also: シーケンサ · シークエンサー · シークエンサ
sequencer
General term for a device or software that sequences events, often used in music production, DNA analysis, or industrial control.
I made a drum pattern with this sequencer.
programmable logic controller; PLC
In industrial automation, シーケンサー often specifically refers to a PLC. This usage is common in Japanese factories and engineering contexts.
The factory line is controlled by a PLC.