relay was the type of control system logic that plc ladder logic replaced.
relay was the type of control system logic that plc ladder logic replaced.
what type of control system logic did plc ladder logic replace?
relay
ladder logic has evolved into a programming language that represents a program by a graphical diagram based on the circuit diagrams of relay logic hardware. ladder logic is used to develop software for programmable logic controllers (plcs) used in industrial control applications. the name is based on the observation that programs in this language resemble ladders, with two vertical rails and a series of horizontal rungs between them. while ladder diagrams were once the only available notation for recording programmable controller programs, today other forms are standardized in iec 61131-3 (for example, as an alternative to the graphical ladder logic form, there is also a more assembly language like format called instruction list within the iec 61131-3 standard.).
ladder logic
as microprocessors have become more powerful, notations such as sequential function charts and function block diagrams can replace ladder logic for some limited applications. some newer plcs may have all or part of the programming carried out in a dialect that resembles basic, c, or other programming language with bindings appropriate for a real-time application environment.









































section::::see also.









































bullet::::- digital circuit









































bullet::::- iec 61131









































bullet::::- structured text









































section::::external links.









































bullet::::- ladder logic tutorial for beginners









































bullet::::- beginners ladder logic primer









































bullet::::- basic ladder logic









































bullet::::- "chapter 6: ladder logic" by tony r. kuphaldt









































bullet::::- patterns of ladder logic programming
ladder logic