rule does not just apply to SAP PP, but also to the more robust planning engines I spoke of earlier.
Any workable PP solution implemented for wafer fab?
SAP PP has been implemented in dozens of Semi companies to plan their Fabs. Talk to your SAP account rep, and he might be willing to help you arrange to meet with one of his local Fab customers that use PP only.
Best Regards,
DB49

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"Sander Mathews" wrote:
>>Hey all, I am working in the lab over here at Sycamore Networks for a list>of
drivers that support GP-IB and run on LabView, not LabView CVI or >VEE, LabView
only. I have been searching the NI webpage but am unable>to find any mention
from the following list. >8163a Lightwave Multimeter >86142a Optical Spectrum
Analyzer>8164a Lightwave Measurement System >81635a Power Sensor >8156a Optical
Attenuator>83480 Digital Communication Analyzer>70004a Display>70340a Signal
Generator>70843b Error Performance Analyzer>86100a Wide Bandwidth Oscilloscope
>8753ES S- Parameter Network Analyzer>SB Series Fiber Optic Switch>AQ6317
Optical Spectrum Analyzer>1711 DC Power Supply>1746 DC Power Supply>TSL -210
Tunable Semi-Conductor Laser >LC564 1GHz Oscilloscope>>If you have any information
on where I can find any drivers for any of the>>proceeding equipment I would
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