How to Make Start Stop Logic in PLC using Different NO-NC Combination

This Tutorial Will teach you how to use NO and NC for making Start stop logic. For this we understand that you have basic knowledge of No and NC . You can also learn Basic of PLC here.

To make start-stop logic you just have to write a simple program in PLC. In Electrical it is possible to make start – stop logic with a NO start push button and NC stop push button BUT in PLC you can make start-stop logic with any combination of start and stop push button.

Let us understand ……..

**PB- Push Button, NO – Normally Open, NC – Normally Closed**

1> Start PB – NO , Stop PB – NC



2> Start PB – NO , Stop PB – NO



3> Start PB – NC , Stop PB – NO




4> Start PB – NC , Stop PB – NC




Source:-http://www.automation-talk.info/2010/07/how-to-make-start-stop-logic-in-plc.html