Hate to burst your bubble. This block is called from FB20 and is, most likely "Protected" by the manufacturer. If you drag your mouse over the box and right click, select "Open Block" and it will attempt to open. My guess is you will get "Block Protected" It appears this is a function written for a German built printing press. They are well known for using "Know_How_Protect" to seal the functions to protect the warrenty and to keep people from modifying their code. This block is the control block for one unit on your press and can be used as many times as you have units. If it opens, the declaration area will be on the top of that block and will have the text seen that generates the "Handles" on the block call in FB20. BTW, there is also a DB# Data Block associated with each call to the Function Block. You may open that online and look at what data values are passed through the FB.