CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Uživatelský manuál stáhnout pdf (Strana 7)

Energy management

EM21-DIN Communication Protocol

2 TABLES

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 Description Bits Range

INT16 INT Integer 16 -32768 .. 32767

UINT16 UINT Unsigned integer 16 0 .. 65535

INT32 DINT Double integer 32 -2

.. 2

UINT32 UDINT Unsigned double int 32 0 .. 2

-1

UINT64 ULINT Unsigned long integer 64 0 .. 2

-1

IEEE754 SP Single-precision floating-point

32 -(1+[1 –2

])x2

127

.. 2

128

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

a = Exported active power

b = Imported active power

c = Imported reactive power

d = Exported reactive power

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 “EEE”.

Table 2.1-1

AV5 input option AV6 input option

Max value Min value Max value Min value

VL-N 485V

150V

VL-L 840V

260V

A 6,5A

6,5A

VT 6000

1.0

6000

1.0

CT 60000

1.0

60000

1.0

The overflow indication “EEE“ is displayed when the MSB value of the relevant variable is 7FFFh.

1 2 3 4 5 6 7 8 9 10

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