Siemens SIMATIC S7-1500 System Manual page 217

Commissioning
11.9 Time synchronization
Changing the IP addresses of the NTP servers with the "T_CONFIG" instruction
For the CPU, you can change the addresses of up to four NTP servers during runtime with
the T_CONFIG instruction.
Requirement: You have configured at least one NTP server in STEP 7. Even if you have only
configured one NTP server, you can save up to four NTP servers in the T_CONFIG
instruction.
Proceed as follows to change the IP addresses of the NTP servers with the T_CONFIG
instruction:
1. Save the IP addresses for the NTP servers in a tag of the data type IF_CONF_NTP.
2. Interconnect the tag of the data type IF_CONF_NTP at the block parameter CONF_DATA
of the T_CONFIG instruction.
3. Call the T_CONFIG instruction in the user program.
Result: The addresses of the NTP servers from the T_CONFIG instruction are transferred to
the CPU. The NTP server addresses configured in STEP 7 are overwritten.
You can change the addresses of the NTP servers with T_CONFIG more than once if
necessary.
Additional information
For additional information on time-of-day synchronization - time synchronization, refer to the
following FAQ on the Internet
(https://support.industry.siemens.com/cs/de/en/view/86535497).
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SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA