REG 316*4 1MRB520049-Uen / Rev. E ABB Switzerland Ltd
9-9
9.3. Transferring disturbance recorder data via the IBB
Disturbance recorder data (records) can be read and transferred
via the SPA bus with the aid of the EVECOM program. Further
details are contained in the Operating Instructions for EVECOM.
The data are made available in the EVE format when transfer is
requested. Data transfer is controlled using the SPA BUS vari-
ables V20, M28, M30, M31, V16 and V17.
V20:
Write: WV20:1 starts the transmission of a telegram.
Read: RV20 returns the number of disturbance recorder
records available.
V17:
Write: WV17:1...5 determines the compression factor, i.e.
1%...5%.
Read: RV17 returns the compression factor.
Compression reduces the number of periods that have to be
transferred per channel. Assuming the 12 points of a period de-
viate by less than the specified compression factor from the cor-
responding points of the preceding period, the points themselves
are not transferred, but simply the number of repeats in relation
to the preceding period. For example, if a record consists of 100
periods all the same, then only the 12 points of one period and
the number of repeats are transferred. Compression is applied
independently for each individual channel.
M28:
Write: WM28:n selects a disturbance recorder record for
transfer. n has a value between 1 and the number
of records that that can be read using RV20. The
conversion of the record to the EVE format starts
and the first response is NAK. WM28:n has to be
repeated until the response is ACK. (From firmware
V4.0.)
Read: RM28 returns the directory information, time stamp
and record number.
1995-05-10 12.34;23.423 RE001.001
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