I have gone through all the links but could not find much help regarding my problem. This is not the first PLC I am putting in communication with this S7 -1500 , but there are several S7 -1200 & S7 -300 PLC currently successfully communicating  with this S7 -1500 PLC via UDP communication in my plant.

In fact this s7 - 1200 PLC is the last one , which I have put my hand for commissioning. I have used the same structure and configuration which I had successfully used for all other S7 -1200 PLC but for this one, it is not happening  or occurring.

There is no error. Always receive is busy and status is 7006 .

Nothing comes. Please have a look into the screenshot and suggest further.

I have used same structure and logic for 3 more 1200 PLC , all but this one are successfully running.

hi sarkararnab91,

check the done-bit, like Kaulquappe suggested.

what are you sending and how often are you sending?

regards,

Hello kaulquappe,

Counter value is not moving . But connection is established surely, as in 1500 I am recvng arrays of byte from 1200 . I have also used the same connection db for TSEND_C & TRCV_C in 1200. 

Hello mops04, 

Counter value shows 0 . From 1500 I am sending array of bytes [ size - 128 ] after every high edge of done bit . Please see the attachment.

Hello,

in this case i recommend config AdHoc TRUE and recv len to 65535. Simply I recommend also this option with same recv length every time. Make some tests and check also help how configure AdHoc.

Update: can you pls post screen of UDP connection cfg screen dialog?

Update2: what about also TUSEND/TURCV in case of UDP?

Correction: probably you can't use in case of UDP AdHoc.