Uses and properties of the TIM
1.8 Message memory of the TIM for events
TIM DNP3
26 System Manual, 12/2015, C79000-G8976-C253-04
Message memory of the TIM for events
Message memory for events
Note
Reducing the size of the message memory
The
overall size of the message memory can be configured and can be reduced. Since the
transmission of several thousand events via connections with a low transmission speed
(modem) takes a relatively long time, a reduction may be practical.
The TIM saves the data messages (including the time stamp) of data points that are
configured as an event. This reduces the data loss if disturbances occur on the
communications path or if a partner fails.
Size of the message memory:
● TIM 3V-IE DNP3: 64 000 events
● TIM 4R-IE DNP3: 200 000 events
If you use a backup battery in the TIM 4R-IE DNP3, events are retained even if there is a
power outage. On return of power, the connected DNP3 master stations can read these
events.
If there are several DNP3 master stations connected, the available message memory of a
station is divided up according to the number of master stations.
Time synchronization
Options for time-of-day synchronization of DNP3 stations
The system time of the station TIM of a DNP3 station can be set in two ways as described
below:
● Time-of-day synchronization using DNP3 mechanisms
● Time-of-day synchronization with NTP (Network Time Protocol)
(for TIM 4R-IE DNP3 only)
Note
Avoiding time-of-day inconsistencies
N
ote the following points relating to time-of-day synchronization:
Make sure that only one subscriber ever operates as the time-of-day master in a DNP3
network.
Make sure that only one of the methods of time-of-day synchronization listed below is
used.
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