APARIAN A-DNP3R, Руководство пользователя

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DNP3 Operation
Document No. D109-010 Page 70 of 108
Revision 1.15
notified and must execute the requested command. This is done by having a Freeze Counter
Control UDT which can be used by the Logix controller to take the needed action.
NOTE: The Control Tag must be named identical to that of the DNP3 Counter
Tag used with the addition of “Ctrl” suffix. For example if the DNP3 Counter
tag being used is named
ErrorCounter then the Freeze Control Tag must be
named ErrorCounterCtrl for the freeze command to operate correctly. The
user must also ensure that the dimensions of the two tag arrays are the same.
The Counter control will use the AparianDNP3CounterCtrl UDT as shown below:
Figure 5.8 – Freeze Command Pair
Figure 5.9 – Outstation Mapping
The Control Tag will either have the Freeze bit or Freeze and Clear bits set to indicate to the
Logix controller that the counter values must be copied to the DNP3 Frozen Counter Group
tags and if the Counter must be cleared afterwards. Refer to the Logix Example code for an
example of how this is done. The time of occurrence is the DNP3 time (Unix time in
milliseconds) when the freeze command was received. This must be copied to the DNP3
Frozen Counter Group tag as well.
Figure 5.10 – UDT for freeze command