You start at the top left of the print and proceed down the page reading from left to right. Usually the schematic is laid out in the sequence of operation.
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It is a horizontal line of ladder logic.Ladder logic is a language used to program PLC's.It's called Ladder Logic because the programs are formed in the shape of a ladder. Each horizontal line in the program looks like the "rung" of a ladder, which is why they call it Ladder Logic.
Wiring diagrams are graphical representation of the electrical wring of a device or system. It is the documentation of the electrical system.
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The best way to do this is to find the diagrams. Do a quick image search to find the information that you need.