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REF 610
100
Feeder Protection Relay
Technical Reference Manual
Unsolicited reporting start up
Due to implementation differences in DNP master devices, the following alternative
unsolicited reporting (SPA parameter 503V24) start ups are available in REF 610:
• 1 = Unsolicited reporting starts immediately, without permission from the master.
• 2 = REF 610 will send an empty unsolicited response message when
communication begins, which the master will confirm. After this, REF 610 will
start to send unsolicited responses.
• 3 = REF 610 will send an empty unsolicited response message when
communication begins, which the master will confirm. After this, the master will
enable unsolicited reporting for certain or all classes using function 20. Classes
which are not enabled remain disabled.
Note!
Only the last alternative is compliant with the DNP 3.0 standard.
Event handling
The maximum capacity of the DNP event buffer is 100 events. When unsolicited
reporting has been enabled (SPA parameter 503V24), the event reporting will use
the following SPA parameters, called send throttle parameters:
503V18
Class 1 Event delay
503V19
Class 1 Event count
503V20
Class 2 Event delay
503V21
Class 2 Event count
503V22
Class 3 Event delay
503V23
Class 3 Event count
Example (class 1)
The events will be reported when the event delay (SPA parameter 503V18) has
elapsed or the defined amount of events (SPA parameter 503V19) have been
generated for class 1.
If send throttles are not desired, the event delay should be set to 0 and the event count
to 1. In this case, the class events will be sent to the host immediately as they occur.
Event buffer overflow
DNP 3.0 event buffer overflow is indicated with the internal indication IIN2.3, as
defined by the standard. IIN2.3 can also indicate event buffer overflow in the
internal communication between the DNP3.0 module and the main CPU module of
REF 610. In this case, REF 610 will automatically activate and reset the IIN2.3 bit.
As events have been lost in both cases, the DNP 3.0 master should perform an
integrity scan after the IIN2.3 bit has been reset.
DNP counters and frozen counters
DNP counters in use have a corresponding frozen counter. The frozen counters in
object group 21 have the same DNP point index as the ordinary DNP counters.
Further, frozen counters can only be read as static objects, and frozen counter events
(object group 23) are not supported.
1MRS 755310
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