Functions and usage of d registers, 1 overview of d registers, 2 configuration of d registers – Yokogawa PR300 Power and Energy Meter User Manual
Page 110: 3 interpretation of d register map table, Overview of d registers -1, Configuration of d registers -1, Interpretation of d register map table -1, Data format abbreviations
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<7. Functions and Usage of D Registers>
7-1
IM 77C01E01-10E
7.
Functions and Usage of D Registers
7.1
Overview of D Registers
This section describes the functions and usage of D registers.
The D registers store the input values, statuses, and others that are handled by the
PR300. By connecting the PR300 to higher-level device capable of PC link commu-
nication, Modbus communication, or Ethernet communication, you can readily use
these internal data items by reading from or writing to the D registers.
7.2
Configuration of D Registers
Description
D0001 to D0100
Process data (measurement data)
Electric energy, instantaneous value and status
D0101 to D0200
Process data (statistics data)
Maximum value and minimum value
D0201 to D0300
Parameter data
Setup conditions such as VT ratio and CT ratio
D0301 to D0400
Control data
Control of operations such as remote reset
Register No.
Classification
Cannot be used. Writing to this area is not guaranteed.
Prohibited area (blank)
Other
7.3
Interpretation of D Register Map Table
This section explains how to read the D Register Map tables in this chapter. The
numbers listed in the leftmost column are D register numbers ((1) below). The five-
digit numbers in the next column are reference numbers used for Modbus communi-
cation ((2) below). The numbers in the column third from left are register numbers in
hexadecimal used in Modbus communication programs ((3) below).
H No.
Register
Symbol
Register Name
Effective Range
Initial
Value
Back-
up
R/W
D-Reg
No.
Ref
No.
0 to 99,999,999 [kWh]
(1) D register number
(2) Reference number (for Modbus communication)
(3) Hex number (for Modbus communication)
Register symbol
Register name
Effective (setting) range and unit
Initial value
Backup of data
᭹
Backed up at instantaneous
power failure
᭺
Backed up at setting
✕
With no backup
Permission of read/write by communcation
R: Read/W: Write
An asterisk (*) in this column
indicates that the number of writing
action is limited to 100,000 times.
D0001
40001
0000
kWh L
Active energy (uint32, lower 2 bytes)
R
D0002
40002
0001
kWh H
Active energy (uint32, upper 2 bytes)
–
●
᭺
Data Format Abbreviations
float: single precision floating decimal point
uint: without sign integer
int:
with sign integer