The “NOR” gate on PLC contacts. Logic Circuits, 14/101

If you already know the “OR” from the video #9 of the "Binary and Logic Circuits" playlist, the NOR should be easy, as it only adds an inverter to the OR output.

In order to appreciate its value in diagrams, I included an application of what we call “negative logic” of the NOR function.

The electric diagram looks extremely simple, two contacts in series.
The tricky thing though is, that both contacts are normally closed – NC – so if you watch the page attached in the google drive folder, you can see how this connection unfolds into a NOR function.

Here are the folder with 3 files attached:
NOR_gate_description.pdf ,
Examples of NOR gate packages.pdf,
NOR_vs_AND_connection.pdf :

https://drive.google.com/drive/folder...

Thanks for watching and CU next Tuesday!