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NO / NC Concept in Ladder Language

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The schematic symbology for switches vary according to the switch's purpose and actuation. A normally-open switch contact is drawn in such a way as to signify an open connection, ready to close when actuated. Conversely, a normally-closed switch is drawn as a closed connection which will be opened when actuated. Any kind of switch contact can be designed so that the contacts "close" (establish continuity) when actuated, or "open" (interrupt continuity) when actuated. For switches that have a spring-return mechanism in them, the direction that the spring returns it to with no applied force is called the normal position. Therefore, contacts that are open in this position are called normally open and contacts that are closed in this position are called normally closed . There is a concept need to remember while using inputs in PLC programming. We can wire both NO or NC inputs to a PLC. These inputs could be pushbuttons, toggle switches, limit switches...
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DOL Starter in Ladder Programming

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What is DOL Starter : Direct On Line Starter is used to start three phase motors below 5 H.P. rating in industries. As the name suggests it connects the motor directly to the line (power supply). Main components of DOL are: -                       #  Push buttons -           #  MCB -           #  Contactor Two push buttons are used, one NO for start operation and one NC for stop operation. MCB is used as a protection device so as in case of any short circuit or over current, it trips and breaks the supply. Major used in a DOL starter is Contactor. Contactor works in similar way as relay works. When coil of contactor is energized its power contacts are closed so as to start the connected motor. Control wiring of DOL starter is shown below: DOL Starter Now if we are making DOL using a PLC, then we can use any button (NO or NC) for any o...
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