Push to ON PUSH to OFF PLC program using NO NC and Coil

بِسْــــــــــــــــمِ اﷲِالرَّحْمَنِ اارَّحِيم

bismillaahirrahmaanirrahiim

السَّلاَمُ عَلَيْكُمْ وَرَحْمَةُ اللهِ وَبَرَكَاتُهُ

Assalamu'alaikum warahmatullahi wabarakatuh

This is  Interview question that every PLC programmer came across in his carrier.The Question is very tricky and shows the fundamentals (basic Ladder Laws) and depth of candidates knowledge.


Today we are going to discuss PLC program for Push to ON device  and Push to Off Device.But the trick is that we have to use  only Normally open(NO) ,Normally Close (NC) contacts ,and Coil as output only(No timer,Counter, OSR ). In short there will be a single Push Button Input (X0) , and one Output (Y0). When user press Push button for 1st time output will be ON ,when user Presses Push Button for 2nd time output will be OFF. This is also called as "Push to On Push to Off " logic.Analogy can be provided with "TV" on and off Push Button. 

  We Can Break Sequence Like This :

1) Push Button Pressed (X0) ==> Output (Y0)On

2)Push Button Released (X0)==> Output (Y0) Latched

3)Push Button Pressed (X0)==> Output (Y0 )Off

4)Push Button Released (X0)==> Output (Y0) Off

Remember you can write PLC program in number of ways 

•  Using only NO,NC,Coil only
• Using Counter
• Using Pulse Instruction
• Using OSR (Rising Edge ,Falling Edge) Instruction

 below program is using NO,NC,Coil

Note:Do not Replace M0 with Y0

Below Program is using Counter instruction

Below Program is using PLS instruction

More Question asked on this are related to Scan time and rung interchange etc.

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ٱلْحَمْدُ لِلَّهِ رَبِّ ٱلْعَٰلَمِين

Alhamdulilah hirobil alamin

وَ السَّلاَمُ عَلَيْكُمْ وَرَحْمَةُ اللهِ وَبَرَكَاتُهُ

wassalamualaikum warahmatullahi wabarakatuh

Artikel Push to ON PUSH to OFF PLC program using NO NC and Coil, Diterbitkan oleh scodeaplikasi pada Kamis, 12 April 2012. Semoga artikel ini dapat menambah wawasan Anda. Website ini dipost dari beberapa sumber, bisa cek disini sumber, Sobat diperbolehkan mengcopy paste / menyebar luaskan artikel ini, karena segala yang dipost di public adalah milik public. Bila Sobat tertarik Ingin membuat software, membeli software, membeli source code ,Dengan Cara menghubungi saya Ke Email: Fajarudinsidik@gmail.com, atau No Hp/WA : (fajar) : 085369237896, (puat) : 085267792168.