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9 Modbus RTU – integrated Modbus port specification
9.3 Modbus register map
52
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01/21 MN012005EN
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9.3.1 Input status (discrete inputs)
The input status bits 101001 to 101032 can be accessed via function
code 02. The statuses are de
fi
ned in
→
table 23.
The first 16 bits (1001 to 1016) indicate the current status, while the last
16 bits (1017 to 1032) indicate whether the corresponding status is valid.
Table 23: Input status
9.3.2 Real-time data object register
Data that are subject to real-time changes, such as current, voltage and
power, are displayed in
Real-time data can be obtained either in IEEE floating-point or fixed-point
format. For data displayed in fixed-point format, each result is presented as a
multiplication of the real-time data with a scaling factor. Energy objects can
only be obtained in fixed-point format (FP).
Registers for which the IEEE floating-point value is not specified are only
supported in fixed-point format.
Each data object occupies two registers (4 bytes), with the exception of
certain energy objects. These energy objects in question occupy four
registers (8 bytes). As these objects can be changed in real time, the
complete data object must be obtained in a single transaction to avoid any
“data cracks”. Any attempt to access a partial data object will return the
exception code 04.
Input
Description or value
Input
Description or value
1001
The breaker is in the closed position
1017
The breaker is in the closed position and is valid
1002
Unacknowledged trip condition
1018
Unacknowledged trip condition is valid
1003
Active or unacknowledged alarm
1019
Active or unacknowledged alarm is valid
1004
0
1020
0
1005
Maintenance mode is active
1021
Maintenance mode is active and valid
1006
Test mode is active
1022
Test mode is active and valid
1007
0
1023
0
1008
0
1024
0
1009
0
1025
0
1010
Overload mode is active (an overload is present)
1026
Overload mode is active and valid (an overload is present)
1011
Zone selectivity (ZSI) is active
1027
Zone selectivity (ZSI) is active and valid
1012
0
1028
0
1013
0
1029
0
1014
0
1030
0
1015
0
1031
0
1016
0
1032
0
→
For more information on the exception codes, see
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