CET Electric Technology
54
Chapter 5 Modbus Register Map
This chapter provides a complete description of the Modbus register map (Protocol Version 1.0) for the
PMC-53A-E to facilitate the development of 3
rd
party communications driver for accessing information
on the PMC-53A-E. For a complete Modbus Protocol Specification, please visit http://www.modbus.org.
The PMC-53A-E supports the following Modbus functions:
1)
Read Holding Registers (Function Code 0x03)
2)
Force Single Coil (Function Code 0x05)
3)
Preset Multiple Registers (Function Code 0x10)
The following table provides a description of the different data formats used for the Modbus registers.
The PMC-53A-E uses the Big Endian byte ordering system.
Format
Description
UINT16/INT16
Unsigned/Signed 16-bit Integer
UINT32/INT32
Unsigned/Signed 32-bit Integer
Float
IEEE 754 32-bit
Single Precision Floating Point Number
5.1 Basic Measurements
Register
Property
Description
Format
Scale
Unit
0000
RO
Uan
Float
x1
V
0002
RO
Ubn
Float
0004
RO
Ucn
Float
0006
RO
Uln Average
Float
0008
RO
Uab
Float
0010
RO
Ubc
Float
0012
RO
Uca
Float
0014
RO
Ull Average
Float
0016
RO
Ia
Float
A
0018
RO
Ib
Float
0020
RO
Ic
Float
0022
RO
I Average
Float
0024
RO
kWa
Float
W
0026
RO
kWb
Float
0028
RO
kWc
Float
0030
RO
kW Total
Float
0032
RO
kvara
Float
var
0034
RO
kvarb
Float
0036
RO
kvarc
Float
0038
RO
kvar Total
Float
0040
RO
kVAa
Float
VA
0042
RO
kVAb
Float
0044
RO
kVAc
Float
0046
RO
kVA Total
Float
0048
RO
PFa
Float
-
0050
RO
PFb
Float
-
0052
RO
PFc
Float
-
0054
RO
PF Total
Float
-
0056
RO
Frequency
Float
Hz
0058
RO
Uan/Uab (3P3W) Angle
Float
°
0060
RO
Ubn/Ubc (3P3W) Angle
Float
°
0062
RO
Ucn/Uca (3P3W) Angle
Float
°
0064
RO
Ia Angle
Float
°
0066
RO
Ib Angle
Float
°
0068
RO
Ic Angle
Float
°
0070
RO
In (Calculated)
Float
A
0072
RO
I4
1
Float
0074
RO
Displacement PFa
Float
-
0076
RO
Displacement PFb
Float
-
0078
RO
Displacement PFc
Float
-
0080
RO
Displacement PF Total
Float
-