7350 can have a loop rate of 62ms for 2 axis independently control. However, even for one axis only, it cannot be looped in 31ms.
There is 2 chips, DSP & a microprocessor, plus FPGA for motion control, on the 735x/734x motion controller.
There will be no resolution for a single motion controller card. Resolution depends on the Motor, the encoder resolution, and support by Motion control module.
i.e. PMAC's motion "Set" may provide minimum displacement of 2.5 nm with specific motor.
John L.