what mean of PID.vi output?

[xlx2013]

I want use CRIO system to do motor torque PID control,but I don't know

1.what mean of PID output?

this output is a DBL number,how to transfer it into voltage to control motor?

2.how to modify my labview program to do the PID control?

see word document.

[AndyClegg]

In a PID feedback controller you supply a target (the setpoint) and the measurement you want to control (the torque in your case), the purpose of the control is to make the measurement = the setpoint. It does that by calculating the error and passing that through proportional, integral and derivative gains, each control action has a gain that is configured to change the response (e.g. how fast the error is reduced to zero). The three control actions are added together and this is the controller output, this is then becomes the signal you send to your system to make it change - so for a motor it might be the motor current, or some pwm signal, or whatever signal changes the motor torque and can be analogue or an on-off signal - that will depend on your motor and/or drive.

To program a PID control - see some of the LabVIEW examples.