Hallo Everybody ,

I need some help regarding with Siemens LMV51 Burner over AZL5 control unit and Step 7 400.

I want to receive and send Input/ output  Process value from LVM 51. For this I am using modbus communication with S7 400 and using CPU 416-5 H and CP 443-1. I have some function block FB 611,612...FB 640,641,642.

Could you tell me how i send  and receive Input/ output process value via modbus. Example for this reason i need to create new DB block for Input/ out value process value  or  which way i can send and receive for this reason what i should be do, how to read this process value . Im looking forward your good response.