Siemens Simatic ET 200SP Manual page 243

Measured value data records
E.5 Measured value data record for maximum values with time stamp (DS 154)
Structure of time stamp
The table below shows the structure of the time stamp:
Byte
0
2
4
8
The start value (initial value) is 01.01.1970, 0:00
Note
If you use the FAQ from the section Time-of-day synchronization and time stamp (Page 53),
the status is always 2.
242
PN Time
Status
0: Synchronization from system time
master available
1: local synchronization available
2: no synchronization
Seconds high
Seconds low
Nanoseconds
Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
Format
UINT16
UINT16
UINT32
UINT32
Manual, 07/2018, A5E42674880-AA
Length
2 bytes
2 bytes
4 bytes
4 bytes