Event Description
MODBUS
Addr
ess
Length Comments
MODBUS Address 30110 1
This indicates the MODBUS register address where the change occurred.
Alarm 30011
Relays 30723
Optos 30725
Protection events – like the relay and opto addresses this will map onto the
MODBUS address of the appropriate DDB status register depending on which bit
of the DDB the change occurred. These will range from 30727 to 30785.
For platform events, fault events and maintenance events the default is 0.
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
fr
om 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 independently clear the stored relay event/fault and
maintenance records. This register also provides an option to reset the device indications, which has the same
effect on the relay as pressing the clear key within the alarm viewer using the HMI panel menu.
6.4.6 DISTURBANCE RECORD EXTRACTION
The IED provides facilities for both manual and automatic extraction of disturbance records.
R
ecords extracted over MODBUS from Px40 devices are 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 IED The data page is made up of 127 registers,
giving a maximum transfer of 254 bytes per page.
The following set of registers is presented to the master station to support the extraction of uncompressed
disturbance records:
MODBUS registers
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
3x00800 No of stored disturbances
Indicates the total number of disturbance records currently stored in the
relay, both extracted and non-extracted.
3x00801
Unique identifier of the oldest
disturbance record
Indicates the unique identifier value for the oldest disturbance record
stored in the relay. This is an integer value used in conjunction with the
‘Number of stored disturbances’ value to calculate a value for manually
selecting records.
Chapter 16 - Communications P24xM
340 P24xM-TM-EN-2.1
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