AHLJ

Yes, actually that one possible thought is my case exactly. I have already found that one out. But thank you very much. I am new so it's kind of difficult as everything. But is there any kind of source book for PLC, that you could recommend? Once again thank you for your help.

I only have my push buttons and I have removed the old program from the PLC. I have the led lights near each input and output. I can see the ouput led lights going on when I push the button. So after I push the button my output led light goes on. However, before that I receive the energy from the output... Have tried many things, different wirings. I donot know what might be the problem anymore.

It's just a switch on and off program triggering an output. The problem might be because of wiring or the PLC, it's a bit old. I have been searching but couldn't find anything regarding the wiring manual or instruction... But it's not normal to receive energy from the output before triggering right?

Hello,  I am new with PLC programming. I uploaded a switch on and off program to my PLC to try it. Even though there is no signal the output (Y0) is always on. When I push the button on, the PLC led lights turn on but even before that my lamp is on. I don't know what the problem is, thinking it might be because of the connection.  Thank in advance.