Automation : PLC And the Ladder Diagrams


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Courtesy : EEP

This article demonstrates ladder logic in PLC.

PLCs hardwired in panelboard (Curtesy of Richmond Engineering Works)

The ladder diagram has and continues to be the traditional way of representing electrical sequences of operations. These diagrams represent the interconnection of field devices in such a way that the activation, or turning ON, of one device will turn ON another device according to a predetermined sequence of events.

Figure 1 – Simple electrical ladder diagram

Full article at EEP.

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