To Old Fighter:
Yes. You are right according to the Manual, Ver. 10/03. It wrote in the Manual that Cstat for both P1501 and P1300 are CT. That is why I posted the question here. However, practically P1501 can be changed via BICO, even when drive is running. That is true. You can try that when you have chance.
I still believe that the definition for P1501 in Manual is reasonable and should be followed. In my opinion, improper application of switching Speed/Torque Control using P1501 may cause problems even injury, although it's still not very clear in my mind. Some more internal logics may be needed in the Drive to ensure switching Speed/Torque Control safely.
By the way, I am now wondering about what the difference is in the world between direct and indirect selection of Torque Control using P1300 and p1501, except recognization of OFF1 Command.
Sorry for late reply.