Siemens SIMATIC ET 200SP System Manual page 222

Configuring NTP server in STEP 7
To configure one or more NTP servers for the ET 200SP CPU, follow these steps:
1. In the Inspector window, navigate in the properties of the CPU to "General" > "PROFINET
interface" > Time synchronization".
2. Enter the IP addresses of up to four NTP servers at the parameters "Server 1" to "Server
4".
3. Set the interval of the time queries at the "Update interval" parameter. Set the update
interval to between 10 s and 86400 s.
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.
Requirements: You have configured at least one NTP server in STEP 7. Even if you have
configured only one NTP server, you can enter 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. Enter the IP addresses for the NTP servers in a tag of data type IF_CONF_NTP.
2. Interconnect the tag of 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.
If necessary, you can change the addresses of the NTP servers several times with
T_CONFIG.
Reference
For additional information on time synchronization in the automation environment, refer to
the following FAQ on the Internet
(https://support.industry.siemens.com/cs/de/en/view/86535497).
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
Commissioning
11.10 Time synchronization
221