http://ecmweb.com/archive/basics-ladder-logic 12 Nisan 2016 tarihinde Wayback Machine sitesinde arşivlendi. "Ladder logic uses switch or relay contacts to implement Boolean expressions. In years past, ladder logic was made possible with discrete relays and was sometimes termed “relay logic."
http://ecmweb.com/archive/basics-ladder-logic 12 Nisan 2016 tarihinde Wayback Machine sitesinde arşivlendi. "Ladder logic uses switch or relay contacts to implement Boolean expressions. In years past, ladder logic was made possible with discrete relays and was sometimes termed “relay logic."
