PLC Source Sink Study Cards
Study each of the 7 PLC Source Sink training Cards.
This interactive "PLC Source Sink Slideshow" has 30 second delay on each card so you can study. So even after narration, the card may stay visible for a few more seconds.
Each PLC Source sink slide remains visible for 30 seconds to give you time to review. Use your navigation to play audio narration, tap the black dots to restart, or select one study card to review again. The start/stop links control playing and pausing the automatic switch to the next card. Below is a link back to the PLC Source Sink Home page when you're finished, so you can proceed to the next interactive training in the series.
Key points made in this sink-and-source lesson.
Slide 1:
- A PLC DC Source Input card is a PNP device, meaning a sensor connected to the source input card will be an NPN device.
- A PLC DC Sink Input card is an NPN device, meaning a sensor wired to the sink input card will be an NPN device.
Slide 2:
- The PLC DC Source Output card, a PNP device, controls the positive relay connection.
- A PLC DC Sink Output card is an NPN device that controls the negative relay connection.
Slide 3:
- A DC source (PNP) is the most positive. A DC sink (NPN) is the most negative.
Slide 4:
- DC devices have a diode that allows current to flow in only one direction. Like a check valve does for fluid.
Slide 5:
- Electronic devices have transistors in them. Transistors have built-in diodes.
Slide 6:
- A DC source input card needing a transistor input would need an NPN transistor.
Slide 7:
- You can wire electromechanical switches with no electronics as a sink or a source.
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