Siemens SINUMERIK 840DE sl Commissioning Manual page 937

4. Then choose "OK". If you enter a port for the first time, you will receive a safety note.
Figure 3-3
5. If settings are all done, restart is necessary to activate the new settings. Perform a hardware
restart on the target systems NCU and PPU. A restart of the SINUMERIK Operate is
necessary on the PCU 50.
Checking the HMI time
Make sure that the HMI time is set correctly, since this is a prerequisite for encrypted
communication.
Note
The certificate needed for secure OPC UA communication is automatically created during the
first run-up. The start date of the validity period is set to the current date. The validity period
is 20 years.
If the SINUMERIK system time is subsequently changed, so that it lies outside the validity
period, the secure OPC UA communication does not function (BadCertificateTimeInvalid).
SINUMERIK Integrate for Engineering Access MyMachine / OPC UA
Configuration Manual, 12/2017, 6FC5397-1DP40-6BA1
Security message for opening the TCP port
Setting up of OPC UA server
3.3 Commissioning
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