USS parameter read error

s27

does anyone have any ideas?

+ Wiring is extremely important for USS
+ The USS address only takes hold after a power cycle of the V20

Work harder to formulate your situation and you may get more helpful responses.
I recommend ShareX to create screen captures quickly. Share a ZIP with the images.

Below is a link that has an application example. Two more are linked within. One of the three also contains hardware level instructions and drive settings. Compare what you are doing different.

Simple Control of a SINAMICS V20 with a SIMATIC S7-1200/1500 via USS

Good luck.

A very quick search of these forums came up with this: https://support.industry.siemens.com/tf/WW/en/posts/s7-1200-uss-protocol/260581

Perhaps that can help.

Do you prevent sending additional data requests or writing new data while the USS send is BUSY?

If not, you really need to avoid trying to send new data while the old data is still in the process of being sent.

You may need to come up with a way to queue up read / write requests, or use a library (maybe Siemens has a USS library that you can use to simply send and receive data and it handles everything for you... worth a look?).

s27

does anyone have any ideas?