Hi gentlemen,

How can I convert 2 "(W#16#0)" in floating point in the S7 300?

I'm reading from modbus TCP, and the other device is sending in the floating point (2 integers).

Thanks a lot.

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Split from integer to real conversion I_R.

Easiest would be in SCL - simply create "array[0..1]of word" and overlay it with "real". Some byte order adjustment may be needed (I have no idea about modbus).

In STL:

L first_word

SLD 16

L second_word

OD

T var_of_type_real

Same story above - some byte order adjustement may be needed.

Mr. jacek d
Mr. Piotr.M

Thank very much by your support.

I'm new in programming with Siemens, if possible could you give me a example?

I need just convert 2 Integers (from Modbus as Folating - Base and Expoent) in one Real

How can I copy "DB13.DBW0 and DB13.DBW 2" (2 Integers) to DB15.DBD0 (Real)?

Many thanks again...
Best Regards.

L DB13.DBW0 (or maybe DBW 2 should go here)

CAW ?

SLD 16

L DB13.DBW 2 (and DBW 0 here ?)

CAW ?

OD

T DB15.DBD0

And as I already stated - no idea about Modbus. So maybe you should first load DBW 0 then DBW 2 or maybe opposite. Or/and maybe you should change byte order with CAW or maybe not.

Hi Friends,

I really Thank for your help, It was very significant to solve my problem.

It's every thing work well now. I did as you said with just one differençe I had to Load the second "Word" first ( as shown below).

The DB13.0 and DB13.2 come from Modbus TCP as a Floating point, but disassembled. And the DB15.DBD0 is the same variable assembleded again.

L     DB13.DBW    2
SLD   16
L     DB13.DBW    0
OD
T     DB15.DBD    0

Many thanks.

Best regards.