Understand Lot behavior and queuing
- Last UpdatedApr 15, 2025
- 2 minute read
As lots move through a piece of equipment, the LotBehavior property on the equipment specifies the queuing behavior of material lots.
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First In, First Out (FIFO) |
An equipment item with FIFO behavior processes new transaction requests from quantities in the lots with the earliest timestamps. |
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Last In, First Out (LIFO) |
An equipment item with LIFO behavior processes new transaction requests from quantities in the lots with the latest timestamps. |
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Selective |
An equipment item with Selective behavior removes lots from the equipment by selection; that is, lots can be removed in any order they are selected. |
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Mixed |
An equipment item with Mixed behavior does not track lot history. Movement of a lot to this type of equipment is the last link in the genealogy of the lot. |
Explaining FIFO and LIFO behavior for Lots
The following two examples illustrate the behavior when moving lots in and out of work centers with either the FIFO lot-queuing behavior or the lot-queuing LIFO behavior.
Example 1: Lot queuing behavior in FIFO work centers
In this example, the work center has a lot behavior of FIFO. When a request for a transaction arrives, the material is processed from lots with the earliest timestamp first. AVEVA Production Management keeps moving to the next lot in the queue until the requested quantity is satisfied. In this case 300 units are requested. AVEVA Production Management moves 200 units from Lot 1 and 100 units from Lot 2 to satisfy the transaction request.
Example 2: Lot queuing behavior in LIFO work centers
In this example, work center has a lot behavior of LIFO. When a request for a transaction arrives, the material is processed from lots with the most recent timestamp first. AVEVA Production Management keeps moving to the next lot in the queue until the requested quantity is satisfied. In this case 400 units are requested. AVEVA Production Management moves 100 units from Lot 4, then 200 units from Lot 3, and 100 units from Lot 2 to satisfy the transaction request.
