ABB REU 610 Technical Reference Manual page 83

1MRS755769
Voltage Relay
Technical Reference Manual
Depending on the pulse type, either the date-to-minute or the date-to-second
*
information of the DNP time synchronization message is used.
The relay sends only one request for time synchronization to the DNP master,
*
which is at power up.
Unsolicited reporting startup
Due to implementation differences in DNP master devices, the following alternative
unsolicited reporting ( SPA parameter 503V24) startups are available in the relay:
1 = Unsolicited reporting starts immediately, without permission from the master.
*
2 = The relay sends an empty unsolicited response message when
*
communication begins, which the master confirms. After this, the relay starts
to send unsolicited responses.
3 = The relay sends an empty unsolicited response message when
*
communication begins, which the master confirms. After this, the master
enables unsolicited reporting for certain or all classes using function 20. Classes
which are not enabled remain disabled.
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 uses the
following SPA parameters, called send throttle parameters:
Class 1 Event delay
503V18
Class 1 Event count
503V19
Class 2 Event delay
503V20
Class 2 Event count
503V21
Class 3 Event delay
503V22
Class 3 Event count
503V23
Example:
(class 1)
The events are reported when the event delay ( SPA parameter 503V18) has
elapsed or the defined amount of events ( SPA parameter 503V19) are
generated for class 1.
If send throttles are not wanted, the event delay should be set to 0 and the
event count to 1. In this case, the class events are sent to the host immediately
as they occur.
REU 610
83