Configuration in STEP 7
5.7 Configuring TIM modules
TIM DNP3
System Manual, 12/2015, C79000-G8976-C253-04
121
When an Ethernet interface is selected, you will see the following parameters:
●
Send Keepalives for Connections - Interval [s]
Range of values: 0...65 535
This parameter specifies the interval in seconds at which keepalives are sent. If the value
is set to 0, no keepalive messages are sent.
For connections via mobile wireless networks, a value of 120 seconds is recommended.
The keepalive interval should always be shorter than the interval for "dead peer
detection" (DPD) on the connected router.
●
Keepalive monitoring time [s]
Range of values: 0...255
Default: 0
This parameter specifies the monitoring time in seconds when sending a keepalive. An
acknowledgement of the message just sent must arrive within the monitoring time defined
here.
If the TIM does not receive an acknowledgement, the TIM outputs an error message to
the diagnostics buffer.
If the value is set to 0, the default value (1 second) is used on the TIM.
In mobile wireless networks, a message is normally acknowledged within a few seconds.
This may take longer depending on the load on the network. Experience has shown that
an "Ethernet timeout" of 10 seconds is practical in wireless networks.
Note
For the influence of the "Master station monitoring time" parameter on the "Keepalive
timeout" parameter, see below.
●
You can set the Ethernet interface as follows:
–
Select this setting if the station is connected to a SIMATIC S7-400/400H via the
selected interface.
The S7 connection is then created automatically in NetPro.
–
Select this setting if the TIM is the DNP3 master station or a node station and the
selected interface is connected to the lower-level stations.
–
Select this setting if the station is a node station and the selected interface is
connected to the higher-level DNP3 master station.
–
Select this setting if the station is a DNP3 station and is connected to the DNP3
master station via the selected interface.
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