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How to reset a Modicon PLC to Factory setting?

Modicon PLCs like M580 and M340 can be reset to Factory setting using Unity Pro software, that can be achieved as follows
  1. Open Unity Pro software "Start menu -> All Programs -> Schneider Electric -> SoCollaborative -> Unity Pro -> Unity Pro
  2. Open the Unity Pro project which is already running on the PLC or a new created project can be used
  3. Click on PLC menu -> Connect to the PLC in standard mode using a USB cable
  4. Click on PLC menu -> Transfer project to PLC
  5. Interrupt the transfer project process before it is being completed by clicking on cancel button
  6. Notice that PLC status is being changed to no configuration "NO CONFIG"
  7. Click on PLC menu -> Project Backup -> Backup Clear
  8. Click Ok button on the warning message "Potential content of the Backup zone will be erased Do you confirm?"
  9. Restart the PLC
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