Siemens SIMATIC TIM 3V-IE DNP3 System Manual page 125

● Preselection time [s]
The time value specifies the maximum time between command preselection and
command input in seconds (select before operate). If the command is not input within the
specified time after the command preselection by the operator in the master station, the
command must be selected again. Having to enter the command twice reduces the risk of
accidental operation in the master station.
Possible values: 1 ... 255
Default: 5
If a master station sends an object with the control code "DIRECT_OPERATE", the
"Preselection time" for the received object is not evaluated in the station.
The following objects are always sent by the master station with the control code
"DIRECT_OPERATE": Bin08X_S (12), Cmd01B_S (12), Par12D_S (41), Set01W_S (41)
● Transmission mode
This parameter specifies the order in which the DNP3 events are transmitted to the DNP3
master station.
Possible values:
– Type-specific
– Chronological
Default: Type-specific
"Connection properties data link layer" box
● Frame repetitions
The parameter specifies the maximum number of repetitions at the data link layer. On
serial connections, repetitions may be useful if the connection quality is not good. On
Ethernet connections, the value 0 is configured here because any necessary repetitions
are handled by the protocol implementation.
Range of values: 0 ... 255
Default: 0
TIM DNP3
System Manual, 12/2015, C79000-G8976-C253-04
This is the bundled transfer of events according to data types typical for DNP3. First,
the existing binary events are sent then all analog values and finally all counted value
changes. This makes the messages somewhat more compact and transmission more
efficient.
In this mode, events are transmitted strictly chronologically. The optimizing effect of
grouping in blocks of the same data type as described in the DNP3 specification (see
above) is lost. This mode is primarily intended for control systems that archive events
strictly chronologically.
Configuration in STEP 7
5.7 Configuring TIM modules
125