Siemens SIMATIC TIM 3V-IE DNP3 System Manual page 124

Configuration in STEP 7
5.7 Configuring TIM modules
"DNP3 Basic Parameters" tab
"Transmission settings" box
● Unsolicited transfer
The parameter specifies whether or not event messages from a station TIM can be sent
spontaneously to the DNP3 master station.
Range of values:
– No:
– Yes:
Default: No
If the option is enabled on the station TIM, this sends a query to the master station TIM. If
the option is disabled on the master station TIM, the master station TIM sends a control
message (DISABLE_UNSOLICITED) with the information that the sending of unsolicited
messages by the station is not permitted and the station TIM saves the events without
sending them.
To achieve a consistent configuration you should select the same setting for the
communicating interfaces of the station TIM and master station TIM.
Note
If the TIM interface is connected to a serial DNP3 dedicated line with the type of
connection "half duplex", you will need to set the "Unsolicited transfer" parameter to "No".
To avoid collisions, you should also set the parameter to "No" when connected to full
duplex multidrop dedicated lines.
● Repetition of spontaneous messages
This parameter specifies how often spontaneous messages are repeated if transmission
is disrupted. On serial connections, repetitions may be useful if transmission is not always
reliable. On Ethernet connections, the value 0 is generally configured because any
necessary repetitions are handled by the protocol implementation.
Possible values: 0 ... 255
Default: 0
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No unsolicited (spontaneous) messages are sent.
The station TIM can send spontaneous messages.
System Manual, 12/2015, C79000-G8976-C253-04
TIM DNP3