Measurement Registers (3X and duplicated 3X)

Internally, the M552 3X registers are duplicated in the 4X register area from address 42001, (internal register offset 2000 (07D0h)).
This allows PLCs that canít read floating point data in the 3X area to retrieve the measurements from the 4X area.

The registers are listed below in their Modbus addresses.
The data held at these addresses are Read-Only.
3X registers are read using function 04h.
4X registers are read using function 03h.

A sample read packet using code 4 to access the 3X registers will look like this:-
[Node][04][start address][No. of Double Registers Requested][CRC(2 bytes)]
e.g. To read line to neutral voltages on node 23h:-
[23h][04h][0006h][0006h(3, 4 byte regs)] [CRC(2 bytes)]
The nodeís return packet will look like:-
[23h][04h][0Ch][12 bytes of data = 3 floating point numbers] [CRC(2 bytes)]

A sample read packet using code 3 to access the 4X registers will look like this:-
[Node][03][start address][No. of Double Registers Requested][CRC(2 bytes)]
e.g. To read line to line voltages on node 23h using the duplicated measurements in the 4X area:-
[23h][03h][07D0h][0006h(3, 4 byte regs)] [CRC(2 bytes)]
The nodeís return packet will look like:-
[23h][03h][0Ch][12 bytes of data = 3 floating point numbers] [CRC(2 bytes)]

The list below is the default order of the 3X registers.
The order can be altered using the M
ultiview program, supplied on request or downloaded from our website, or by a suitable SCADA program.

Sample Coding

3X Address

Register

4X Address

Register

Measurement

Order No

?

30001

(0x0000)

42001

(0x07D0)

V L1-2

1

30003

(0x0002)

42003

(0x07D2)

V L2-3

2

30005

(0x0004)

42005

(0x07D4)

V L3-1

3

30007

(0x0006)

42007

(0x07D6)

V 1

4

30009

(0x0008)

42009

(0x07D8)

V 2

5

30011

(0x000A)

42010

(0x07DA)

V 3

6

30013

(0x000C)

42013

(0x07DC)

I 1

7

30015

(0x000E)

42015

(0x07DE)

I 2

8

30017

(0x0010)

42017

(0x07E0)

I 3

9

30019

(0x0012)

42019

(0x07E2)

kW Sum

10

30021

(0x0014)

42021

(0x07E4)

kVA Sum

11

30023

(0x0016)

42023

(0x07E6)

kVAR Sum

12

30025

(0x0018)

42025

(0x07E8)

PF Avg

13

30027

(0x001A)

42027

(0x07EA)

kWHr (Import)

14

30029

(0x001C)

42029

(0x07EC)

kVArHr (Import)

15

30031

(0x001E)

42031

(0x07EE)

Hz

16

30033

(0x0020)

42033

(0x07F0)

kW 1

17

30035

(0x0022)

42035

(0x07F2)

kW 2

18

30037

(0x0024)

42037

(0x07F4)

kW 3

19

30039

(0x0026)

42039

(0x07F6)

kVAr 1

20

30041

(0x0028)

42041

(0x07F8)

kVAr 2

21

30043

(0x002A)

42043

(0x07FA)

kVAr 3

22

30045

(0x002C)

42045

(0x07FC)

kWd (Import)

23

30047

(0x002E)

42047

(0x07FE)

kVAd

24

30049

(0x0030)

42049

(0x0800)

Ad

25

30051

(0x0032)

42051

(0x0802)

Neutral Current

26

30053

(0x0034)

42053

(0x0804)

kVA 1

27

30055

(0x0036)

42055

(0x0806)

kVA 2

28

30057

(0x0038)

42057

(0x0808)

kVA 3

29

30059

(0x003A)

42059

(0x080A)

PF L1

30

30061

(0x003C)

42061

(0x080C)

PF L2

31

30063

(0x003E)

42063

(0x080E)

PF L3

32

30065

(0x0040)

42065

(0x0810)

kWHr (Export)

33

30067

(0x0042)

42067

(0x0812)

kVArHr (Export)

34

30069

(0x0044)

42069

(0x0814)

kVAHr

35

30071

(0x0046)

42071

(0x0816)

AHr

36

30073

(0x0048)

42073

(0x0818)

kWd (Export)

37

30075

(0x004A)

42075

(0x081A)

Max kWd (Import)

38

30077

(0x004C)

42077

(0x081C)

Max kWd (Export)

39

30079

(0x004E)

42079

(0x081E)

Max kVAd

40

30081

(0x0050)

42081

(0x0820)

Max Ad

41

30083

(0x0052)

42083

(0x0822)

Hours Run

42