emailed question: Sink and Sourcing

[Chris Elston]

Below is the result of your feedback form. It was submitted by Kelly S. F. (kflannery1003@yahoo.com) on Monday, August 16, 2004 at 10:49:08 --------------------------------------------------------------------------- comments: Could you explain the terms sinking and sourcing and how they are related to plc's, and how they relate to npn pnp, or just refer me to a good place to get this info. Thanks. K.Flannery. P.S. Any good magazines dedicated to plc's,control panels?

[Chris Elston]

Here are Two downloads: Terry Woods: http://forums.mrplc.com/index.php?act=Downl...&CODE=02&id=150 Numatics: http://forums.mrplc.com/index.php?act=Downl...&CODE=02&id=141 That should give you a good idea. Magazines? There is one called "Control Engineering" That isn't too bad.