Glossary · Engineering, integration and validation
Site acceptance test (SAT)
Also known as: SAT
German: Abnahme vor Ort (SAT)
In automation projects, a site acceptance test (SAT) is the test of an installed machine or automation system at the customer's site to show that it works as specified in its real environment, with its real utilities, interfaces and process. Passing the SAT is often a contractual milestone for handover.
- Validation
- Standards
In one sentence
A site acceptance test (SAT) checks an installed machine or automation system at the customer's site against the specifications before handover.
Example
During the SAT, the palletizer runs with real products and the customer's warehouse system, and the agreed performance is measured over one shift.
How it applies
- Commissioning: The SAT follows installation and commissioning. It repeats selected FAT tests and adds those that depend on the site: field wiring, utilities, interfaces to other systems and real products. IEC 62381 describes FAT, SAT and site integration test (SIT) for process industry automation systems.
- Project management: Acceptance criteria and the handling of open points are agreed in advance; the signed SAT protocol often triggers handover and payment.
- Quality: Results are recorded in a Test protocol, with deviations and their resolution.
- Documentation: The handover package usually includes the as-built documentation. The documentation team should make sure manuals reflect the configuration accepted at the SAT.
SAT vs. FAT
The Factory acceptance test (FAT) is performed at the supplier's premises before shipment; the SAT at the customer's site after installation. A passed SAT confirms agreed functions; it does not replace the manufacturer's risk assessment or the owner's own obligations.