Our PLC training customer sometimes ask for us to clarify PLC source and sink I/O. So we put together a free online PLC Source Sink Course at http://bin95.com/university/
This powerpoint is one part of the free online course, it also have 4 free online interactive training modules (one is an interactive game), a free online PLC Source Sink quiz, and a video. Between all 7 elements of this course, one should have a great understanding of PLC sinking and sourcing inputs and outputs and the devices connected to them.
Please like, follow and share this powerpoint in its entirety to encourage us to make more free online PLC training courses. Thanks