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@jonsequitur : 

@diegoErol The SINUMERIK ONE use a S7-1500. The NCK is almost the same so far. (4.9x 6.xx) You write that you have problems with NC-VAR. This has nothing to do...

I also have this problem with the current NCK version. I will do some tests to see if the problem is on our side or again in the Siemens firmware....

Looks like the NC close the connection after each read request.

I have contacted Siemens and they have confirmed that this is a fault. I was offered a workaround which I would like to test. At the same time, Siemens wants...

Siemens will fix this Bug with CNC Version 6.22 HF3

I tried the new firmware CNC Version 6.22 HF3 and can confirm that the bug is fixed.