Eaton PT 10 Instruction Manual page 41

A.3.4 Event Register
The triggering of an event in the trip unit can provide
historical data object values at the instant in time the event
occurs or occurring around the time of the event. The trip
unit categorizes the event information into classifications
to provide various numbers of each type. Modbus
communication can only have the access to obtain the
historical summary, trip, and alarm event data, as shown in
Table A6.
Table A6. Event Classification
Event Type Number Stored
Historical Summary 200
Historical Trip 10
Historical Alarm 10
A single triggering can place information into multiple event
types. For example, the occurrence of an event triggered by a
circuit breaker trip may provide both historical summary (see
Table A7) and historical trip information (see Table A8).
Access to event information is based on the selection of
event type and event ID. Register 408193 is a R/W register
used to select the event type, using function code 06 or 16 to
write. The event information may be read by using function
code 03 or 04.
When the event type selection is written in register 408193,
the earliest and latest event ID can be obtained in registers
408194 and 408196 respectively to determine the range of
events saved for the selected event type. Register 408198
is a R/W register used to select the requested event ID and
is written with function code 16. If the request event exists
in the trip unit, registers 408200 and 408202 provide the
Previous Event ID and Next Event ID respectively. If the
requested event does not exist in the trip unit, exception
code 0x87 is returned.
The date and time when the requested event happened
is read in registers 408204 through 408211. This value
corresponds to the time of occurrence of the historical event.
Register 408212 stores the selected event type's data
content. This is a constant value for the three event types
that Modbus port supports.
Event data also provides a validity bit for each data object,
starting from register 408213. Bit 0 set to be 1 indicates
that the first data object is valid and bit 1 is used to indicate
the second data object is valid. The number of validity bit
registers is calculated as (number of data objects–1)/16. The
registers listed in Tables A7, A8, and A9 are the data objects.
A request out of the range of the registers address would
result in exception code 02.
Event Register Description
Table A7
Table A8
Table A8 and Table A9
Appendix A - Modbus Communication Port Setting
Table A7. Historical Summary Event
Register Format
408193 Encoded
408194 Unsigned 32
408196 Unsigned 32
408198 Unsigned 32
408200 Unsigned 32
408202 Unsigned 32
408204 Unsigned 32
408212 Date/Time
408213 B0
408214 Encoded
PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn
R/W History Summary Event
R/W Event type: Alarm = 8EFF
16
R Earliest Event ID
R Latest Event ID
R/W Requested Event ID
R Previous Event ID
R Next Event ID
R Date/Time
R Format of Data: 0000 , 0001
16
0004 , 0005 , 0006 ,
16 16 16
R Object Validity Bit
R Event Cause:
00 = Power Up - Time OK
01 = Setpoints Download
02 = Time Adjusted
03 = Trip
04 = Alarm
05 = Enter Test Mode
06 = Exit Test Mode
08 = Power Up - No Time
09 = Test Completed
10 = Inactive
11 = Inactive
12 = Opened by Communications
13 = Closed by Communications
,
16
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