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George Moroses

Infor LX & BPCS Manufacturing Tip: Backward Scheduling

Operations are automatically backward scheduled at shop order release time. The backward scheduling algorithm starts with the shop order due date and schedules each operation based upon the standard move and queue times in the routings and the number of days the job is expected to run at standard. The system calculates and stores the operation scheduled start date. The dates may be modified by the shop order maintenance program. The number of days that a job is expected to run an operation is dependent upon the available capacity for that work center and the total hours scheduled for that operation.

The backward scheduling algorithm also considers the shop calendar for weekends, shutdowns, holidays, and partial days. Backward Scheduling Process The algorithm starts with the due date of the shop order or planned order. The system makes the following calculations for each operation in the reverse sequence:

1. The number of move days is subtracted from the due date (or initial date of the previous operation) to get the due date for this operation. The move days are only used on valid shop calendar days.

2. The system uses the following calculation for the number of clock hours for the operation: Standard run or machine hrs/No. of operators + setup hours

3. The number of clock hours is spread over the available daily capacity of the work center for those given days. The system uses the following calculation for the daily capacity of the work center: Number of shifts x hours per shift x average efficiency/100

4. Each day is checked against the shop calendar; the calculation bypasses inactive days or adjusts for any changes in the work center capacity for that day.

5. Queue time days are subtracted in the same manner as move time days. The resulting date is the operation start date.

The algorithm then goes to the previous operation. When all operations have been included, the resulting date is the scheduled start date of the shop order. Note that MRP uses the item lead time to determine material requirement dates on planned orders.

Backward scheduling is supported in all shop order release programs (SFC500, SFC550, and FAS510). Backward scheduling is recalculated if a shop order is maintained through SFC500 when the due date or the required quantity is changed; however, you cannot enter move and queue times through the maintenance program when adding an operation to the shop order.

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Tips:  LX | BPCS | M3

Did you know that you can set up one-time vendors in LX? One Time Vendor (1,A): Specify Y to indicate that this vendor is a one-time vendor. Otherwise, could you specify N. The system removes a one-time vendor's information from the Vendor Master file after all transactions are reconciled. If this vendor already exists as a one-time vendor, you can specify N to change the vendor to a regular vendor.

Determining whether to use Master Production Schedule (MPS) planning or Material Requirements Planning (MRP) planning for items in Infor LX and BPCS involves understanding the nature of the items and their demand characteristics.

Master Scheduled Items typically encompass finished goods or service items. These items receive their requirements either from Independent demand, Dependent demand, or a combination of both...

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Tips: LN | Baan

One common GRINYA issue would be incorrectly entered Integration Setups.

Check the Baan/LN manual for recommended Integration setups. If such a mistake were to occur, it is important to know for what period of time the Integration was in error. It is recommended that the Integrations Setup tables be audited either through Baan or Database Auditing. Corrections can be quickly calculated when an exact timeframe can be determined.

In LN, you can differentiate between items at various suppliers:

  • Locations (warehouses),
  • Purpose (planning, purchase)
  • Origin (supplier, warehouse)

Example

An item is supplied by two different suppliers. Supplier A ships in lots of 100 pieces due to how the item is packed. Supplier B ships the goods in units of 60 pieces.

You can define specific parameters for each supplier. The following sessions can be used to define these characteristics:
 
  • Items - Planning (cprpd1100m000)
  • Check Item Data by Warehouse (whwmd2210m000)
  • Item Supplier Plan (cpvmi0530m000)
These sessions define entities that have an n-to-1 relationship with the general item data.

 

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