This video shows us the relation between Programmable Logic Controller (PLC), motor control center (MCC), Local Control Panel (LCP) for controlling a Pump or Motor.
PLC Pump Control Video
MCC : Motor Control Center or Substation where motor will be powered.
PLC/DCS : Control System, where Motor can be controlled as per logic (Auto) or as per operator action (Manual).
LCP : Local Control Panel which is installed in the field, near motor in which start, stop push buttons are available