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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Programmable Logic Controller
   PLC
      <hardware> (PLC) A device used to automate monitoring and
      control of industrial plant.  Can be used stand-alone or in
      conjunction with a SCADA or other system.
      (1997-02-11)