Time-Of-Day Synchronization Of An S7-400 Cpu - Siemens SIMATIC TIM 3V-IE DNP3 System Manual

Format of "Status"
The status of the time information is available in the four bits of the low nibble of byte 8. The
following table shows the meaning and the values of the status.
Table 5- 2
Bit No.
Meaning
Value
Initial setting of the time
The user program that reads out the time on the CPU should only do this when the validity
bit is set. This is the case as soon as the TIM is synchronized the first time, either by the time
master in the DNP3 network or by the PG.
Note
If the time on the TIM was set from a PG, this is always indicated as standard time (status
bit 1 has the value "0").
5.9.3

Time-of-day synchronization of an S7-400 CPU

Time information provided by the TIM 4R-IE DNP3
If a TIM 4R-IE DPN3 in stand-alone mode is connected to a master station via Ethernet and
an S7-400 CPU is connected to the second Ethernet interface, the TIM can synchronize the
time of day of the CPU. The TIM synchronizes the S7-400 CPU using SNAP messages.
The parameters for time-of-day synchronization are set in the properties dialog of the TIM in
the "Time Service" parameter group:
● The synchronization cycle is set on the Ethernet interface connected to the master
station. The TIM automatically obtains the time-of-day from the master station computer.
● The second Ethernet interface that is connected to the S7-400 CPU is set to
"Synchronization master".
The S7-400 CPU must be configured in the "Clock" parameter group as a slave.
TIM DNP3
System Manual, 12/2015, C79000-G8976-C253-04
Status bits of the time (low nibble of byte no. 8)
3
Prewarning bit
0 = -
1 = prewarning:
Changeover at the
next full hour
(DS -> ST or ST -
> DS)
5.9 Configuring time-of-day synchronization
2
Not defined
Daylight saving
time (DS), standard
time (ST)
0 = ST
1 = DS
Configuration in STEP 7
1 0
Validity of the time
0 = invalid
1 = time valid
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