Alim, A.T.S. and Sudiarto, B. 2023. Economic analysis of variable speed drive control through profinet technology on distributed control system: A case study in essential oil processing factories. Jurnal Pendidikan Teknologi Kejuruan. 6, 2 (May 2023), 129-138. DOI:https://doi.org/10.24036/jptk.v6i2.32123.