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 failur
e
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.
4x00250
Manual disturbance record
selection register
This register is used to manually select disturbance records. The values
written to this cell are an offset of the unique identifier value for the
oldest record. The offset value, which ranges from 0 to the Number of
stored disturbances - 1, is added to the identifier of the oldest record to
generate the identifier of the required record.
4x00400
Record selection command
register
This register is used during the extraction process and has a number of
commands. These are:
b0: Select next event
b1: Accept event
b2: Select next disturbance record
b3: Accept disturbance record
b4: Select next page of disturbance data
b5: Select data file
3x00930 - 3x00933 Record time stamp These registers return the timestamp of the disturbance record.
3x00802 No of registers in data page
This register informs the master station of the number of registers in the
data page that are populated.
3x00803 - 3x00929 Data page registers
These 127 registers are used to transfer data from the relay to the master
station. They are 16-bit unsigned integers.
3x00934
Disturbance record status
register
The disturbance record status register is used during the extraction
process to indicate to the master station when data is ready for
extraction. See next table.
4x00251 Data file format selection
This is used to select the required data file format. This is reserved for
future use.
Note:
Regist
er addresses are provided in reference code + address format. E.g. 4x00001 is reference code 4x, address 1 (which is
specified as function code 03, address 0x0000 in the MODBUS specification).
The disturbance record status register will report one of the following values:
Chapter 18 - Communications P14x
434 P14xEd1-TM-EN-1
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