既然P2271=0动作正常，那就说明反馈信号方向这时是对的。
MM440(430没试过)的PID不管是否使能（使用）都是在线（运算）的。当你不能确认反馈信号方向是否正确时，就可以关掉PID（P2200=0）后，检查反馈信号的方向，然后决定P2271=0/1。
Notice:
It is essential that you select the correct tranducer type.

If you are unsure whether 0 or 1 is applicable, you can determine the correct type as follows:
1. Disable the PID function (P2200 = 0).
2. Increase the motor frequency while measuring the feedback signal.
3. If the feedback signal increases with an increase in motor frequency, the PID transducer type should be 0.
4. If the feedback signal decreases with an increase in motor frequency the PID transducer type should be set to 1.