Dear zyzz!
I apreciate too much your answer and I will use your comments to help me in future projects, also I will study this subject deeply to as soon as possible bring to this Thread more information and examples.
Thank you for your help!
Cesar.
Dear xyzz!
I think I must clarify my question a litle bit more.
Let's forget about the plc type or manufacturer.
Let's think about the customer point of view only regarding about the field device, if you can agree with me. Then in this case, why choose between an NPN or PNP imput technicaly...
Dear Railroaded!
I think you can use a project you know, for example, and start with this process. So get it and cut it if necessary for, I mean, if the project is too much big. Ok. Then think about your needs or ideas, never start with a big idea.
Imagine something simple. Of course, the...
