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George Moroses
/ Categories: Infor LX & BPCS Tips, Manufacturing

Infor LX & BPCS Manufacturing Tip of the Week: 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.

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Tips:  LX | BPCS | M3

Just-in-Time (JIT) is a management philosophy that focuses on minimizing the resources necessary to add value to your products and to operate your factory in ways that eliminate waste. Resources are labor, materials, equipment, space, and time. Waste is anything that does not add value to your products. Moving work-in-process from place to place, stacking and sorting, investing capital in large work-in-process and raw material inventories, inspecting materials at your vendors' sites, and tying up warehouse space with finished goods are all activities that add cost, not value, to your products. 

JIT is a process that reduces lead time. JIT does not replace an MRP, an inventory program, a scheduling technique to bypass your Master Schedule, or a materials management project. JIT is the never-ending commitment of everyone, from top management to your workers on the floor, to maximize your effectiveness through continuous, incremental improvements.

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To create and maintain shop orders use SFC500 Shop Order Entry Maintenance. These orders use the standard bill of material (BOM) as the base list of components. You can also set up standard routings, which list the operations,

or work steps, involved in manufacturing.

 

To release shop orders, use the Shop Order Release program, SFC505. Infor ERP LX groups shop orders by user ID for batch processing. Use Shop Packet Print, SFC520, to print the shop orders that you select. SFC530 allows you to create multi-level shop orders to link shop orders together with a common end item parent. Linking multiple shop orders together for a final assembly product provides support for make-to-order and engineer-to-order manufacturing environments which need to schedule these multiple orders together or as a vertical slice in the production schedule.

 

You can make changes to shop orders after you print them. Use Shop Order Entry/Maintenance, SFC500, to update the shop orders. Changes are immediately visible on the inquiry screens for SFC300 and SFC350. To reprint the shop packet, use Reprint Shop Packet, SFC560.

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