In this lesson, you'll write your own counter logic. The logic you write should turn the 'Output' ON when 'Input $1\text{'}$ has been toggled $3$ times, AND 'Input $2\text{'}$ is OFF. In this case, turning 'Input $2\text{'}$ ON should stop the 'Output' from coming on $($you$\text{'}$ll need to use a normally closed contact for this$).$

The 'Counter $1.$PRE' tag has already been set to $3$ for you, but you'll need to create all of the logic. Feel free to review previous lessons for ideas, but note that when you load a previous lesson your current work will be lost unless you save it$.$ You can save using the button on the 'Other' tab of the toolbox. Clicking the save button generates a unique URL which will always link to the ladder logic which you saved.

Also, while testing you may want to reset the accumulated value in 'Counter $1\text{'}.$ The simplest way to do this is to click the triangle next to 'Counter $1\text{'}$ in the tag list to show the children tags. You can directly change the 'Counter $1.$ACC' value back to $0$ to reset the counter.

After you have tested your logic, make sure 'Input $1\text{'}$ is OFF, then press the Check button to continue to the next course!