Eaton PT 10 Instruction Manual page 33

Table A3. Real Time Data
Register Number. Register Addresses (HEX)
IEEE Float Fixed Point (FP) IEEE Float
404977 406513 1370
404979 406515 1372
404981 406517 1374
404983 406519 1376
404995 406531 1382
404997 406533 1384
405009 406545 1390
405011 406547 1392
405013 406549 1394
405015 406551 1396
Energy objects can be obtained in two-register, fixed point
data format and four-register encoded format. Floating point
data format is not supported.
The two-register format is presented in units of kilowatt-
hours. The four registers encoded energy object occupies
Register 3 through Register 0. Register 3 is the high order
register and Register 0 is the low order register. Register 3
high byte contains value corresponding to engineering units
(power of 10 signed exponent). Register 3 low byte contains
a mantissa multiplier value (power of 2 exponent). Register 2
through Register 0 contains a 48-bit energy mantissa in units
of watt-hours. The data format of four registers is shown in
Figure A1.
Figure A1. Four-Register Energy Data Format.
Objects
Fixed Point (FP) Descriptions
1970 Test Trip count
1972 Open by Comm count
1974 Manual Open count
1976 Time of Last Operation (Year, Month, Day, Hour, Minute, Second)
1982 Max Device Temperature
1984 Time of Max Device Temperature (Year, Month, Day, Hour, Minute, Second)
1990 Running Time: Minute
1992 Running Time: Hour
1994 Running Time: Day
1996 Breaker health life point
Appendix A - Modbus Communication Port Setting
A.3.3 Setpoints Register
The trip unit's setpoints are organized into groups. Each
group can be considered a binary array of information which
can be obtained through Modbus register access. Register
403001 is a R/W register used to select the particular group.
The high byte contains the requested group number, while
the low byte must contain 255 (FFW). The setpoints register
can be read using function code 03 or 04. Register 403001
can be written using function code 06 or 16. For trip units
which support write setpoint capabilities, the setpoints
should be written one by one using function code 06. Before
reading or writing the setpoints, register 403001 should be
written to choose corresponding group.
Group 0 is the system group, listed in Table A4. Group 1 and
5 are the protection groups, listed in Table A5.
PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn
FP Data
Units Factor
1
1
1
1
ºC 1
1
1
1
1
1
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