How to SET and RESET a coil in Fatek PLC programming Winproladder

In the PLC ladder logic programming, usually we need to latch the output coil from just one push button signal. If we use a simple coil contact in the output of a NO (normally open) contact, this input will energize the output coil when input get a signal. When we stop supplying signal to the input normally open contact, the coil will also be stop.

Sometime, we need to latch a coil just supplying one pulse signal to normally open input contact, there are two methods we can use to latch a coil.

• By using SET function.
• By using NO (normally open) of coil, to latch it.

Here, we are going to learn SET and RESET a coil. SET means when this coil will experience an input signal, coil will be SET (energized/latched) until we supply another input to RESET this coil. This means, first we use an input contact (normally open) which is like a push button, and in the output, we will use a SET coil. Now when we press push button, (NO) normally open contact will start flowing to the coil (SET Coil) and it will SET this output coil.


Also Read: How to Download & Install Fatek PLC WinProladder Software Free


Now, we have to use a RESET coil to reset this coil from another input source. This is very simple. Let's start using SET and RESET function in WinProladder.

SET & RESET A Coil In Fatek PLC Programming Winproladder

Firstly, place a normally open contact (NO) and name it "X0" which is out input number 1. In the output side, place a SET Coil function and name it “Y0” which is output number 1 we have in Fatek PLC programming, as shown below.

This is we have placed a SET coil in our output. This means when "X0" will get a input signal, "Y0" will be energized. Now we will use a RESET command to reset this coil. To reset this coil now, we have to use another input normally open contact, and a reset contact, see below.

In the above picture, you can see that I placed another input, which will be our stop push button, by pressing this "Y1" push button, the coil "Y0" which we set above in the first network, will be reset.

This is how we use SET and RESET functions in PLC programming to set and reset a coil. Please write below is anything you are not getting about SET and RESET in Fatek PLC programming.