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Step motors rapidly lose torque with RPM. It is possible that at F600 you are operating on the ragged edge of what your steppers are capable of. That combined with differing friction levels for different directions or positions on you machine due to binding forces, making the machine more prone to loosing steps in one direction vs the other. Stepper motors can be queer and finicky things, and when set up without suitable safety margins, will give troublesome results.

STV is Zero Speed Command and RS is General Lock. Both signals are necessary for the servos.
But I also just see, my question was false. I want to switch signal 19 over the Mesa and ENA. With the old Sinumerik signal 10 (on both amplifiers) is switched with a safety relay and signal 19 (as far as I can see) is switched separately. The 15V is auxiliary voltage from the amplifier. I've already measured this. Therefore I think I can connect 19 to ENAx+ and 14 to ENAx-.

Marc
 
 

Hi frayja2002. I have the same problem. How did you fix the error?
File "upload_config.py", line 7, in <module>
import tftpy
ModuleNotFoundError: No module named 'tftpy'

Looks reasonable.

One thing: never disconnect a stepper motor from the drive with the drive powered up. I don't know for sure that that will blow up a TB6600, but it's definitely not somethng that a TB6560 could survive.