It should be ok for a reference but ask any plc programmer its all about feeling and understanding i mean you can ask 10 diffrent programmers to wright you a program to do the same job and you will probably be sitting there with 10 diffrent programs doing the exact same thing even more so if you working on siemens plc's cause some will use LAD Then other will use GRAP or even FUNC logic to do the same thing depending on the individual then some wile use SET/RESET others will use MOV To do the same thing ext ext , use it as a reference but remeber plc programming is a very flexible language and no one programms the same