Setup times are fixed, quantity-independent times incurred for the preparation of a machine or a workplace for a manufacturing task – regardless of whether 10 or 1,000 units are subsequently produced. In SAP Business One, they influence both lead time and manufacturing costs and are a key lever for lot size decisions and capacity planning.
Context and meaning
The correct consideration of setup times is crucial for realistic capacity planning and accurate costing of manufacturing costs. If they are ignored or underestimated, immediately noticeable knock-on effects occur: actual throughput times are underestimated, Production plans are suboptimal, delivery dates are jeopardised and calculated product costs distort profit margins.
Setup times also increase overhead costs per batch — the smaller the batch, the greater the proportion of setup time per unit. They are therefore a key factor in determining economical batch sizes and in deciding how to group production orders.
Master data prerequisites
- Resources (ORSC): Set-up times are mapped via resources. Each machine or workstation that requires set-up time should be defined as a resource – configurable under Module → Administration → Definition → Production → Resources. For the armour itself, either a dedicated „armour resource" can be created or a specific process can be defined within an existing resource.
- Time unit and cost price In the master data for resources, the unit (hours, minutes) and the hourly rate must be recorded – cost accounting is not possible without these values.
- Production bill of materials (OITT/ITT1): The setup resource is stored as a component of Item Type „R" in the bill of materials for the finished item. The quantity corresponds to the required setup time (e.g. 2 hours).
- Fixed quantity per order Crucially, the marking as „Quantity per order" — this way, the set-up time is charged exactly once per production order, regardless of the number of units produced. Without this setting, the set-up time would be calculated per unit – a common and costly configuration error.
Route planning and stages
In more complex manufacturing processes, setup times can be incorporated as a separate stage or as part of a stage in the production order (WOR4 — Process Sequence). This allows for sequential planning and separate feedback for setup operations, which is useful, for example, when several different setup operations follow each other in a production chain, or when setup times are performed by qualified personnel before the actual machine run.
Transaction logic in the production order
- Create order (OWOR): When creating a production order via Module → Production → Manufacturing Order Will the setup resource from the bill of materials be transferred to the order? The planned setup time is factored into the total throughput time and the planned costs.
- Status transitions The setup time is part of the „Planned" and „Released" times. It is ideally recorded before the actual production process.
- Feedback The actual setup time is recorded either via manual material withdrawal of the setup resource or via feedback of resource consumption. This directly impacts the actual costs of the order.
MRP and capacity planning
Of the MRP Assistant (Module → MRP → MRP Assistanttakes into account the resources stored in the bills of materials and their consumption times, including setup time, as part of the total throughput time. This directly influences the suggested start and end dates for production orders.
For the Capacity planning Are setup times particularly tricky? They burden the resource just as much as the actual production. A large number of small batches with long setup times can dramatically reduce available capacity – and is the classic path to a bottleneck. The fixed time blocks per order must be explicitly considered in planning, otherwise an apparent availability will be created that does not exist in reality.
Optimising batch sizes
Set-up times are the crucial factor in determining optimal batch sizes. The larger the batch, the more units share the fixed set-up time — the Setup costs per unit sink, efficiency increases. At the same time, however, larger batches lead to higher storage and capital tie-up costs. The economic optimum is reached where the sum of setup costs and storage costs reaches a minimum – classically depicted in the Andler formula (Economic Order Quantity).
Practical tip
Check at each resource in the bill of materials explicitly whether the quantity is designated as „Quantity per order" or „Quantity per piece" is defined. Incorrect configurations are one of the most common costing errors in the SAP B1 production environment – and they only become apparent when either the manufacturing costs are implausibly high (for small batches) or the throughput time becomes unrealistic for large batches. Setup times should always be assigned to „Quantity per Order", and variable processing times should always be assigned to „Quantity per Piece".
Demarcation
Setup times are not Processing times — these grow proportionally with the production volume, while setup times are incurred independently of the batch size. They are also to be distinguished from Downtime or Transit times, which are also factored into the overall runtime, but do not represent an active resource load. Similarly, they are to be distinguished from Maintenance and cleaning times Outside of a specific order: These belong to general machine availability, not to order-related availability. calculation.
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