[modbus RS-485 with JAZZ]

Done it ...

I only needed power factor ... (address 10 in klea manual)

In attached file is example that works if anyone needs...

Best regards

maharadza

Modbus Master Jazz RS485.U90

[modbus RS-485 with JAZZ]

Well I got 2 integers 16bit

Example I read voltage on klea 117.3 V

Jazz reads

1st integer:17130

2nd integer:-23276

 

1st integer convert to binary is 0100001011101010

2nd integer covert to binary is 1010010100010100

 

When put togather that is 32bit number

01000010111010101010010100010100

 

First bit is sign,then eight exponent bits and 23 mantisa bits

 

Formula for calculate is here

http://sandbox.mc.edu/~bennet/cs110/flt/ftod.html

and for example above I get 117.32242

 

Now I have to put this formula in ladder ... and it will be dificult ... hope will get solution

[modbus RS-485 with JAZZ]

Is my ladder program ok?

MJ20-RS 485 port A is connected to A of klea device and B of MJ20-RS is connected to B of klea device.

Baud rate od klea device is 19200 and ID of device is 1.

[modbus RS-485 with JAZZ]

Hi maharadza,

MODBUS reads 16 bit registers/tags.

Even if you successfully read 2x16 bit tags in squential MIs, Jazz PLC does not support float point numbers and cannot process it.

It is recommended to use other PLC, which have support of Floating Point numbers.

For example, SAMBA PLC.

 

Please post klea documentation, or link to manufacturer site.

Example you posted have unbelievable for 32 bits Float Point numbers (IEEE 754) high precision of 10 digits.

In accordance to IEEE 754, Single Precision 32 bit Float Point numbers have precision of 7.22 decimal digits.

After mathematical operations precision will be 5-6 decimal digits.

 

What you will do with received Float Point number? Only show on display?

 

B.R.

Hi tnx for fast response.

This is link for klea (klemsan) device.

http://www.klemsan.com.tr/SF/1572/Klea_ENG_27112013.pdf

I need to read PF (power factor) at address 12 for regulation excitacion current of synchronous generator. (Adress 12)

Can I convert float to intergers? Low precision will work also ...

I set ID of klea device to 1 and baud rate 19200.

Can you give me some example for modbus communication that will suit my example ...

I found one example on forum and modified it, but dont works.

MI 10,MI 11,MI 12,MI13 dont receive values from (address 0 in klea device) when press 1 on PLC...

I do something wrong here.

Example is attached

example.U90

[modbus RS-485 with JAZZ]

I need to establish communication betwwen jazz (master) and energy analyzer-klea as slave using RS-485.

Model of jazz is JZ10-11-UA24 with MJ20-RS.

I need to read float value in klea starting addres 0 (Average voltage of three phases)

I am newbie with unitronics and modbus ...

Tnx in advance for any help.

 

In attached files are:

1-klea modbus function

2-data adress in klea

3-example in klea