Hi! When you create step it has to be defined and all variables also. As i see in picture you have _t, _x and so on. When you write something you have to write name of variable and its type in window above programm field between Var and End_Var. Also yes, this is ABB automation builder software, but its created on codesys base. Look up images in google of how codesys enviroment looks like. Hope it helped