https://iopscience.iop.org/article/10.1088/1742-6596/1477/5/052013/pdf

• OEEMAX which functions for OEE monitoring has been developed to be installed on a Raspberry Pi
  • Able to communicate with all types of Programmable Logic Control (PLC) through general-purpose input/output (GPIO) using RS-232 protocol.
• Uses Python and MySQL

Input/output process: