T01 M06 vs. M06 T01

[sinha_nsit]

Are these two exactly same, or there might be some difference depending on parameter setting / ladder design?

[Boots]

They are not exactly the same and may not work on the same machine. On most Fanuc Controls I have used you can call a tool up by simply T01; the tool will come to the tool change position and wait for the M06 command. when you are ready to change tools in the program all you need is an M06;
I always call the tool up ahead of time so it is ready. Makes the tool change happen much faster.

[underthetire]

depends on if random style ATC or umbrella style.

[Boots]

True I forgot to mention that. With Random you can call up tool ahead of time.