2711-PK4M20A A-B Relay Input Module
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The logic you enter into the micro controller makes up a ladder program. A ladder program consists of a set of instructions used to control a machine or a process. Ladder logic is a graphical programming language based on electrical relay diagrams. Instead of having electrical rung continuity, ladder logic is looking for logical rung continuity. A ladder diagram identifies each of the elements in an electromechanical circuit and represents them graphically. This allows you to see how your control circuit operates before you actually start the physical operation of your system.In a ladder diagram each of the input devices are represented in series or parallel combinations across the rung of the ladder. The last element on the rung is the output that receives the action as a result of the conditional state of the inputs on the rung.Each output instruction is executed by the controller when the rung is scanned and the conditions on the rung are true. When the rung is not scanned or the logic conditions on the rung do not create a true logic path, the output is not executed. The programming device allows you to enter a ladder logic program into the micro controller. In the following illustration, the electromechanical circuit shows PB1 and PB2, two pushbuttons, wired in series with an alarm horn. PB1 is a normally open pushbutton, and PB2 is normally closed. This same circuit is shown in ladder logic by two contacts wired in series with an output. Contact I/0 and I/1 are examine–if–closed instructions.➀ (For more information on this instruction, refer to page 6-4.)
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