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This clip is suitable for beginners studying PLC. #### I would like to correct the text in the document and the words explaining the time period of 29.05 -33.12 minutes. #### The correct connection is Sink, which is S/S, to connect to +24V and connect one side of the input device wire to negative or 0V and the other side of the wire to X. The Source connection is S/S, to connect to negative or 0V and connect one side of the input device wire to +V24 and the other side of the wire to X. ####### Thank you @Santawan Beer for your comments. If you see any mistakes, please let me know. I apologize for the mistake.