Read more discussions : action=display threadid=303 For a little more reading, please download the Chapter HERE. To understand a ladder program, just remember the concept of current flow - a load is turned ON when the current can flow to it and is turned OFF when the current could not flow to it.Ĭhapter 8 in the TRiLOGI Programmer's Reference Guide has a short introductory course on Ladder Logic Programming. The basic purpose of an electrical control system is to determine whether a load should be turned ON or turned OFF, under what circumstances and when it should happen. Ladder logic programs mimic the electrical circuit diagrams used for wiring control systems in the electrical industry.
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