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5. DNP3 Ethernet Communication Setup Configuration Utility
PXM 4/6/8K DNP3 Ethernet Communications User Manual
MN150005EN January 2017 www.eaton.com
3. Link Layer Confirmation Time Out
It is the time duration between two successive DNP
link layer frames in case of link layer retries from the
PXM meter. The range for this parameter is 100 mS to
30,000 mS.
It is the time duration for which the PXM meter will
wait before attempting retransmission of the link layer
frame if the link layer confirmation message is not
received from the DNP master.
4. Link Layer Time Out
It is the maximum amount of time to wait for a com-
plete frame after receiving valid frame sync characters.
The range for this parameter is 10 mS to 60,000 mS.
5.3.3 DNP Time Sync
It may be required to synchronize the DNP master and the
PXM meter real time clock (RTC). This parameter is configu-
rable and has options as explained below.
1. Time Synchronization Type
●
●
None
There will be no time synchronization between
the DNP master and PXM meter. The PXM
meter shall never set the time sync flag in IIN
bytes.
Figure 11. Time Synchronization Type Page
●
●
Interval
The PXM meter will periodically set the time
sync flag to request time synchronization to
match the time/date of the master.
When the time sync flag is set by the PXM
meter, it is up to the DNP master to achieve
time synchronization by sending a time write
request to the PXM meter. When time sync
is successful, the PXM meter shall clear the
time sync flag in it IIN bytes and shall restart
a timer. Duration of the timer will be decided
by the “Interval” parameter. Once this timer
elapses, the PXM meter will again set the time
sync flag in it IIN bytes. This will indicate to the
DNP master that the PXM meter is requesting
time sync and it will repeat the procedure as
explained above.
This frequent time synchronization makes sure
that time in the DNP master and PXM meter is
same.
2. Time Synchronization Interval
It is amount of time in seconds the PXM meter will
wait before setting a time sync flag after the successful
clearing of time sync flag.