That would depend of what accuracy you want, by putting "TPWrite ...maybe \Num:= ainput(aiCurrent_M)" it does display the value in the tp but the question is when this will happen during the process and if it is relevant to you, for example putting it after the ArcL the instruction will be evaluated some time before reaching the largest zone if that is what you want great.
If you want to keep track of how the value changes during the whole path you could create another task to keep track of TCP position and AI value, starting after the weld stable feedback signal, save it to a text file and open in excel for example, plot in a graph etc.
attaching the manual for system parameter, look into chapter 4 it explains better about LogMax Phmax and LogMin and other possible parameters.
What you can do is create a Screenmaker application with the details you wish to show on the screen while the Robot is busy welding. Here's a screenshot of the one I made for my system a while back.
I've found that with TPWrite & TPPrint, that if you try and write something too fast you'll get some errors and then you have to put some WaitTime instruction in to give the system time to write.
