the data has been read, the event record can be marked as having been read by writing a value of '2' to
register 40400.
9.5.2 MANUAL EVENT RECORD EXTRACTION
There are three registers available to manually select stored records and three read-only registers allowing
the number of stored records to be determined.
● 40100: Select Event
● 40101: Select Fault
● 40102: Select Maintenance Record
For each of the above registers a value of 0 represents the most recent stored record. The following
registers can be read to indicate the numbers of the various types of record stored.
● 30100: Number of stored records
● 30101: Number of stored fault records
● 30102: Number of stored maintenance records
Each fault or maintenance record logged causes an event record to be created. If this event record is
selected, the additional registers allowing the fault or maintenance record details will also become populated.
9.5.3 RECORD DATA
The location and format of the registers used to access the record data is the same whether they have been
selected using either automatic or manual extraction.
Event Description
MODBUS
Address
Length Comments
Time and Date 30103 4 See G12 data type description
Event Type 30107 1 See G13 data type description
Event Value 30108 2
Nature of value depends on event type. This will contain the status as a binary flag
for contact, opto-input, alarm, and protection events.
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 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 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.
Chapter 7 - SCADA Communications MiCOM P747
212 P747-TM-EN-1
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