Siemens SIMATIC S7-1500 System Manual page 219

Commissioning
11.9 Time synchronization
Time-of-day synchronization by the system
Time-of-day synchronization between CPU and SINAMICS drives is activated in the TIA
Portal. By default, time-of-day synchronization is deactivated.
Proceed as follows to activate time-of-day synchronization:
1. Select "General" > "Time-of-day synchronization"
2. Select the option "By the system"
Figure 11-3 Time-of-day synchronization
Please note the following in relation to time-of-day synchronization:
● An OB MC Servo must be available and be synchronized with the relevant subnet.
● Frame 39x must be assigned to OB MC Servo and its process image.
● Selecting the "By the system" option switches the drive from operating hours counting to
time-of-day synchronization with the controller.
● The time-of-day synchronization takes place with isochronous ping compensation.
● The first time-of-day synchronization takes place after the SIMATIC Drive Controller has
entered the RUN state.
● Interrupts and alarms before the first synchronization are saved with the valid time stamp
in SINAMICS at those times; all subsequent interrupts and alarms are saved with the
synchronized time. The first time-of-day synchronization after synchronization is activated
is entered in the diagnostic buffer of the drive with the status of the operating hours
counter and the time of day (UTC time, synchronized with SIMATIC Drive Controller).
● If you want to implement time-of-day synchronization through a user program, the option
"By the system" must be deselected.
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SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA