ABB Relion 620 Series - Single Event Record Structure; Single Event Record Reading

buffer the different clients are reading at the moment. Clients are identified either by
the serial port from where the requests are issued or by the client's IP address in the
TCP/IP network. Up to 25 different IP addresses, belonging to both registered and
unregistered Modbus clients, can be memorized by the IED.
3.4.9.1 Single event record structure
The Modbus event record structure is located at addresses 49251...49262.
Table 26: Event record structure
Address Register Values Comment
49251 Event selection 1...4 and -1...-499 Write register
49252 Sequence Number 0...65535
49253 Unread records left 0...499
49254 TimeStamp
(Year,Month)
High byte:year, low byte:month
49255 TimeStamp (Day,
Hour)
High byte:day, low byte:hour
49256 TimeStamp (Min, Sec) High byte:min, low byte:second
49257 TimeStamp
(Milliseconds)
Word: milliseconds (0...999)
49258 Event type See separate description
49259 Data Object ID 1 0 or UID high word See separate description
49260 Data Object ID 2 Modbus address or UID low
word
49261 Data Value Modbus data value Value into which object has
changed
49262 Data Value Additional data
The event record can have two different data object identification alternatives. The
data object can be identified by the Modbus address on which the object resides or it
can be identified by a unique id which is platform dependent.
The identification alternative is selected with the Modbus parameter Event ID.
3.4.9.2 Single event record reading
As long as there are unread Modbus events available for the Modbus client in
question, bit 0 of Modbus SSR3 register remains "1".
Events are read in two steps. First, the client writes a selection code to the Event
selection register at location 49251. The selection code defines the type of read
operation that the client wants to perform. The selected event record is loaded by the
IED into the following 11 registers from 9252 to 9262. Second, the client reads out the
11 registers in one multiple register read operation.
1MRS757645 B Section 3
Vendor-specific implementation
620 series 49
Communication Protocol Manual