CARLO GAVAZZI EM 21 Handbuch zum Kommunikationsprotokoll - Seite 7
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Energy management
2.1
Data format representation In Carlo Gavazzi instruments
The variables are represented by integers or floating numbers, with 2's complement notation in case of
"signed" format, using the following:
Format
IEC data type
INT16
INT
UINT16
UINT
INT32
DINT
UINT32
UDINT
UINT64
ULINT
IEEE754 SP
For all the formats the byte order (inside the single word) is MSB->LSB. In INT32, UINT32 and UINT64
formats, the word order is LSW-> MSW.
2.1.1
Geometric representation
According to the signs of the power factor , the active power P and the reactive power Q, it is possible to
obtain a geometric representation of the power vector, as indicated in the drawing below, according to
EN 60253-23:
Fig. 2 : Geometric Representation
2.2
Maximum and minimum electrical values in EM21
The maximum electrical input values are reported in the following table. If the input is above the
maximum value the display shows "----".
AV5 input option
Max value
VL-N
485V
VL-L
840V
A
6,5A
VT
6000
CT
60000
The overflow indication "----" is displayed when the MSB value of the relevant variable is 7FFFh.
EM24-DIN Communication Protocol
2 TABLES
Description
Integer
Unsigned integer
Double integer
Unsigned double int
Unsigned long integer
Single-precision floating-
point
AV6 input option
Min value
Max value
0
150V
0
260V
0
6,5A
1.0
6000
1.0
60000
Bits
16
16
32
32
64
32
a = Exported active power
b = Imported active power
c = Imported reactive power
d = Exported reactive power
Min value
0
0
0
1.0
1.0
Range
-32768 .. 32767
0 .. 65535
31
31
-2
.. 2
32
0 .. 2
-1
64
0 .. 2
-1
-23
127
128
-(1+[1 –2
])x2
.. 2
Table 2.1-1
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