10/17/2023 0 Comments A plc ladder logic program consists of a number of rungs with each rung controlling an inputPLC Basics: The History of PLCsĪ circa 1970s relay rack, usually found in automobile plants or other large scale industrial complexes, consisted of a large 2 dimensional array of relays placed in a grid pattern, often on multiple 4ft x 8ft sheets of plywood. These racks of relays were numbered in some fashion, usually top to bottom and left to right like spreadsheet cells. ![]() This was invented because a Programmable Logic Controller was designed to replace something called a relay rack. ![]() ![]() PLCs in North America are usually programmed in a graphical language called ladder logic. PLCs are unusual devices in the way that they operate. ![]() Following up “The Basics of a PLC”, read here PLC Basics: learn about the history of PLC’s, how PLC’s have traditionally worked, and how they work today.
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