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George Moroses

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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George Moroses

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Tips:  LX | BPCS | M3

Role-Based Security introduces Role type profiles and allows combining the use of Role profiles with the traditional LX User type security profile functionality. The new Role type profile can be defined to allow or deny access to All Products, Attention Key, Products, Programs, and Transaction Effects. Facility, Warehouse, and Company securities are still defined solely by the User profile settings and are not affected by the assignment of a Role. Where applicable, the Role authority is displayed alongside the User authority on the security profile maintenance screens making it easy to see where there are differences in authority between the User and the assigned Roles. 

When Users are assigned to Roles, security access in LX becomes a combination of authorities granted or denied by the Role, plus any User Exceptions. User Exceptions override authorities set by the Roles. A User can also be assigned to more than one Role.

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Tips: LN | Baan

In Baan IV, requirements for an MPS item with the order method lot-for-lot result in daily planned MPS orders.

For example, if a plan period contains 10 working days and the net requirements for an item in that period is 2000 pieces, an MPS planning run generates one planned MPS order of 200 pieces for each working day in the plan period.

In Infor LN, requirements for a planned item with the order method lot-for-lot result in one planned order per plan period.

For example, if a plan period contains 10 working days and the net requirements for an item in that period is 2000 pieces, a master planning run will generate a single planned order of 2000 pieces for the first working day in that plan period. To influence the order quantity of the planned orders, enter appropriate values in the Maximum Order Quantity field and the Order Interval field in the Items – Ordering (tcibd2500m000) session or choose a fixed order quantity.

If Location Control is turned on in Baan IV, then inventory should never be negative.

If Location Control is not turned on in Baan IV, and the parameter “Negative Inventory Allowed” in INV Parameters is set to “NO”, then inventory should never be negative.

In Baan V and LN, the parameters in Inventory Handling Parameters determine whether you can have negative inventory. If these parameters are set to “NO”, then inventory should never be negative.

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