Ladder Wiring Diagram. 1 a ladder diagram translates similarly to a book. These numbers are the rungs in which the contacts can be found.
Rail and rung construction of ladder diagram. The ladder diagram consists of two power rails which are placed vertically on each side of the diagram and rungs which are placed horizontally between the power rails the power rails are the source of power in the circuit ac or dc where the left rail is the hot side voltage and the right rail is neutral ac or ground dc. Line diagrams provide a fast easy understanding of the connections and use of components.
Convention 1 the vertical lines of the diagram represent the power rails between which circuits are connected.
The ladder diagram consists of two power rails which are placed vertically on each side of the diagram and rungs which are placed horizontally between the power rails the power rails are the source of power in the circuit ac or dc where the left rail is the hot side voltage and the right rail is neutral ac or ground dc. The programmable controller was designed to replace physically small control relays that make logic decisions but are not designed to handle heavy. Chapter 6 developing fundamental plc wiring diagrams and ladder logic programs electromagnetic control relays the plc s original purpose was the replacement of electromagnetic relays with a solid state switching system that could be programmed. In drawing a ladder diagram certain seven conventions are adopted.
