I want to buy and use Siemens S7-1200 PLC.
But there are so many models inside the 1200 PLC family that is confusing for a beginner.
I am just using a sensor which works on both AC/DC.
How do I make my selection?
If you expand the controller and click on a part number it will give you a detailed description of what the plc has (I/O, work memory, etc.)
If it is true all you are using is a sensor then you may want to go with a less expensive CPU 1211C or something similar. But you should look at the description and see if it suits your needs.