Multiple Event Records Reading - ABB Relion 620 Series Protocol Manual

Section 3
Vendor-specific implementation
3.4.9.4
54
Table 32: Interpretation of the ACD data
Register address
49261
49262
Table 33: Interpretation of the SEC data
Register address
49261
49262
The original SEC cnt attribute is actually defined as a 32 bit counter. The Modbus
event shows the least significant 16 bits of that counter, that is 0...65535.

Multiple event records reading

It is possible to read out up to 10 sequential event records in one event select/read
transaction. The number of sequential event records to be returned for reading shall be
written to the Num of records register (49250) in front of the selection register. This
number can be written once or it can be rewritten for each select/read transaction. If
this number is never written, only one event record is returned.
If the Modbus client requests multiple event records, the returned records should also
be read out by the client. One record consists of 11 registers, two records of 22
registers and so on. The read length must thus be adjusted depending on the number
of records requested.
The selection/read operation is otherwise exactly similar to the single-record read
case. The next records to be returned always continues from the last record in the
previous read operation.
Reading out more event records than are available in the internal event
buffer
The requested amount of event records is always returned for reading. For example,
if 10 event records are requested, but the IED only contains five event records, the last
valid event record is repeated (duplicated) in the last five event records returned. The
Meaning
xxxx.xxxx.xxxx.xxx0 Object in OFF position
xxxx.xxxx.xxxx.xxx1 Object in ON position
xxxx.xxxx.xxxx.xx00 Start in unknown direction
xxxx.xxxx.xxxx.xx01 Start in forward direction
xxxx.xxxx.xxxx.xx10 Start in backwards direction
xxxx.xxxx.xxxx.xx11 Start in both directions
Meaning
xxxx.xxxx.xxxx.x000 Unknown security violation
xxxx.xxxx.xxxx.x001 Critical security violation
xxxx.xxxx.xxxx.x010 Major security violation
xxxx.xxxx.xxxx.x011 Minor security violation
xxxx.xxxx.xxxx.x100 Warning
Security violations counter, 16 bits
Communication Protocol Manual
1MRS757645 B
620 series