I think i spent too much time in modbus Communication.Yet to get clear solution. Ok.Am using s7 1212c DC/DC/DC .Am able to do modbus tcp communication with Labview software.Here what i am doing is ,keeping plc as client and labview as server.Am using the same configuration and trying to connect with 3rd party device (ICP CON ET-7052).but what am getting is busy status shows true and STATUS shows 16#0000.Am able to do open tcp communication with the 3rd party device.

But if laview is configured as client (same parameters configured in plc MB_CLIENT) and 3rd party device as server, modbus communication establishes .

The same 3rd party device connects with a application MODSCAN ,Modbus communication establishes.

Here am listing the parameter configuration .

My plc Ip address: 192.168.1.2

Port Id : 502

LABVIEW IP :192.168.1.60

port id :502

3rd party device IP:192.168.1.7

port id : 502

I am attaching Some images and My program for your reference (TIA v11 sp2).Please guide me.

Regards

prasanna

thanks in advance

Am attaching Some images for your references .

Regards

prasanna G.K

I tried plc as client and 3rd party device as server.Busy status acknowledged continously.so i tried the same in labview (labview as client and plc as server ).In this ,first it didn't connected .After giving UNIT ID as1 .The comunication between the labview and 3rd party device established.

In plc side ,where should i enter the UNIT ID ?

regards

prasanna gk

thanks in advance

Thank you sir.Finally am able to communicate my plc with 3rd party device .I changed MB_UNIT ID in MB_CLIENT PARAMETER .Finally it works.

Regards

Prasanna Gk