ABB REU 610 Technical Reference Manual page 87

1MRS755972
Voltage Relay
Technical Reference Manual - ANSI Version
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.
Event buffer overflow
DNP 3.0 event buffer overflow is indicated with the internal target 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 the relay. In this case, the relay automatically activates and resets
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.
Collision avoidance and detection
The relay supports both collision avoidance and detection. Collision detection
can be enabled or disabled with SPA parameter 503V235. Collision
avoidance occurs before message transmission. When preparing to transmit
REU 610
87