Glossary · System coordination, integration and orchestration
Transfer sequence
Also known as: Handover sequence
German: Übergabesequenz
In industrial automation, a transfer sequence is the defined series of steps by which a workpiece, material or product is handed over from one machine, station or unit to another, including the signals exchanged and the actions each side performs.
- System integration
In one sentence
A transfer sequence is the defined series of steps and signals by which a workpiece or material is handed over between machines or units.
Example
In the transfer sequence between a lathe and a gantry loader, the loader grips the part, the chuck opens, the loader confirms the part is held and moves out, and the lathe closes its door.
How it applies
- Engineering: Describe each transfer as a sequence diagram with steps, signals, feedback and timeouts. Critical moments, such as when both devices hold the part or neither does, need confirmation by sensors rather than timing assumptions.
- Commissioning: Test interruptions at every step (emergency stop, power loss, dropped signal) and define how the transfer is resumed or aborted.
- Operation: Operators need guidance for recovering a transfer that stopped halfway; this is where damage and injuries tend to happen.
- Documentation: Document the sequence in the interface specification shared by both suppliers and describe the recovery procedure in the operating instructions, including safeguarding measures when people must reach into the transfer area.
Transfer sequence vs. machine handshake
A Machine handshake is the signal exchange pattern that coordinates two parties. A transfer sequence is the complete handover procedure, including mechanical actions, of which the handshake is the communication part.