Here I review some of the features and specifications of commonly
used discrete panel-mounted controllers. A review of all makes and
features is impossible here, so to supplement this column, my best
advice is, extend your reading to catalogs, operation manuals, FAQs and
web sites of the top manufacturers. With product knowledge in your
brain and an eye on your process, you can make a sound and economical
DIN means Deutsches Institut fur Normung (German Institute for Standardization). It has pioneered many industrial standards, and those for rectangular panel instruments have gained worldwide adoption, aiding interchangeability and reducing panel fabrication costs.