Essential Knowledge for Beginners: Key Differences Between PLC Ladder Diagrams and Relay Circuits
Today, digital control technologies represented by PLC ladder diagrams are gradually replacing relays, which are products of the “bicycle era,” akin to “cars on the highway.” Although PLC ladder diagrams visually mimic the symbols of relay circuit diagrams (such as contactors, coils, etc.), their control logic has shifted from the “hardwired connections” of physical wiring … Read more
