i have two 315 pn/dp cpu through which i have to exchange data using bsend and brcv blocks. i can successfully transfer byte values through the blocks but i cant transfer real values. there is no error bit and status word stays 0.

is there any other parameters to be changed or anything else ???

attached file is the db and fc call i did.

thankyou

Hi,

if you use BSEND you can use Bool, Byte, Char, Word, Int, Real, Dint, Date, TOD, Time... Datatypes and there is nothing to set. Please check Output Parameter Status at you BSEND instruction.

If Error get true (this could be only for one CPU cycle) save Status (this could be too fast for viewing).

Also check this FAQ;

How do you program communication blocks FB12 "BSEND" and FB13 "BRCV" for data exchange in the S7 program of an S7-300 CPU?

Regards,

Towome