scheider electric MiCOM P746, Technical Manual

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P746/EN SC/G31 SCADA Communications
(SC) 13-
20
MiCOM P746
SC
Event
Description
MODBUS
Address
Length Comments
Event Index 30111 1 This register will contain the DDB ordinal for
protection events or the bit number for alarm
events. The direction of the change will be
indicated by the most significant bit; 1 for
0 – 1 change and 0 for 1 – 0 change.
Additional Data
Present 30112 1 0 means that there is no additional data.
1 means fault record data can be read from
30113 to 30199 (number of registers depends
on the product).
2 means maintenance record data can be read
from 30036 to 30039.
If a fault record or maintenance record is directly selected using the manual mechanism then
the data can be read from the register ranges specified above. The event record data in
registers 30103 to 30111 will not be available.
It is possible using register 40401(G6 data type) to clear independently the stored relay
event/fault and maintenance records. This register also provides an option to reset the relay
indications, which has the same effect on the relay as pressing the clear key within the alarm
viewer using the front panel menu.
3.6 Disturbance record extraction
The relay provides facilities for both manual and automatic extraction of disturbance records.
The extraction mechanisms are explained below:
3.6.1 Description
Records extracted over MODBUS from Px40 platform relays will be presented in
COMTRADE format. This involves extracting an ASCII text configuration file and then
extracting a binary data file.
Each file is extracted by reading a series of data pages from the relay. The data page is
made up of 127 registers, giving a maximum transfer of 254 bytes per page.
3.6.1.1 Interface registers
The following set of registers is presented to the master station to support the extraction of
uncompressed disturbance records:
MODBUS Register Name Description
3x00001 Status register Provides the status of the relay as bit
flags:
b0 – Out of service
b1 – Minor self test failure
b2 – Event
b3 – Time synchronization
b4 – Disturbance
b5 – Fault
b6 – Trip
b7 – Alarm
b8 to b15 – Unused
A ‘1’ on b4 indicates the presence of a
disturbance.