TS EN 62381

TS EN 62381 is the standard for handling Factory Acceptance Test (FAT), Site Acceptance Test (SAT), and Site Integration Test (SIT) activities in process industry automation systems. It provides a common framework for proving that an automation system conforms to the stated specification, while also noting that the detailed test activities may be adapted to the specific needs of the process, plant, or equipment. In practical terms, it is a reference for structuring acceptance and integration verification around automation projects.

How FAT, SAT and SIT differ in practice

FAT is typically performed in the supplier’s or integrator’s environment before shipment or site deployment, where the system can be checked in a controlled setting. SAT focuses on confirming that the installed system performs as intended under site conditions. SIT addresses the broader integration question: whether the automation system interacts correctly with other systems, subsystems, and interfaces within the plant. Together, these stages help distinguish component-level readiness from overall system and interface readiness.

What this edition says about the document set

• The standard defines procedures and specifications for FAT, SAT, and SIT.
• It states that these tests are carried out to demonstrate conformity with the specification.
• The described activities may be used as guidance and adapted to the requirements of the process, plant, or equipment.
• This second edition replaces the 2006 first edition and is described as a technical revision.
• The document notes that the definitions of documents mentioned in the standard align with future IEC 62708.