Dan, You are correct that the original reason for splitting the MPS/MRP run was, to some extent, a factor of run time (in mid 70's we used to start a planning run at midnight Friday, and hope it was finished by midnight Sunday..13 level B/M's). I know some companies today that flag all items as master scheduled, and default the requirements flag to (S =both) in the Facility Planning File (MRP140) to avoid missing any external demand that might sneak in as a service requirement. Our planning runs now take less than 8 minutes for the entire blow through. If you have heavy usage of DRP (many different facilities) you may wish to keep the master scheduled items as only those that are sold, or transferred between facilities, but it really isn't a factor of run time anymore for a consideration of a more liberal usage of the (M) code. Frederick C. Davy, CPIM, PMP Business Systems Analyst Interface Solution, Inc. Phone: (315) 592-8101 Fax: (315) 592-8481 e-mail: fcdavy@xxxxxxxxxxxx "Daniel Warthold" <daniel.warthold@xxxxxxxxxxxx> Sent by: bpcs-l-bounces+fcdavy=sealinfo.com@xxxxxxxxxxxx 10/20/2006 10:17 AM Please respond to SSA's BPCS ERP System <bpcs-l@xxxxxxxxxxxx> To "SSA's BPCS ERP System" <bpcs-l@xxxxxxxxxxxx> cc Subject Re: [BPCS-L] Resell Purchased / Master Schedule ? If you regenerate MRP as often as you regenerate MPS, there should not be any problems. The requirements of the MRP items will be cought, and al the necessary orders will be planned to cover these requirements. As a matter of fact., I dont see as much of a need today to spit items between MPS and MRP, given the speed computers can regenerate MRP. My understanding is, 20-30-40 years ago, because MRP took hours to run, there was a need to cut the MRP generation process into a smaller subset of capacity critical or order critical items, the MPS items , and the other non-critical items: the MRP items. Any toughts on this? Daniel Warthold ----- Original Message ----- From: "Al Mac" <macwheel99@xxxxxxxxxxx> To: "BPCS_L discussion" <bpcs-l@xxxxxxxxxxxx> Sent: Friday, October 20, 2006 1:24 AM Subject: [BPCS-L] Resell Purchased / Master Schedule ?
* One rule of thumb says MRP140 needs to "M" Master Schedule End Items that we manufacture and sell for customers, so that MRP will calculate what's needed of all components to be manufactured or purchased. * Another rule of thumb says raw material that we purchase to be used
components of the manufactured parts, nor any sub-components, should
be "M" coded, just the end items that we sell the customers. * A dispute has come up with respect to what is the correct Master Schedule coding for items that are coded purchased, but can also be
customers as THEIR service or repair parts? It has been several years since we had MRP education, so different people memories stray into disagreements needing clarification. I had thought that when the raw materials show up as components of master scheduled items, currently on customer orders, that MRP will correctly calculate how many we need thanks to both dependent and independent requirements, but if a customer orders a supply of our raw materials, that are not currently needed due to being in the BOM of master scheduled active items, then by not having these raw materials master scheduled,
we have effectively told MRP to ignore these requirements, and that
extra items coded as master scheduled did no harm to MRP. We are on BPCS 405 CD mixed mode. We run MRP500 then MRP600 by facility, with a few extra runs of MRP500 thanks to a prior thread on BPCS-L regarding parts complexity. Our BOM has several levels. We used to be heavy into DRP resupply orders, but that part of our business is now about dad. - Al Macintyre http://en.wikipedia.org/wiki/User:AlMac http://www.ryze.com/go/Al9Mac BPCS/400 Computer Janitor ... see
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